CN100487818C - Method for analyzing storage capacity of portable storage device - Google Patents

Abstract

A method for analyzing storage capacity of portable storage device is characterized in that the configuration information of storage capacity is divided into several parts, the segments which do not need to be updated are accumulated, and the configuration information is obtained by reading storage media aiming at the segments which need to be updated; another method is characterized in that no updating operation is executed during the timing period of the delay updating period, and when the delay updating period is reached, all the container configuration information influenced by the writing action during the period is updated once; the method is characterized in that the number of the segmented scanning is limited in the updating operation of the batch scanning, if the number of the segmented scanning is limited, the updating operation of the container configuration information is terminated, the segmented updating result is recorded in the controller, and when the updating operation is started next time, the non-updated segment is entered for scanning and updating; the method is characterized in that a special section is arranged in the storage medium to store the statistical result of each section of the container configuration information after the updating is completed each time; when starting, the controller is loaded directly from the storage medium.

Description

Method for analyzing storage capacity of portable storage device

technical field

The invention relates to a method for analyzing volume information of a portable storage device, in particular to a method for analyzing storage capacity of a portable storage device.

Background technique

The portable storage device that can display volume information uses the analysis module of the controller to analyze the storage medium on the device to obtain storage volume related information such as storage volume partition, file system format, available space, volume label name, etc., and then The analyzed information is displayed on the display device, so that the user can view the storage volume information on the portable storage device, so that the user can grasp the use status of the storage volume at any time and improve the convenience of use.

However, when the controller wants to analyze the storage medium, it finds the allocation information (Allocation Information) of the storage medium through the file system identification (File System Identification) and knows the specification of the storage medium (such as: FAT16, FAT32, NTFS and HFS, etc.). The configuration information of the storage medium can be used to grasp the configuration status of the data in the storage medium, and the related information of the capacity can be displayed on the display device after calculation and analysis. When reading and writing data to the storage medium, resulting in changes in the content of the data in the storage medium or its storage address, its configuration information will also be updated in response to these changes, so as to accurately record the configuration locations of all data in the storage medium.

Please refer to FIG. 1 , which is a known configuration information updating control flow chart, which describes reading and writing or accessing data in a storage medium, updating configuration information and volume information, and then displaying the updated volume information on a display device. First, the portable storage device is connected to the application system (computer) to enter the connection state, and the system-side communication protocol is started (step S101 in Figure 1), and then it is judged whether the application system has issued an instruction (step S103 in Figure 1) ), if no instruction is issued, then enter the step of standby state (step S105 in Figure 1), if there is an order issued, then judge whether the instruction is the instruction of read state (step S107 in Figure 1), if The instruction for reading the status is directly executed without triggering to update the scanning configuration information (eg, step S109 in FIG. 1 ), and then returns to step S105. If it is not an instruction to read the state, then judge whether the written instruction affects the configuration information (step S111 in Figure 1), if it does not affect the configuration information, then directly execute the instruction without triggering to update the scanning configuration information (as shown in Figure 1 in step S109), and then return to step S105. If the configuration information will be affected, the capacity information update operation is triggered (step S113 in FIG. 1 ), and then the write operation is performed until the data transmission is completed (step S115 in FIG. 1 ). Since the content volume information of the storage medium has been changed at this time, the updated volume information of the storage medium is read (step S117 in FIG. 1 ). Update the volume information stored in the volume information storage area according to the volume information updated by reading the storage medium (step S119 in Figure 1), and then update the display content of the display device according to the volume information stored in the volume information storage area ( Step S121 in Fig. 1), and finally return to the standby state (step S123 in Fig. 1).

Next, please refer to FIG. 2 , which is a known configuration information update operation program. When the read/write or access of data in the storage medium affects the configuration information, the configuration information update operation is performed (step S201 in FIG. 2 ). Identify the format and analysis method of the file system through File System Identification (as shown in step S203 in Figure 2); obtain the initial address and length of the configuration information, and reset the remaining available space to zero (as shown in Figure 2 Step S205 in 2); read the storage medium to obtain configuration information, and pass the configuration information obtained to the data buffer (as in step S207 in Figure 2); read the data buffer to accumulate the remaining available space (as in Figure 2 Step S209 of step S209); Judging whether to finish scanning (as in step S211 in Fig. 2), if scanning has not yet been completed, accumulatively read address and accumulative scanning length (as in step S213 in Fig. 2); If scanning has been completed, then according to The cumulative result converts the value of the remaining free space capacity to conform to the display format (step S215 in Figure 2); then controls the display device interface to present the latest container information (step S217 in Figure 2); finally completes updating and displaying the container information The operation returns to the standby state (like step S219 in FIG. 2).

Therefore, the work of updating and scanning the content of the configuration information is an important part in the analysis of the capacity information. However, when analyzing the remaining available capacity, especially when the capacity of the storage medium is large and its configuration information space is relatively large, the time for the controller on the portable storage device to scan and update the configuration information is relatively long, and the analysis operation needs to be longer. For a long time, it will affect the general access operation effect of the portable storage device.

Then take FAT32 as an example to explain, when the controller finds the File Allocation Table (File Allocation Table) through file system identification, which records the storage location of the file, the controller can quickly find the data just by referring to the file allocation table. However, when the storage capacity is one billion bytes (1GB), the size of its file allocation table is one million bytes (1MB), and then two billion bytes (2GB). The size of the file configuration table is just two million bytes (2MB). It will take a lot of time for the controller to scan the one-megabyte (1MB) or two-megabyte (2MB) file configuration table, which will affect the effect of the storage operation. Not to mention the storage device with a capacity of more than two gigabytes (2GB), it will take longer to scan the corresponding file configuration table, which will have a greater impact on the storage operation effect.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for analyzing the storage capacity of a portable storage device to improve the access effect.

In order to solve the above-mentioned technical problems, the present invention provides a method for analyzing the storage capacity of a portable storage device. A controller is used to scan a section of configuration information to analyze the capacity of a storage medium. The steps include:

dividing the configuration information section of the storage medium into a plurality of configuration information subsections;

When there is data to be read and written to the storage medium, so that the configuration information sub-section changes, an update signal is set to indicate that the configuration information sub-section has changed;

The controller scans the configuration information section, and reads the configuration information of the configuration information subsection for the configuration information subsection set with the update signal; and

The controller scans the configuration information section, and directly accumulates and calculates the configuration information of the configuration information subsection for which the update signal is not set.

The present invention divides the storage capacity configuration information into several parts; and sets a temporary storage area for the analysis result of the capacity configuration information in a control unit to record the segmented analysis results; when writing the configuration information to the application system, mark the specific mark Segment analysis results must be updated; the system has not written into the segments that do not need to be updated, and the cumulative calculation is performed. Only for the segments with specific marks that need to be updated, the storage medium is read to obtain configuration information, so as to perform statistical calculations and An operation to update segment record information. Therefore, during the calculation period of updating the configuration information of the container twice, only the operation of reading and calculating the updated record is performed for the segment position where the configuration information recorded in the storage medium has been changed, which can greatly reduce the time required for updating the configuration information. Thereby, the purpose of improving the access effect is achieved.

In the method for analyzing the storage capacity of the portable storage device of the present invention, the steps further include:

setting a volume information recording area in a storage medium;

loading volume information from the volume information recording area to a controller when starting up;

When data is written to change configuration information in a configuration information area, the controller scans the configuration information area and updates the volume information; and

Whenever the controller finishes scanning and updates the volume information, it stores the updated information in the volume information recording area.

In the present invention, an exclusive section is set in the storage medium to save and record the statistical results of each section of the volume configuration information. After each update is completed, the storage device controller immediately stores and records the statistical results in the exclusive section; when the storage device is started next time, it can directly The last update result before offline or shutdown is directly loaded into the controller from the storage medium; it eliminates the need to perform a complete scan to update the volume configuration information when restarting.

The present invention also provides a method for analyzing the storage capacity of a portable storage device, the specific steps are as follows:

judging whether a write command of an application system to the portable storage device affects a configuration information table of a storage medium in the portable storage device;

Analyzing the configuration information table corresponding to the written data, and setting a flag signal;

Trigger a delay period and start timing;

When the cycle time of the delay period is reached, update the scanning configuration information table that needs to be updated within the delay period; and

The configuration information table is scanned to update the storage capacity record of the portable storage device.

In the present invention, when the write operation generates the first trigger update, a delayed update cycle timing is started; during the delayed update cycle timing, the update operation is not performed; The container configuration information affected by the action. Since the delay triggering batch processing method is adopted in the triggering process, the frequency of updating the volume configuration information is reduced, and the impact of updating the volume configuration information on the access effect can be reduced.

The present invention further provides a method for analyzing the storage capacity of a portable storage device, the steps comprising:

providing a scan sub-section limit, so that a controller scans a configuration information segment according to the scan sub-section limit;

Load the start address of the configuration information sub-section scan record;

Check whether the configuration information subsection needs to be updated;

If the configuration information subsection needs to be updated, scan the configuration information subsection;

After scanning the configuration information subsection, update the configuration information subsection scanning record;

After updating the scanning record of the configuration information sub-section, it is judged whether the limit of the scanning sub-section has been reached;

If it is judged that the limit of the scanning subsection has been reached, the interrupt operation returns to standby;

If it is judged that the configuration information sub-section does not need to be updated or the limit of the scanning sub-section is not reached, the configuration information of the configuration information sub-section is directly accumulated; and

Check whether the accumulation of all the configuration information subsections has been completed.

In the present invention, in the update operation of batch scan execution, the number of segmented scans is accumulated. If the accumulated number of times reaches a relatively large number, which may affect normal access, the update operation of the volume configuration information is immediately terminated, and the normal access is returned. operation, and because the segment update results have been recorded in the controller, when the update operation is started next time, the updated segments will be accumulated directly, and the unupdated segments will be scanned and updated quickly. The maximum interval for performing the update operation of the volume configuration information can be limited, so as to avoid affecting normal startup or access operations.

Description of drawings

Fig. 1 is a known configuration information update control flow chart;

Fig. 2 is a known operating procedure for updating configuration information;

Fig. 3 is a schematic diagram of segmental scanning of temporarily stored data for volume configuration information in a preferred embodiment of the present invention;

FIG. 4 is a flow chart of a subsection of restricted scan configuration information in a preferred embodiment of the present invention;

FIG. 5A is a schematic diagram of the operation of the volume information recording area in a preferred embodiment of the present invention;

FIG. 5B is a schematic diagram of the operation of the volume information recording area in a preferred embodiment of the present invention;

FIG. 6 is a timing diagram for writing data and triggering updating configuration information in a preferred embodiment of the present invention; and

Fig. 7 is a flow chart of delay trigger configuration information update control in a preferred embodiment of the present invention.

The following is a description of the reference numerals of the main components:

storage media 1

Configuration information section 12

Configuration information subsection 121

Volume information recording area 14

The total capacity of storage media V

The start address S of the configuration information section

The length L of the configuration information section

The number of configuration information subsections M

The length N of the configuration information subsection

Detailed ways

In order to further understand the technology, means and effects that the present invention adopts to achieve the predetermined purpose, please refer to the following detailed description and accompanying drawings of the present invention. In particular, however, the accompanying drawings are only for reference and description, and are not intended to limit the present invention.

The controller of the portable storage device scans the volume configuration information table, so as to grasp the configuration situation in the storage medium. When a system writes data into the storage medium, the configuration information in the storage medium will update the configuration information corresponding to the written data, so that the controller can know the actual configuration in the storage medium after scanning. Please refer to FIG. 3 , which is a schematic diagram of segmental scanning of temporarily stored data of volume configuration information according to a preferred embodiment of the present invention. A storage medium 1 planned with FAT32, wherein the capacity of the storage medium 1 is one gigabyte (1GB), and the size of its configuration information section 12 is one million bytes (1MB), with 2048 sectors (sector).

Firstly, the configuration information section 12 is divided into 100 equal parts configuration information subsections 121, so each configuration information subsection 121 has 20 sectors, yet the capacity of its storage medium 1 is divided into 100 equal parts, Each equalization is ten million bytes (10MB). Therefore, if data within 10MB is written into the storage medium 1, the configuration information section 12 updates a corresponding configuration information subsection 121 to indicate that the corresponding storage medium has changed, and marks the configuration with a flag signal In the information subsection 121, the indication signal is a signal indicating that the analysis result of the volume information of the configuration information subsection 121 needs to be updated. In other words, the configuration information subsection 121 marked with a specific identification signal indicates that the content of the storage medium corresponding to the configuration information subsection 121 has been changed, and the specific identification signal is provided to the controller (not shown). To identify and scan and analyze the updated volume information. For example, if the indication signal of this configuration information subsection 121 is "1", then the corresponding storage medium has changed, and the analysis result of the volume information of this configuration information subsection 121 needs to be updated; if this configuration information subsection If the indication signal of the section 121 is "0", it means that the corresponding storage medium has not changed, and the analysis result of the volume information of the configuration information subsection 121 does not need to be updated. In this way, when the controller calculates the capacity, it can scan and analyze segments according to the segmented configuration information subsection 121, and record the results of the segmented analysis in the capacity configuration information analysis result temporary storage area set in the controller (Fig. not shown). However, when the controller analyzes and counts the configuration status of the volume, the system does not write data to the storage medium 1 and does not need to update the configuration information subsection 121 to accumulate and calculate, but only the configuration information that needs to be updated for a specific indicator signal The subsection 121 reads the storage medium to obtain the configuration information. Therefore, if the data within 10MB is read or written on the storage medium 1, the controller only needs to scan one configuration information subsection 121, that is, 20 sectors, instead of scanning all 2048 sectors from beginning to end.

In addition, the segments of the configuration information segment 12 may also be unequal sub-segments, and the above-mentioned flag signal may also be represented by a flag signal.

Next, the ANSI C language is used as an example to illustrate the average partition method of the storage medium 1. Assuming that the capacity of the storage medium 1 is V (the unit is a magnetic area), after the file system is formatted, its configuration information section (for example: FAT-File Allocation Table ) is located at the starting position S of the storage medium 1, and its configuration information section length is L (the unit is a magnetic area); the configuration information analysis result temporary storage area is set in the controller and the configuration information subsection 121 statistics information can be recorded at most M groups, Then the calculation method of the length N of the configuration information subsection 121 represented by each group of segmented statistical results is:

if((L%M)!=0){

N=INT(L/M)+1;

}else{

N=L/M;

}

However, it should be noted that when L/M is not evenly divisible (L%M!=0), the length of the configuration information subsection 121 represented by the last group of temporary storage areas is:

N_last_entry = L%N;

By means of the above segmentation method, the operations of reading and calculating update records are performed only for the configuration information sub-section 121 where configuration information is changed due to writing data, which can greatly reduce the time required for updating configuration information, thereby improving The purpose of accessing effects.

However, when the portable storage device is turned on, it is necessary to scan the entire configuration information section 12 first, which will affect the booting process and delay the booting time; or when the written data is relatively large, multiple configuration information needs to be scanned. Subsection 121, which may affect the working effect. Therefore, when performing segmented scanning, the number of configuration information subsections 121 scanned by the controller can be limited. When the number of configuration information subsections 121 scanned by the controller reaches the limited number, the scanning will be interrupted and the startup or read/write program will be returned. When the update operation is started next time, since the segment update results have been recorded in the temporary storage area of the controller, the updated segments are accumulated directly, and then quickly enters the sub-section 121 for scanning and updating configuration information that has not been updated, and thus loops to the scanning Update the entire configuration information section or the configuration information subsection 121 that needs to be updated. For example, the number of scans is limited to 10, so every time the controller scans 10 configuration information sub-sections 121, it will record the result in the temporary storage area in the controller, and then return to execute the boot or read/write program, and wait for the next time to start the update operation The updated configuration information subsections 121 are accumulated directly, and the unupdated configuration information subsections 121 are continuously scanned, so as to reduce the influence of scanning configuration information sections on booting and reading and writing operations.

Please refer to Fig. 4, which is a flow chart of limiting scanning of configuration information subsections in a preferred embodiment of the present invention. First, the start address ( As shown in step S401 in Figure 4). Then check the update flag on the configuration information subsection to determine whether the configuration information subsection needs to be updated (step S403 in FIG. 4 ). If update is required, scan the configuration information subsection (step S405 in FIG. 4 ), then update the scanning record of the configuration information subsection and clear the update flag (step S407 in FIG. 4 ). After clearing the update flag, it is judged whether the scan sub-section limit has been reached (step S409 in Figure 4), if the scan sub-section limit has been reached, the scan update operation is interrupted, and the configuration information sub-section update result Store in a temporary storage area in the controller (as in step S411 in FIG. 4 ), and then return to standby (as in step S423 in FIG. 4 ). If the scanning sub-section limit is not reached or the configuration information sub-section does not need to be updated after checking the update flag, the configuration information of the configuration information sub-section is directly accumulated (step S413 in FIG. 4 ). After accumulating the configuration information of the configuration information sub-sections, it is judged whether the accumulation of all the configuration information sub-sections has been completed (step S415 in FIG. 4 ). If the accumulation of all configuration information subsections has not been completed, the scanning address of the configuration information subsection is incremented, and then returns to step S403 to check the update flag of the next configuration information subsection (step S417 in FIG. 4 ). If the accumulation of all configuration information subsections is completed, the controller updates the configuration information and writes it into a storage interval in the storage medium (eg, step S419 in FIG. 4 ). Then drive the display device and update the display of the remaining capacity (step S421 in FIG. 4 ), and then return to standby (step S423 in FIG. 4 ).

By means of the above-mentioned method of limiting the scanning of sub-sections, the maximum period for performing volume configuration information update operations can be limited to avoid affecting normal startup or access operations; because the segment update results have been recorded in the controller, when the update operation is started next time , directly accumulating the updated section, and quickly enter the unupdated section to scan and update.

Please refer to FIG. 5A , which is a schematic diagram of the operation of the volume information recording area in a preferred embodiment of the present invention. The present invention also provides a method to solve the problem that the entire configuration information section 12 must be scanned first when the portable storage device is powered on, which will affect the booting process and delay the booting time. A volume information recording area 14 is set in the storage medium 1 to record the statistical results of the volume configuration information section 12 . When there is data writing to change the configuration information of the configuration information section 12, the controller executes scanning to update the configuration information section 12, and after each scan updates the configuration information section 12, the storage device controller (not shown in the figure) ) then store and record the statistical results in the volume information recording area 14. Please refer to FIG. 5B , which is a schematic diagram of the operation of the volume information recording area in a preferred embodiment of the present invention. When the storage device is started next time, the last updated result can be directly loaded into the temporary storage area of the controller from the volume information recording area 14 before the last offline or shutdown, thereby eliminating the need for a complete scan when restarting It is necessary to update the configuration information section 12 so that the controller can grasp the information configuration and analyze the capacity information of the statistical storage device.

In addition, the configuration information section 12 can also be scanned and updated in the above-mentioned subsection method, that is, a flag signal is set in the section of the changed configuration information section 12. The flag signal can be a flag signal, and the controller According to the marking signal, the records in the configuration information section 12 are scanned and updated, and the volume information of the storage device is analyzed and counted and stored in the volume information recording area 14 .

When an application system writes data to the storage medium to change the configuration information section, a trigger update must be initiated to allow the controller to read the configuration information of the storage medium. However, when the application system rewrites data, it is often limited by the requirements of electrical interface, communication protocol, instruction set, buffer size, and system time-division multiplexing. The continuous interval is divided into multiple writes.

Please refer to FIG. 6, which is a timing diagram of writing data and triggering updating configuration information in a preferred embodiment of the present invention. The system writes a data D1 to the storage medium, and is divided into data d11, data d12, and data d13 by the above-mentioned influence. , data d14, data d15 and data d16 to write. In the past, every time a piece of data is written, the configuration information table will trigger a trigger update (R11, R12, R13, R14, R15 and R16). However, as a result of interrupting or suspending the writing operation for many times and performing the configuration information update operation frequency too high, it is bound to greatly affect the effect of the normal data access operation. In addition, if the time t1 to trigger the update after the data is written is 0.1 seconds, and t2 is 0.2, such a short time update does not seem to make much sense to the user.

Therefore, when the system writes the first data d11 in data D1, it will trigger the first update signal R11 to update the volume information, and after writing the second data d12, it will trigger the second update signal R12 to update the volume information , until the last piece of data d16 of the data D1 is written, the sixth update signal R16 is triggered to update the capacity information. In order to reduce the effect of affecting normal data access operations, some of the update trigger actions can be omitted, and only the update signal triggered by the first written data is used to trigger the delayed scan to start timing. The update signals within a delay period are all The update scan is not performed, and when the update signal triggered by the time of the delay period arrives, the configuration information table changed by writing data before is updated once again.

That is to say, when the first data d11 in the data D1 is written, the update signal R11 is triggered to act. At this time, a delay period T is started, and an update flag is set to indicate that the data d11 is written into the storage medium, and the data The configuration information table corresponding to the storage medium address written in d11 has been changed, and the trigger update signals R11, R12, R13, and R14 within the delay period T do not perform the action of updating the configuration information table, but set An update flag is assigned to the corresponding configuration information table. When the delay period T arrives, the configuration information table will be updated once according to the update signals R11 , R12 , R13 and R14 triggered within the delay period T. When the data d15 is written, the update signal R15 is triggered to act, and an update flag is set in its corresponding configuration information table. After the data d16 is written, the update signal R16 is triggered, and an update flag is set in its corresponding configuration information table. After the data d21 in D2 is written, the update signal R21 is triggered, and an update flag is set in its corresponding configuration information table. However, the trigger update signals R15 , R16 and R21 are all within the delay period T, and when the delay period T arrives, the configuration information table is updated together at one time. Then the writing of data d22 in the data D2 is completed, which triggers the action of the update signal R22 , and the writing of d23 is completed, which triggers the action of the update signal R23 . An update flag is respectively set in its corresponding configuration information table, and when the next delay period T arrives, an update is performed together with the configuration information tables that need to be updated within the delay period. In the same way, continue to execute the subsequent data writing and configuration information table update scanning actions. When the delay period T time arrives, a scan updates the configuration information table that needs to be updated within the delay period T, and finally the controller of the storage device according to the configuration information table scan and analyze the volume information of the storage medium.

Please refer to FIG. 7 , which is a flow chart of delay-triggered configuration information update control in a preferred embodiment of the present invention. First, the portable storage device is connected to an application system, starts the system-side communication protocol and loads the initial record of the configuration information in the storage medium to the controller (step S701 in Figure 7), and checks whether the application system has issued an instruction ( Step S703 in FIG. 7 ), if the application system does not issue an instruction, step S705 is executed, and the portable storage device is placed in a standby state (step S705 in FIG. 7 ). After the standby state, it is necessary to determine whether the update scanning signal has been triggered (step S719 in FIG. 7 ). If the application system has issued an instruction, it is judged whether the instruction is in the state of reading or obtaining (step S707 in Figure 7), if the instruction issued by the application system is in the state of reading or obtaining, then the instruction is directly executed without updating scan Configure the information area (as shown in step S709 in Figure 7), and then return to step S705. If the command issued by the application system is not to read or obtain the state, it is judged whether the command written by the application system changes the configuration information area (step S711 in FIG. 7 ). If the command written by the application system does not affect the configuration information area, return to step S709. If the command written by the application system changes the configuration information area, analyze the written position and set an update flag (step S713 in FIG. 7 ). Next, a write operation is performed to complete data transmission (eg, step S714 in FIG. 7 ). Then determine whether the timing of the delayed update cycle has been triggered (step S715 in FIG. 7), if the timing of the delayed update cycle has not been triggered, then the timing of the delayed update cycle is triggered (step S717 in FIG. 7). After the operation is completed, it is judged whether the update scanning signal has been triggered (step S719 in FIG. 7). If the update scanning signal is not triggered, return to step S703. If the update scan signal is triggered, it is determined whether the delayed update period has arrived (step S721 in FIG. 7 ). If the delayed update period has not been reached, return to step S703, and continuously check whether the update period has been reached in the standby state. If the delay update period has been reached, the configuration information area is scanned in segments according to the update flag, and the update accumulation operation is recorded (step S723 in FIG. 7 ). Then judge whether to interrupt the scan (step S725 in FIG. 7 ), which can be judged according to whether the limit of segmented scan has been reached. If the scan is interrupted, return to step S703, check whether an instruction from the application system is received, and execute it preferentially. If the interrupt scan is not performed, the display content of the configuration information is updated (step S727 in FIG. 7).

However, the above description is only a detailed description and accompanying drawings of preferred specific embodiments of the present invention, and the features of the present invention are not limited thereto, and are not intended to limit the present invention. All scope of the present invention should be defined by its rights Requirements prevail, and all embodiments that conform to the spirit of the claims of the present invention and similar changes thereof shall be included in the scope of the present invention, and any changes or modifications that can be easily conceived by those skilled in the art in the field of the present invention All can fall within the scope of the claims of the present invention.

Claims (23)

1. A method for analyzing the storage capacity of a portable storage device, characterized in that, utilizing a controller to scan a configuration information segment to analyze the capacity of a storage medium, the steps comprising: dividing the configuration information section of the storage medium into a plurality of configuration information subsections; When there is data to be read and written to the storage medium, so that the configuration information sub-section changes, an update signal is set to indicate that the configuration information sub-section has changed; The controller scans the configuration information section, and reads the configuration information of the configuration information subsection for the configuration information subsection set with the update signal; and The controller scans the configuration information section, and directly accumulates and calculates the configuration information of the configuration information subsection for which the update signal is not set. 2. The method for analyzing the storage capacity of a portable storage device as claimed in claim 1, wherein the configuration information subsections are sections of equal length to each other. 3. The method for analyzing storage capacity of a portable storage device as claimed in claim 1, wherein the configuration information subsections are sections with different lengths. 4. The method for analyzing storage capacity of a portable storage device as claimed in claim 1, wherein the update signal can be represented by a flag signal. 5. The method for analyzing the storage capacity of a portable storage device as claimed in claim 1, wherein the controller stores the configuration information analysis result of scanning the configuration information sub-section in a temporary storage area in the controller Inside. 6. The method for analyzing the storage capacity of a portable storage device as claimed in claim 1, wherein the steps further comprise: setting a volume information recording area in a storage medium; loading volume information from the volume information recording area to a controller when starting up; When data is written to change configuration information in a configuration information area, the controller scans the configuration information area and updates the volume information; and Whenever the controller finishes scanning and updates the volume information, it stores the updated information in the volume information recording area. 7. A method for analyzing the storage capacity of a portable storage device, characterized in that the steps include: providing a scan sub-section limit, so that a controller scans a configuration information segment according to the scan sub-section limit; Load the start address of the configuration information sub-section scan record; Check whether the configuration information subsection needs to be updated; If the configuration information subsection needs to be updated, scan the configuration information subsection; After scanning the configuration information subsection, update the configuration information subsection scanning record; After updating the scanning record of the configuration information sub-section, it is judged whether the limit of the scanning sub-section has been reached; If it is judged that the limit of the scanning subsection has been reached, the interrupt operation returns to standby; If it is judged that the configuration information sub-section does not need to be updated or the limit of the scanning sub-section is not reached, the configuration information of the configuration information sub-section is directly accumulated; and Check whether the accumulation of all the configuration information subsections has been completed. 8. The method for analyzing the storage capacity of a portable storage device as claimed in claim 7, wherein if the accumulation of all the configuration information subsections has not been completed, the scanning address of the configuration information subsections is progressively advanced, and the progress is checked. Whether the configuration information subsection of the config needs to be updated. 9. The method for analyzing the storage capacity of a portable storage device as claimed in claim 7, wherein if the accumulation of all subsections of the configuration information has been completed, the configuration information is updated and written into a temporary memory of the controller in the district. 10. The method for analyzing the storage capacity of a portable storage device as claimed in claim 7, wherein after the configuration information is updated and written into the temporary storage area, a display device is driven to update the display of the remaining capacity. 11. The method for analyzing storage capacity of a portable storage device as claimed in claim 7, wherein the configuration information sub-section scan record start address is loaded from a temporary storage area in the controller. 12 . The method for analyzing storage capacity of a portable storage device as claimed in claim 7 , wherein the scan sub-section is segmented by the scan section. 13 . 13. The method for analyzing the storage capacity of a portable storage device as claimed in claim 7, wherein the limit of scanning subsections is a limit set for the controller to scan the number of configuration information subsections. 14. The method for analyzing storage capacity of a portable storage device as claimed in claim 7, wherein the configuration information subsections are sections of equal length to each other. 15. The method for analyzing the storage capacity of a portable storage device as claimed in claim 7, wherein the configuration information subsections are sections with different lengths. 16. The method for analyzing storage capacity of a portable storage device as claimed in claim 7, wherein checking whether the configuration information sub-section needs to be updated can be judged by setting an update flag signal. 17. The method for analyzing storage capacity of a portable storage device as claimed in claim 16, wherein the update flag signal is set when the configuration information subsection changes. 18. A method for analyzing the storage capacity of a portable storage device, characterized in that the steps include: judging whether a write command of an application system to the portable storage device affects a configuration information table of a storage medium in the portable storage device; Analyzing the configuration information table corresponding to the written data, and setting a flag signal; Trigger a delay period to start timing; When the cycle time of the delay period is reached, update the scanning configuration information table that needs to be updated within the delay period; and The configuration information table is scanned to update the storage capacity record of the portable storage device. 19. The method for analyzing storage capacity of a portable storage device as claimed in claim 18, wherein the indication signal is a flag signal. 20. The method for analyzing the storage capacity of a portable storage device according to claim 18, characterized in that when the application system finishes writing the first data in the storage medium and changes the configuration information table, it triggers A delay period starts counting. 21. The method for analyzing the storage capacity of a portable storage device as claimed in claim 18, wherein the data written in the delay period does not update the configuration information until the delay period expires, and then the The contents of the configuration information table that have changed due to data writing within the delay period are updated once. 22. The method for analyzing the storage capacity of a portable storage device as claimed in claim 18, wherein a controller is used to read and analyze the configuration information table according to the indication signal to update the storage capacity of the portable storage device Record. 23. The method for analyzing the storage capacity of a portable storage device as claimed in claim 22, wherein the record of the storage capacity of the portable storage device is stored in a temporary storage area in the controller.

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