TWI644204B - Method for partitioning memory area of non-volatile memory - Google Patents

Abstract

A non-volatile memory magnetic zone planning method includes the following steps. Moving all the original data of a removable memory device to a backup space outside the removable memory device; performing magnetic zone planning on a storage space of the removable memory device; and, after completing the storage After the space is planned for the magnetic zone, all the original data in the backup space is moved back into the storage space.

Description

Non-volatile memory magnetic zone planning method

The invention relates to a magnetic zone planning method, in particular to a magnetic zone planning method of non-volatile memory.

In general, because the Universal Serial Bus (USB) removable memory meets the requirements of data storage and handling, USB removable memory is becoming a convenient tool for data access. In order to prevent all files in the USB removable memory from being viewed when borrowing others, the confidential file can be placed in an encryption area of the USB removable memory to reduce the chance of the confidential file being stolen.

However, when the encryption area is set on the USB removable memory, all the original data in the USB removable memory will be lost, thereby reducing the user's willingness to use.

Therefore, how to develop a solution to improve the above-mentioned lacks and inconveniences is an important issue that the relevant industry is currently unable to delay.

One embodiment of the present invention provides a non-volatile memory magnetic zone planning method, including the following steps. Moving all the original data of a removable memory device to a backup space outside the removable memory device; performing magnetic zone planning on a storage space of the removable memory device; and completing the storage space After the magnetic zone planning, all the original data in the backup space is moved back into the storage space.

In one or more embodiments of the present invention, prior to the step of magnetic zone planning of the storage space, the removable memory device has an encryption zone and an unencrypted zone. The capacity of the encryption zone has a capacity ratio to the capacity of the non-encrypted zone. Whenever a request to change the capacity ratio is received, it is judged whether the size of the original data is not greater than the capacity of the non-encrypted area in the changed capacity ratio.

In one or more embodiments of the present invention, the step of performing magnetic zone planning on the storage space further includes the following steps. The encrypted area and the non-encrypted area of the removable memory device are re-adjusted according to the changed capacity ratio.

In one or more embodiments of the present invention, the step of performing magnetic zone planning on the storage space further includes the following steps. The storage space is divided into an encryption area and an unencrypted area, and the encryption area can only be opened by a key password.

In one or more embodiments of the present invention, the step of moving all the original data in the backup space back into the storage space further includes the following steps. Move the original data in the backup space to the encrypted area and the non-encrypted area.

In one or more embodiments of the present invention, the steps of magnetic zone planning for the storage space further include the following steps. Determining whether the size of the original data is not greater than the capacity of the backup space; when judging that the size of the original data is not greater than the capacity of the backup space, determining whether the size of the original data is not greater than the capacity of the non-encrypted area; When the size of the data is not greater than the capacity of the non-encrypted area, all the original data is moved to the backup space.

In one or more embodiments of the present invention, before the step of moving the original data to the backup space, the original data in the backup space is encrypted. Before the steps of moving the original data back into the storage space, the original data in the backup space is decrypted to obtain the original data.

In one or more embodiments of the present invention, the steps are further included as follows after the step of completely moving the original data to the backup space. Hide the access path of the backup space.

In one or more embodiments of the present invention, the steps of magnetic zone planning for the storage space include the following steps. The storage space is planned to be an encrypted area or an unencrypted area, and the encrypted area can only be opened by a key password.

In one or more embodiments of the present invention, the storage space has at least one original encryption area before the step of moving the original data to the backup space. The original encryption area can only be opened with a key password.

Another embodiment of the present invention provides a non-volatile memory magnetic zone planning method, including the following steps. A removable memory device is coupled to a computer device. The removable memory device has a first encryption area and a first non-encrypted area, and the capacity of the first encryption area has a first capacity ratio to the capacity of the first non-encrypted area. Whenever a requirement to change the first capacity ratio to a second capacity ratio is received, all of the first data in the first non-encrypted area is moved to a first backup space in the computer device, and the first encryption One of the second data in the area is all moved to a second backup space in the computer device. The removable memory device is re-adjusted according to the second capacity ratio, so that the removable memory device is divided into a second encrypted area and a second unencrypted area. All the first data in the first backup space is moved to the second non-encrypted area, and the second data in the second backup space is all moved to the second encrypted area.

In one or more embodiments of the invention, the steps are further included as follows when a request is received. Determining whether the size of the first data is not greater than the capacity of the second unencrypted area; and when determining that the size of the first data is not greater than the capacity of the second unencrypted area, moving the first data to the first backup space.

In one or more embodiments of the present invention, each time a request is received, the steps are further included as follows. Determining whether the size of the second data is not greater than the capacity of the second encryption area; and when determining that the size of the second data is not greater than the capacity of the second encryption area, opening the first encryption area by using a key password, and The second data in the encryption area is all moved to the second backup space.

In one or more embodiments of the present invention, after the step of moving all of the first data to the first backup space is completed, the steps are further included as follows. The access path of the first backup space in the computer device is hidden.

In one or more embodiments of the present invention, the steps are further included as follows after the step of completely moving the second material to the second backup space. The access path of the second backup space in the computer device is hidden.

In one or more embodiments of the present invention, the steps are further included as follows after the step of completely moving the first data to the first backup space. Encrypting the first data in the first backup space. Before the step of moving all the first data into the second non-encrypted area, the steps are further included as follows. Decrypting the first data in the first backup space to retrieve the first data from the first backup space.

In one or more embodiments of the present invention, after the step of moving all of the second material to the second backup space is completed, the steps are further included as follows. Encrypting the second data in the second backup space; and before the step of moving the second data to the second encryption area, the steps further include the following steps. Decrypting the second data in the second backup space to retrieve the second data from the second backup space.

Thus, even if the removable memory device has data before the magnetic zone planning, the original data in the removable memory device is not lost by the non-volatile memory magnetic zone planning method described in the above embodiment. , thereby increasing the user's willingness to use.

The above description is only for explaining the problems to be solved by the present invention, the technical means for solving the problems, the effects thereof, and the like, and the specific details of the present invention will be described in detail in the following embodiments and related drawings.

The embodiments of the present invention are disclosed in the following drawings, and for the purpose of illustration However, it should be understood that these practical details are not intended to limit the invention. That is to say, in the hollow body embodiment of the present invention, these practical details are not necessary. In addition, some of the conventional structures and elements are shown in the drawings in a simplified schematic manner in order to simplify the drawings.

FIG. 1 is a flow chart showing a method for planning a magnetic domain of a non-volatile memory according to an embodiment of the present invention. As shown in FIG. 1, the non-volatile memory magnetic zone planning method of this embodiment is as shown in the following steps 21 to 23. In step 21, all the original data of the removable memory device are moved to the backup space outside the removable memory device. In step 22, the magnetic storage area is planned for the storage space of the removable memory device. In step 23, after the magnetic zone planning for the storage space is completed, all the original data in the backup space is moved back into the storage space of the removable memory device.

In this way, even if the removable memory device has data stored before the magnetic zone planning, the original data in the removable memory device cannot be obtained by the non-volatile memory magnetic zone planning method described in the above embodiment. Lost, thereby increasing the user's willingness to use.

2 is a block diagram of an electronic system of a computer system 10 in accordance with an embodiment of the present invention. As shown in FIG. 2, in the present embodiment, the computer system 10 includes a computer device 100 and a removable memory device 200. The computer device 100 includes a processing unit 110, a display unit 120, a first connection interface 130, and a storage unit 140. The processing unit 110 electrically connects the display unit 120, the first connection interface 130 and the storage unit 140. The storage unit 140 has a backup space 141 and a magnetic zone planning module 144. However, the present invention is not limited thereto, and the backup space may not be located in the computer device 100, but is a location other than the removable memory device. The removable memory device 200 has a second connection interface 210 and a non-volatile memory unit 220. The non-volatile memory unit 220 can store data (hereinafter referred to as the original data 240). The second connection interface 210 is electrically connected to the non-volatile memory unit 220. The removable memory device 200 is detachably connected to the computer device 100, and more specifically, the first connection interface 130 is pluggably connected through the second connection interface 210, and the removable memory device 200 is electrically connected to the computer device 100. The magnetic zone planning module 144 is used for magnetic zone planning of any non-volatile memory unit, so that the non-volatile memory unit can be planned to have only an encrypted area, only a non-encrypted area, or an encryption area of any ratio. And the non-encrypted area, wherein the encrypted area needs to be opened by the key password, that is, the key password is used to use the data in the encrypted area.

It should be understood that the original data 240 in the non-volatile memory unit 220 of the removable memory device 200 is, for example, all files in any format. In addition, in the present invention, the magnetic zone planning module 144 is not limited to hardware, firmware or software in the computer device 100.

FIG. 3 is a detailed flow chart of the non-volatile memory magnetic zone planning method of the embodiment. As shown in FIG. 2 and FIG. 3, in this embodiment, the non-volatile memory unit 220 already has the original data 240, and the non-volatile memory unit 220 of the removable memory device 200 The storage space 221 does not yet have any encrypted area and non-encrypted area. Therefore, when the removable memory device 200 is hot-plugged to the computer device 100, and the processing unit 110 receives an instruction to execute the magnetic zone planning module 144, the processing unit 110 performs the following steps 301 to 308.

In step 301, it is determined whether a request to set an encrypted area and an unencrypted area is received , and if so, step 302 is performed, otherwise step 301 is returned. In step 302, the size of the original data 240 of the storage space 221 in the non-volatile memory unit 220 is detected, and it is determined whether the size of the original data 240 is not greater than the capacity of the backup space 141. If yes, proceed to step 303. Otherwise, step 308 is performed. In step 303, the capacity of the unencrypted area to be set is calculated , and it is determined whether the size of the original data 240 is not greater than the capacity of the non-encrypted area to be set. If yes, proceed to step 304, otherwise proceed to step 308. In step 304, all of the original data 240 in the non-volatile memory unit 220 is copied into the backup space 141. In step 305, the storage space 221 in the non-volatile memory unit 220 is adjusted according to the capacity of the encrypted area and the non-encrypted area to be set. In step 306, after the division of the encrypted area and the non-encrypted area is completed, all the original data 240 in the backup space 141 is copied into the non-encrypted area. In step 307, the original data 240 in the backup space 141 is deleted. In step 308, a corresponding alert message is presented from the display unit 120.

More specifically, in step 302, when the request to set the encrypted area and the non-encrypted area is received, the capacity size of each of the encrypted area and the non-encrypted area is further included.

In step 304, after the original data 240 is completely copied into the backup space 141, the original data 240 in the backup space 141 is further encrypted, so that the outsider cannot directly obtain the backup space 141 by analyzing the computer device 100. The original information 240. In addition, in other embodiments, after the original data 240 is completely copied into the backup space 141, the step 304 further includes hiding the access path of the backup space 141 in the storage unit 140, so that the outsider cannot directly analyze the computer device 100. The original data 240 in the backup space 141 is obtained.

In step 305, more specifically, before the storage space 221 in the non-volatile memory unit 220 is divided into a specific ratio of the encrypted area and the non-encrypted area, the storage space in the non-volatile memory unit 220 is further included. 221 to format.

In step 306 to step 307, more specifically, before copying the original data 240 in the backup space 141 into the non-encrypted area, the original data 240 in the backup space 141 is further decrypted to obtain the original. There is information 240. For example, the decryption is performed by a key cipher so that the original data 240 is authorized to be copied from the backup space 141 to the non-encrypted area, and the original data 240 in the backup space 141 is deleted.

It should be understood that, if the backup space 141 is large enough, the method in this embodiment may also omit step 302, that is, it is not necessary to worry that the original data 240 is larger than the capacity of the backup space 141.

FIG. 4 is a schematic diagram of the operation interface module 250 according to an embodiment of the invention. As shown in FIGS. 2 and 4, in step 301, more specifically, when the processing unit 110 receives an instruction to execute the magnetic zone planning module 144, the processing unit 110 provides an operation interface module through the display unit 120. Group 250. The operation interface module 250 has an adjustment portion 251 and a frame member 252. By moving the adjustment unit 251 in the frame member 252 and pressing the execution button 253, the processing unit 110 can adjust the capacity ratio of the encrypted area to the non-encrypted area in the removable memory device 200. In other words, when the user moves the adjustment unit 251 to the left, a request is made to reduce the capacity of the encryption area and increase the capacity of the non-encrypted area; conversely, when the user moves the adjustment unit 251 to the right, There is a requirement to reduce the capacity of the non-encrypted area and increase the capacity of the encrypted area.

Thus, when it is received that the execution key 253 has been pressed, the above request is sent to the processing unit 110. The processing unit 110 determines that the request to set the encrypted area and the non-encrypted area has been received, so that the user can dynamically adjust the capacity ratio of the encrypted area and the non-encrypted area.

In addition, by moving the adjustment unit 251 to the rightmost or leftmost side, the user may also choose to entirely plan the entire storage space 221 in the non-volatile memory unit 220 as a single encrypted area or a non-encrypted area.

FIG. 5 is an electronic block diagram of a computer system 11 according to an embodiment of the present invention. As shown in FIG. 2 and FIG. 5, the computer system 11 of FIG. 5 is substantially the same as the computer system 10 of FIG. 2, with the difference that the storage unit 140 has a first backup space 142 and a second backup space 143. The storage space 221 of the non-volatile memory unit 220 of the removable memory device 200 has been pre-patterned with a first encryption area 231 and a first non-encrypted area 232, a first encryption area 231 and a first non-encrypted area. 232 is inversely proportional to each other and has a first capacity ratio (or inverse ratio), and the first data 241 is already stored in the first unencrypted area 232, and the second data 242 is already stored in the first encryption area 231.

6 is a detailed flow chart of a non-volatile memory magnetic zone planning method according to an embodiment of the present invention, as shown in FIGS. 5 and 6, in this embodiment, when the removable memory device 200 is provided. When the computer device 100 is hot-swapped, and the processing unit 110 receives an instruction to execute the magnetic zone planning module 144, the processing unit 110 performs the following steps according to steps 601 to 610.

In step 601, it is determined whether a requirement to change the first capacity ratio to a second capacity ratio is received, so as to plan the storage space 221 of the non-volatile memory unit 220 to be the second encryption area (not shown). And the second unencrypted area (not shown), if yes, proceed to step 602, otherwise return to step 601. In step 602, the size of the first data 241 is detected, and it is determined whether the size of the first data 241 is not greater than the capacity of the first backup space 142 of the storage unit 140. If yes, proceed to step 603; otherwise, proceed to step 610. In step 603, the capacity ratio according to the second calculated capacity of the second non-encrypted area, and this determines the size of the first data 241 is not greater than the capacity of the second non-encrypted area, and if so, proceeds to step 604, otherwise proceeds to step 610. In step 604, the size of the second data 242 is detected, and it is determined whether the size of the second data 242 is not greater than the capacity of the second backup space 143 of the storage unit 140. If yes, proceed to step 605; otherwise, proceed to step 610. In step 605, the capacity ratio according to the second calculated capacity of the second encryption area, and size information 242 of this second determination is not greater than the capacity of the second encryption area, and if so, proceeds to step 606, otherwise proceeds to step 610. In step 606, all the first data 241 of the storage space 221 are copied into the first backup space 142, and the second data 242 of the storage space 221 is all copied into the second backup space 143. In step 607, the storage space 221 in the non-volatile memory unit 220 is readjusted according to the second capacity ratio, so that the storage space 221 in the non-volatile memory unit 220 is divided into the second encrypted area and the second unencrypted area. . In step 608, after the division of the second encryption zone and the second non-encryption zone is completed, the first data 241 in the first backup space 142 is all copied into the second non-encryption zone, and the second backup space 143 is The second data 242 is copied to the second encryption area. In step 609, the first data 241 in the first backup space 142 and the second data 242 in the second backup space 143 are deleted. In step 610, a corresponding alert message is presented from the display unit 120.

Specifically, in step 601, the requirement of changing the first capacity ratio may be sent through the operation interface module 250 of FIG. 4 to dynamically adjust the capacity ratio of the encrypted area to the non-encrypted area. The details are as shown above and will not be described here.

In step 606, after the first data 241 is completely moved to the first backup space 142, the first data 241 in the first backup space 142 is further encrypted, so that the outsider cannot directly obtain the computer device 100. The first data 241 in the first backup space 142. In addition, in other embodiments, after the first data 241 is completely moved to the first backup space 142, the step 606 further includes hiding the access path of the first backup space 142 in the storage unit 140, so that the outsider cannot analyze the computer. The device 100 directly obtains the first data 241 in the first backup space 142.

In step 606, when it is determined that the size of the second data 242 is not greater than the capacity of the second encryption area, the first encryption area 231 is further opened by using a key password, so that the first encryption area 231 is authorized. The second data 242 all copies the second backup space 143. The key cipher of the first encryption area 231 is obtained through the input of the user to obtain the second data 242.

In addition, after the second data 242 is completely moved to the second backup space 143, the second data 242 in the second backup space 143 is further encrypted, so that the external person cannot directly obtain the second backup by analyzing the computer device 100. The second material 242 in the space 143. In addition, in other embodiments, after the second data 242 is completely moved to the second backup space 143, the step 606 further includes hiding the access path of the second backup space 143 in the storage unit 140, so that the outsider cannot analyze the computer. The device 100 directly acquires the second material 242 in the second backup space 143.

In step 607, more specifically, before the storage space 221 in the non-volatile memory unit 220 is divided into the second encrypted area and the second unencrypted area, the storage in the non-volatile memory unit 220 is further included. The space 221 is formatted.

In step 608 to step 609, more specifically, before copying the first data 241 in the first backup space 142 to the second non-encrypted area, the first data 241 in the first backup space 142 is further included. Decryption is performed to obtain the first data 241. For example, the first data 241 can be copied from the first backup space 142 to the second unencrypted area by decrypting through a key password, and the first data 241 in the first backup space 142 is deleted. Similarly, before copying the second data 242 in the second backup space 143 to the second encryption area, the second data 242 in the second backup space 143 is further decrypted to obtain the second data 242. For example, the second data 242 can be copied from the second backup space 143 to the second encryption area by decrypting through a key password, and the second data 242 in the second backup space 143 is deleted. In step 608, more specifically, before copying the second data 242 in the second backup space 143 to the second encryption area, and further including decrypting through a key password, the second backup space 143 can be The second data 242 is all copied into the second encryption zone.

It should be understood that, in another embodiment, the present invention is not limited to the sequence of steps 602 to 605; or, in other embodiments, if the first backup space 142 is sufficiently large with the second backup space 143, the embodiment is The method may also omit step 602 and step 604.

For example, but not limited to, the removable memory device 200 is, for example, a USB removable memory device, a smart electronic device, a memory card, an external hard disk, or the like, wherein The smart device can be, for example, a smart phone or a tablet; the processing unit 110 is, for example, a central processing unit or the like; the first connection interface 130 and the second connection interface 210 are, for example, a USB connection interface or the like; the storage unit 140 For example, a hard disk device or the like; the non-volatile memory unit 220 is, for example, a flash memory or the like.

Finally, the various embodiments disclosed above are not intended to limit the invention, and those skilled in the art can be protected in various modifications and refinements without departing from the spirit and scope of the invention. In the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

10, 11‧‧‧ computer system

21~23‧‧‧Steps

100‧‧‧ computer equipment

110‧‧‧Processing unit

120‧‧‧Display unit

130‧‧‧First connection interface

140‧‧‧ storage unit

141‧‧‧Backup space

142‧‧‧First backup space

143‧‧‧Second backup space

144‧‧‧Magnetic area planning module

200‧‧‧Removable memory device

210‧‧‧Second connection interface

220‧‧‧Non-volatile memory unit

221‧‧‧ storage space

231‧‧‧First encryption zone

232‧‧‧First unencrypted area

240‧‧‧ original information

241‧‧‧First Information

242‧‧‧Second information

250‧‧‧Operation interface module

251‧‧‧Adjustment Department

252‧‧‧Frame components

253‧‧‧Execution key

301~308‧‧‧Steps

601~610‧‧‧Steps

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood. The description of the drawings is as follows: FIG. 1 is a diagram showing a non-volatile memory magnetic zone planning method according to an embodiment of the present invention. FIG. 2 is a block diagram showing an electronic block diagram of a computer system according to an embodiment of the present invention; FIG. 3 is a detailed flow chart showing a non-volatile memory magnetic zone planning method according to the embodiment; FIG. 5 is an electronic block diagram of a computer system according to an embodiment of the present invention; and FIG. 6 is a non-volatile embodiment of the present invention. A detailed flow chart of the memory magnetic zone planning method.

Claims (16)

A non-volatile memory magnetic zone planning method includes: moving all original data of a removable memory device to a backup space outside the removable memory device, wherein the removable memory The device has an encryption area and a non-encrypted area, the encryption area and the non-encrypted area have a capacity ratio; magnetic area planning is performed on a storage space of the removable memory device; and magnetic area is completed in the storage space After planning, all the original data in the backup space is moved back into the storage space. The non-volatile memory magnetic zone planning method according to claim 1, wherein each time a request for changing the capacity ratio is received, determining whether the size of the original data is not greater than the ratio of the capacity to be changed The capacity of the non-encrypted area. The non-volatile memory magnetic zone planning method according to claim 2, wherein the step of performing magnetic zone planning on the storage space further comprises: re-adjusting the encryption of the removable memory device according to the capacity ratio to be changed. Zone and the non-encrypted zone. The non-volatile memory magnetic zone planning method of claim 1, wherein the step of performing magnetic zone planning on the storage space comprises: dividing the storage space into an encrypted area and an unencrypted area, wherein the encrypted area It can only be opened with a key password. The non-volatile memory magnetic zone planning method of claim 4, wherein the step of moving the original data in the backup space back into the storage space further comprises: the original in the backup space The data is moved to the encrypted area and the unencrypted area, respectively. The non-volatile memory magnetic zone planning method according to claim 4, wherein before the step of performing magnetic zone planning on the storage space, the method further comprises: determining whether the size of the original data is not greater than the capacity of the backup space; Determining whether the size of the original data is not greater than the capacity of the backup space, determining whether the size of the original data is not greater than the capacity of the non-encrypted area; and determining that the size of the original data is not greater than the capacity of the non-encrypted area When the original data is moved to the backup space. The non-volatile memory magnetic zone planning method of claim 1, wherein the step of moving the original data to the backup space further comprises: encrypting the original data in the backup space; Before the step of moving the original data back into the storage space, the method further comprises: decrypting the original data in the backup space to obtain the original data. The non-volatile memory magnetic zone planning method of claim 1, wherein after the step of moving the original data to the backup space is completed, the method further comprises: hiding an access path of the backup space. The non-volatile memory magnetic zone planning method according to claim 1, wherein the storage space has at least one original encryption zone before the step of moving the original data to the backup space, wherein the original encryption zone can only It is turned on via a key code. A non-volatile memory magnetic zone planning method includes: connecting a removable memory device to a computer device, wherein the removable memory device has a first encryption region and a first non-encrypted region, The capacity of the first encryption zone has a first capacity ratio with the capacity of the first unencrypted zone; the first non-encryption is received whenever a requirement to change the first capacity ratio to a second capacity ratio is received One of the first data in the area is moved to a first backup space in the computer device, and one of the second data in the first encryption area is moved to a second backup space in the computer device; The two-capacity ratio re-adjusts the removable memory device such that the removable memory device is divided into a second encrypted area and a second unencrypted area; and the first data in the first backup space is all Moving to the second non-encrypted area, and the second data in the second backup space is all moved to the second encrypted area. The non-volatile memory magnetic zone planning method of claim 10, wherein each time the request is received, the method further comprises: determining whether the size of the first data is not greater than a capacity of the second unencrypted area; When it is determined that the size of the first data is not greater than the capacity of the second unencrypted area, the first data is all moved to the first backup space. The non-volatile memory magnetic zone planning method of claim 10, wherein each time the request is received, the method further comprises: determining whether the size of the second data is not greater than a capacity of the second encryption zone; When the size of the second data is not greater than the capacity of the second encryption area, the first encryption area is opened by using a key password, and the second data in the first encryption area is all moved to the second backup. space. The non-volatile memory magnetic zone planning method of claim 10, wherein after the step of moving the first data to the first backup space is completed, the method further comprises: hiding the first backup in the computer device. The access path of the space. The non-volatile memory magnetic zone planning method of claim 10, wherein after the step of moving the second data to the second backup space is completed, the method further includes: hiding the second backup in the computer device The access path of the space. The non-volatile memory magnetic zone planning method of claim 10, wherein after the step of moving the first data to the first backup space is completed, the method further comprises: the first in the first backup space Encrypting a data; and before the step of moving the first data to the second non-encrypted area, the method further comprises: decrypting the first data in the first backup space to obtain the first backup The first data is taken out of the space. The non-volatile memory magnetic zone planning method according to claim 10, wherein after the step of moving the second data to the second backup space is completed, the method further comprises: the first in the second backup space And the second data is decrypted to decrypt the second data in the second backup space from the second backup space. The second data is taken out.