CN116048630A - Method for accessing hidden area data, electronic equipment and storage medium - Google Patents

Abstract

The application discloses a method for accessing data in a hidden area, electronic equipment and a storage medium. The method includes: issuing an instruction to the first type of hard disk according to the first program to adjust the hidden area to a visible state; disconnecting the hidden area according to the obtained device number The hard disk of the first type reloads the device connected to the electronic device to change the state of the logical block address of the hard disk of the first type so that the visible state of the hidden area takes effect; according to the second program, adjust the The partition table of the logical block address corresponding to the hidden area; reconnect the device connected to the electronic device, and reconnect the partition of the first type of hard disk according to the adjusted partition table to determine the location of the hidden area . The present invention realizes correct access or update of data in the hidden area by quickly setting the attribute of the hidden area and adjusting the corresponding partition table, and efficiently and accurately uses the hidden area of the SSD firmware layer.

Description

A method, electronic device and storage medium for accessing hidden area data

technical field

The present application relates to the field of data processing, in particular to a method for accessing data in a hidden area, electronic equipment and a storage medium.

Background technique

On the solid-state hard disk, the function of hiding part of the logical block address is realized through a method similar to HD's HPA, thereby forming a hidden area on the solid-state hard disk. The hidden area is invisible to general-purpose BIOS and OS and other upper-layer software, which realizes the purpose of hiding and protecting data and prevents data from being illegally accessed or lost.

In order to maximize the value of the hidden area on the solid state drive, a file system is created in the hidden area on the solid state drive, which can expand the use of the hidden area: this part of the storage space can be used as a backup of the user's important data, or installed Some special applications can even be a lightweight operating system within this hidden area. Then, it is particularly important to quickly access and update the data deployed in the hidden area or how the system is automated.

In the existing solutions, the following methods are adopted: start a local operating system or a livecd system; set hidden and visible through the hidden related instructions of the solid-state hard disk based on the NVMe protocol; revise the partition table containing the hidden area, access or Update hidden area data.

The disadvantage of this solution is that it needs to start other systems, execute relevant instructions and steps in a single step, the probability of error is high, and it cannot be completed automatically.

Contents of the invention

In view of the above problems, the embodiment of the present application discloses a method, electronic device and storage medium for accessing hidden area data, so as to realize rapid setting of hidden area attributes, adjustment of corresponding partition table, correct access or update of hidden area data, and efficient and accurate use hidden area.

One of the purposes of the embodiments of the present application is to provide a method for accessing hidden area data, which is applied to electronic devices, and is characterized in that it includes:

Sending instructions to the first type of hard disk according to the first program to adjust the hidden area to a visible state;

Disconnecting the hard disk of the first type according to the obtained device number, reloading the device connected to the electronic device, so as to change the state of the logical block address of the hard disk of the first type, so that the visible state of the hidden area takes effect;

According to the second program, adjusting the partition table of the logical block address corresponding to the hidden area;

Reconnecting the device connected to the electronic device, and reconnecting the partition of the first type of hard disk according to the adjusted partition table, so as to determine the location of the hidden area;

An access request to the hidden area is received, and all partitions and file systems are remapped according to the type of the access request, so as to access the hidden area.

As an optional embodiment, the disconnecting the hard disk of the first type according to the obtained device number includes:

Start the third program to obtain the device number of the first type of hard disk in the first environment.

As an optional embodiment, the starting the third program includes:

receiving a startup command sent from the operating system on the electronic device;

Or, receive the startup command sent from the startup file in the external storage device.

As an optional embodiment, the method also includes:

Before receiving the access request, confirm whether the electronic device is equipped with a second-type hard disk in the first environment;

If yes, then remove the second type of hard disk.

As an optional embodiment, the method also includes:

When the access request is for data upgrade or program upgrade, obtain the device quantity of the external storage device connected to the electronic device in the first environment;

The number of devices is compared with a preset threshold, and corresponding operations are performed according to the comparison result.

As an optional embodiment, the performing corresponding operations according to the comparison result includes:

When the number of devices is within the range of the preset threshold, all partitions and file systems are remapped under the first environment.

As an optional embodiment, the performing corresponding operations according to the comparison result includes:

When the number of devices is not within the range of the preset threshold, according to the received operation instruction, the running of the first program is terminated.

As an optional embodiment, the method also includes:

When the access request is data access or program startup, disconnect the external storage device connected to the electronic device under the first environment.

One of the purposes of the embodiments of the present application is to provide an electronic device, including:

The first adjustment module is configured to issue an instruction to the first type of hard disk according to the first program to adjust the hidden area to a visible state;

The first reloading module is used to disconnect the first-type hard disk according to the device number, and reload the device connected to the electronic device to change the state of the logical block address of the first-type hard disk, so that The visible state of the hidden area takes effect;

A second adjustment module, configured to adjust the partition table of the logical block address corresponding to the hidden area according to the second program;

The second overload module is used to reconnect the device connected to the electronic device, and reconnect the partition of the first type of hard disk according to the adjusted partition table to determine the location of the hidden area;

The receiving module is configured to receive an access request to the hidden area, and remap all partitions and file systems according to the type of the access request, so as to access the hidden area.

One of the purposes of the embodiments of the present application is to provide a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, each step in the aforementioned method for accessing data in a hidden area is implemented .

The beneficial effects of the embodiments of the present application are:

The present invention realizes correct access or update of data in the hidden area by quickly setting the attribute of the hidden area and adjusting the corresponding partition table, and efficiently and accurately uses the hidden area of the SSD firmware layer. Implemented using the standard UEFI EDK2 architecture, supports multi-architecture cross-compilation execution, avoids multiple developments, and has high consistency.

After booting, the BIOS can automatically boot and start. At the same time, it supports manual execution in the UEFI Shell environment, and also supports startup and execution in grub; the whole process is fully automated, improving efficiency, ensuring quality, and high consistency of execution results.

Description of drawings

Fig. 1 is the flowchart of the embodiment method of the present application;

FIG. 2 is a frame diagram of an electronic device according to an embodiment of the present application;

Figure 3 is a schematic diagram of the prior art;

Figure 4 is a schematic diagram of the prior art II;

FIG. 5 is a structure diagram of a directory for storing required files in the embodiment of the present application.

Detailed ways

Various aspects and features of the present application are described herein with reference to the accompanying drawings.

It should be understood that various modifications may be made to the embodiments applied for herein. Accordingly, the above description should not be viewed as limiting, but only as exemplifications of embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the application.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with the general description of the application given above and the detailed description of the embodiments given below, serve to explain the embodiments of the application. principle.

These and other characteristics of the present application will become apparent from the following description of preferred forms of embodiment given as non-limiting examples with reference to the accompanying drawings.

It should also be understood that, while the application has been described with reference to a few specific examples, those skilled in the art will be able to implement certain other equivalents of the application.

The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

Specific embodiments of the present application are hereinafter described with reference to the accompanying drawings; however, it should be understood that the applied embodiments are merely examples of the present application, which can be implemented in various ways. Well-known and/or repetitive functions and constructions are not described in detail to avoid obscuring the application with unnecessary or redundant detail. Therefore, specific structural and functional details disclosed herein are not intended to be limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any suitable detailed structure. Apply.

This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may refer to the same or one or more of the different embodiments.

Usually, the layout of the traditional hidden area is shown in Figure 3. The EFI system partition can be viewed in the disk manager of the Windows system or the DiskGenius tool of the Livecd system, so that the partition can be deleted, formatted, hidden, and unhidden. .

On the solid-state hard disk, the function of hiding part of the logical block address can be realized through a method similar to HD's HPA, thus forming a hidden area on the solid-state hard disk. The hidden area of the solid state drive cannot be viewed by default in the system, so it cannot be accessed or destroyed.

The general automatic deployment method can only be installed on the traditional full disk. For the solid-state hard disk with a hidden area set for initialization, as shown in Figure 4, the operating system can only be installed in the visible state of the solid-state hard disk area (the solid line part), and cannot be accessed. Go to the hidden area of the SSD (dotted line).

This is because the NVME firmware program will not report the logical block address initialized as part of the hidden area, and this part of the area will not be seen in the BIOS or OS.

Based on the above, one of the purposes of the embodiments of the present application is to provide a method for accessing hidden area data, which is applied to electronic devices, including:

According to the first program, an instruction is sent to the hard disk of the first type to adjust the hidden area to a visible state. The first type of hard disk is NVME SSD. The first program is used under the UEFI Shell environment.

Specifically, execute NVMeOpen.efi (the first program), the first program is a UEFI auxiliary program, and issues instructions to the NVME SSD to identify whether the hidden area exists, and set the hidden area as a visible state according to the inspection result.

In order to make the hard disk attributes of the first type set in the UEFI environment take effect, it is necessary to disconnect the hard disk of the first type according to the obtained device number, and reload the device connected to the electronic device to change the logic of the hard disk of the first type The state of the block address (hereinafter referred to as the logical block address by LBA) makes the visible state of the hidden area take effect.

Specifically, since there is no device number corresponding to the NVME SSD in the UEFI environment at this time, all devices can only be reconnected here. After reconnecting, NVME SSD will set the LBA of all disks to be visible and accessible.

In order to achieve the efficiency of this method, disconnecting the NVME SSD first, instead of restarting the electronic device or disconnecting all devices, can save operating cycles and reduce the risk of disconnecting redundant devices.

As an optional embodiment, the disconnecting the first-type hard disk according to the obtained device number includes: starting a third program to obtain the device number of the first-type hard disk in the first environment. Described first environment is UEFI Shell environment.

Specifically, when the third program is started, the required environment parameters under the UEFI Shell are initialized. When the method is used, the third program is first started to initialize the use environment of the electronic device, and then the corresponding steps are completed through the first program and the second program.

Since the number and types of peripheral devices on electronic devices are different, the enumeration order and assigned numbers of all devices in the running BIOS program are different, so a third program is required to dynamically query the NVME SSD devices in the current UEFI Shell environment serial number. This method supports enumeration methods for device sequences and numbers in different BIOS implementations.

As an optional embodiment, the starting the third program includes: receiving a startup instruction sent from an operating system on the electronic device; or receiving a startup instruction sent from a startup file in an external storage device.

Among them, starting the third program can be executed through the command line in the UEFI Shell environment, or can be independently packaged into an ISO image, and the ISO image can be copied to an external storage device, such as a USB flash drive, which can be automatically started by booting the USB flash drive. . The required file storage directory structure in the U disk is shown in Figure 5.

The specific steps of the second startup method are as follows:

a) Rename the third program as bootx64.efi according to the BIOS UEFI mode startup rules;

b) Store and replace the renamed bootx64.efi file into the directory specified by the rule;

c) Use ISO packaging tools or commands to package into an ISO image;

d) Use the encapsulated ISO image to make a bootable U disk;

e) Connect the U disk to the electronic device, and select the U disk to start the electronic device;

f) The third program can be started and executed by the BIOS as a startup file of a common operating system.

For example, when the electronic device is computing, Zhaoxin (C86), Haiguang (C86), Loongson (mips), Loongson (loongarch64), Phytium (ARM), Intel, AMD multi-CPU platforms are supported. The process of starting the third program is:

Start the computer, press F1 or delete to enter the BIOS environment, check and confirm that the boot mode is UEFI or UEFI priority;

Start the UEFI Shell environment, and then manually execute the third program through the command line or make a boot U disk to automatically execute the third program;

The third program starts, and initializes the required environment parameters under UEFI Shell, so that the subsequent steps can be operated in this environment.

According to the second program, the partition table of the logical block address corresponding to the hidden area is adjusted. Specifically, execute NVMeGPT.efi (the second program), the second program is a UEFI auxiliary program, and adjust the visible LBA in the hidden area to have partition table information.

Reconnecting the device connected to the electronic device, and reconnecting the partitions of the first type of hard disk according to the adjusted partition table, so as to determine the location of the hidden area. Specifically, reconnect all devices in the UEFI environment, and then reconnect each partition according to the partition table of the new NVME SSD disk capacity.

An access request to the hidden area is received, and all partitions and file systems are remapped according to the type of the access request, so as to access the hidden area.

Specifically, all partitions and file systems are remapped in the UEFI environment, and the partition identifier fs* of the UEFI Shell environment is recreated. Complete the established functions of the third program, such as data access in the hidden area, program startup, data or program update, etc.; end the third program, exit the UEFI environment and restart.

As an optional embodiment, the method further includes: when the access request is data upgrade or program upgrade, acquiring the device quantity of the external storage device connected to the electronic device in the first environment. The external storage device includes at least one of the following: U disk, mobile hard disk or other types of mobile storage media.

Check how many external storage devices are connected to the electronic device at this time, compare the number of devices with a preset threshold, and perform corresponding operations according to the comparison result.

As an optional embodiment, the performing corresponding operations according to the comparison result includes: remapping all partitions and file systems in the first environment when the number of devices is within the range of the preset threshold.

Specifically, the preset threshold is set to 1, and if only the working external storage device of the method program is externally connected, that is, the number of external storage devices is 1, and the threshold range requirement is met, then proceed to the next step.

As an optional embodiment, the performing the corresponding operation according to the comparison result includes: when the number of devices is not within the range of the preset threshold, ending the operation of the first program according to the received operation instruction .

Specifically, if the number of external storage devices connected is more than one (the U disk stored in the program of this method), that is, the number of devices is not within the threshold range. The operation instructions received at this time include an instruction to report the device quantity of the external storage device, an instruction to prompt removal of more than USB storage devices, and an instruction to end the third program.

As an optional embodiment, the method further includes: disconnecting the external storage device connected to the electronic device under the first environment when the access request is data access or program startup.

As an optional embodiment, the method further includes: before receiving the access request, confirming whether the electronic device is installed with a second-type hard disk in the first environment; remove. The second type of hard disk is SSD or HDD of other SATA interface types.

Specifically, when the electronic device is a computer, since each partition in the UEFI environment is expressed in the form of fs*, its order is very dependent on the design of the computer motherboard, the wiring of peripheral devices on the motherboard, the sequence of devices enumerated by the BIOS, etc. Uncertainties.

In order to prepare for accessing the hidden area of NVME SSD, the method adopted in this method is to unload specific redundant storage devices according to the functional requirements of the program. That is, first confirm whether there are SSDs or HDDs of other SATA interface types, and if so, uninstall this device.

This method runs through the UEFI Shell environment and is developed and implemented based on UEFI EDK2. It can complete the BIOS automatic booting and starting after the computer is turned on.

When the applied electronic device is a computer, as shown in Figure 1, the specific automation process steps are as follows:

1) Turn on the electronic device, press the F1 or delete key to enter the BIOS environment, check and confirm that the boot mode is UEFI or UEFI priority.

2) Start the UEFI Shell environment, and execute the method program (ie the third program) according to the received startup command.

3) The third program starts to initialize the required environment parameters under UEFI Shell.

4) Since the number and types of peripheral devices on the computer motherboard are different, the enumeration order and assigned numbers of all devices in the running BIOS program are different, so it is necessary to dynamically query the NVME in the UEFIShell environment of the current computer in this method program. The device number of the SSD.

5) Execute NVMeOpen.efi, the first program is the UEFI auxiliary program, which sends instructions to the NVME SSD firmware to identify whether the hidden area exists, and sets the hidden area of the SSD to a visible state according to the inspection result.

6) The SSD attributes that need to be set in the UEFI environment take effect, and the NVME SSD needs to be disconnected according to the device number obtained in step 4). In order to achieve the efficiency of this method, disconnecting the NVME SSD device instead of restarting the computer or disconnecting all devices can save operating cycles and reduce the risk of disconnecting redundant devices.

7) Since there is no NVME SSD device number in the UEFI environment at this time, all devices can only be reconnected here. At this time, the NVME SSD firmware will set the LBA of all disks to be visible and accessible.

8) Execute the second UEFI auxiliary program NVMeGPT.efi, and adjust the NVME SSD firmware to set the visible LBA in the hidden area to have partition table information.

9) Reconnect all devices in the UEFI environment. At this time, each partition will be reconnected according to the partition table of the new full disk capacity in step 8).

10) Since each partition in the UEFI environment is represented by fs*, its order is very dependent on various uncertain factors such as the design of the computer motherboard, the wiring of peripheral devices on the motherboard, and the sequence of devices enumerated by the BIOS.

In order to prepare for accessing the hidden area of NVME SSD, the method adopted in this method is to unload specific redundant storage devices according to the functional requirements of the program. First confirm whether there is an SSD or HDD with other SATA interface types, and if so, uninstall this device.

11) If performing the data upgrade or software upgrade function in the hidden area, check how many external storage devices are connected to the computer at this time;

12) If the number of external devices connected is more than one (U disk stored in this method program), report the number of external storage devices, and prompt to remove more external storage devices, and end the third program.

13) If only the working external storage device of the method program is externally connected, proceed to subsequent step 15).

14) Continue to step 11): If performing data access or program upgrade in the hidden area, disconnect all external storage devices;

15) Remap all partitions and file systems in the UEFI environment, and recreate the partition identifier fs* of the UEFI Shell environment;

16) Complete the established functions of the program of this method, such as data access in the hidden area, program startup and execution, data or program software update, etc.;

17) End the program, exit the UEFI environment and restart.

One of the purposes of the embodiments of the present application is to provide an electronic device, as shown in FIG. 2 , including:

The first adjustment module is configured to issue an instruction to the first type of hard disk according to the first program to adjust the hidden area to a visible state. It also includes a third obtaining module, which is used to start a third program to obtain the device number of the first type of hard disk in the first environment.

The first reloading module is used to disconnect the first-type hard disk according to the device number, and reload the device connected to the electronic device to change the state of the logical block address of the first-type hard disk, so that The visible state of the hidden area takes effect.

The second adjustment module is configured to adjust the partition table of the logical block address corresponding to the hidden area according to the second program.

The second reloading module is used to reconnect the device connected to the electronic device, and reconnect the partition of the first type of hard disk according to the adjusted partition table to determine the location of the hidden area.

The receiving module is configured to receive an access request to the hidden area, and remap all partitions and file systems according to the type of the access request, so as to access the hidden area.

The electronic device also includes: a first acquisition module, configured to confirm whether the electronic device has a second-type hard disk installed in the first environment before receiving the access request; Hard drive removed.

The electronic equipment also includes:

The second obtaining module is used to obtain the device quantity of the external storage device connected to the electronic device in the first environment when the access request is a data upgrade or program upgrade; the comparison module is used to compare the device quantity Compare with the preset threshold, and perform corresponding operations according to the comparison result.

The electronic device may be a micro or small computer such as a desktop computer (PC), a notebook computer, a tablet computer, or a mobile phone, or may be a large computer such as a server or an industrial computer.

One of the purposes of the embodiments of the present application is to provide a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, each step in the aforementioned method for accessing data in a hidden area is implemented .

The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements shall also be deemed to fall within the protection scope of the present application.

Claims (10)

1. A method for accessing hidden area data, applied to electronic equipment, characterized in that, comprising: Sending instructions to the first type of hard disk according to the first program to adjust the hidden area to a visible state; Disconnecting the hard disk of the first type according to the obtained device number, reloading the device connected to the electronic device, so as to change the state of the logical block address of the hard disk of the first type, so that the visible state of the hidden area takes effect; According to the second program, adjusting the partition table of the logical block address corresponding to the hidden area; Reconnecting the device connected to the electronic device, and reconnecting the partition of the first type of hard disk according to the adjusted partition table, so as to determine the location of the hidden area; An access request to the hidden area is received, and all partitions and file systems are remapped according to the type of the access request, so as to access the hidden area. 2. The method according to claim 1, wherein said disconnecting said first-type hard disk according to the obtained device number comprises: Start the third program to obtain the device number of the first type of hard disk in the first environment. 3. The method according to claim 2, wherein said starting a third program comprises: receiving a startup command sent from the operating system on the electronic device; Or, receive the startup command sent from the startup file in the external storage device. 4. The method according to claim 1, wherein the method further comprises: Before receiving the access request, confirm whether the electronic device is equipped with a second-type hard disk in the first environment; If yes, then remove the second type of hard disk. 5. The method according to claim 1, wherein the method further comprises: When the access request is for data upgrade or program upgrade, obtain the device quantity of the external storage device connected to the electronic device in the first environment; The number of devices is compared with a preset threshold, and corresponding operations are performed according to the comparison result. 6. The method according to claim 5, wherein said performing corresponding operations according to the comparison result comprises: When the number of devices is within the range of the preset threshold, all partitions and file systems are remapped under the first environment. 7. The method according to claim 5, wherein said performing corresponding operations according to the comparison result comprises: When the number of devices is not within the range of the preset threshold, according to the received operation instruction, the running of the first program is terminated. 8. The method according to claim 1, further comprising: When the access request is data access or program startup, disconnect the external storage device connected to the electronic device under the first environment. 9. An electronic device, characterized in that it comprises: The first adjustment module is configured to issue an instruction to the first type of hard disk according to the first program to adjust the hidden area to a visible state; The first reloading module is used to disconnect the first-type hard disk according to the device number, and reload the device connected to the electronic device to change the state of the logical block address of the first-type hard disk, so that The visible state of the hidden area takes effect; A second adjustment module, configured to adjust the partition table of the logical block address corresponding to the hidden area according to the second program; The second overload module is used to reconnect the device connected to the electronic device, and reconnect the partition of the first type of hard disk according to the adjusted partition table to determine the location of the hidden area; The receiving module is configured to receive an access request to the hidden area, and remap all partitions and file systems according to the type of the access request, so as to access the hidden area. 10. A computer-readable storage medium on which a computer program is stored, wherein when the computer program is executed by a processor, the method for accessing data in a hidden area according to any one of claims 1-8 is implemented. steps in the method.

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