TWI670640B - Data storage method and data recovery method for data storage device, and data storage device using the same methods - Google Patents

Abstract

The present invention proposes a data storage method and a data recovery program that can be used for a data storage device, and a data storage device using the same. The data storage method includes: selecting an active data block to store data from the host; determining whether a power interruption event occurs; when the determination is yes, recording the number of the active data block and the last data having the data in the active data block The number of the data page; the primary F2H comparison table is generated; and the primary F2H comparison table, the number of the active data block, and the number of the last data page with the data are written to the designated data block.

Description

Data storage method and data recovery procedure that can be used for data storage devices, And data storage device using these methods

The present invention relates to techniques for data storage, and more particularly to a data storage method and a data recovery program that can be used for data storage devices, and a data storage device using the same.

Traditionally, a data storage device using a non-volatile memory as a data storage medium must generate a physical address to a logical address (Flash Physical-to-Host) if a power interruption event occurs during operation. Logical address mapping table, F2H) comparison table, hereinafter referred to as F2H comparison table, to establish the correspondence between physical address and logical address of user data (referred to as correspondence) Loss of user data. It can be seen that the F2H comparison table is extremely important for the operation of the data storage device.

However, after a power outage event occurs, the data storage device needs to establish and store the F2H lookup table in the few remaining time. Therefore, how to establish a streamlined F2H comparison table and store it in the appropriate place, so that the data storage device can obtain user data according to the F2H comparison table during the power-on, there is a practical requirement.

It is an object of the present invention to provide a data storage method that can be used in a data storage device in which the amount of data generated by the F2H look-up table is small.

Another object of the present invention is to provide a data recovery procedure corresponding to the above data storage method.

Still another object of the present invention is to provide a data storage device using the above method.

The present invention provides a data storage method that can be used for a data storage device. The data storage method includes the following steps: selecting an active data block to store data from the host; determining whether a power interruption event occurs; and when the determination is yes, recording the initiative The number of the data block and the number of the last data page with the data in the active data block; generate the main F2H comparison table; and the main F2H comparison table, the number of the active data block, and the last data page with the data The number is written to the specified data block.

The present invention further provides a data storage method that can be used for a data storage device. The data storage method includes the following steps: selecting an active data block to store data from the host; determining whether a power interruption event occurs; when the determination is yes, further Determining whether another power interruption event has occurred in the active data block; when the result of the further determination is no, recording the number of the active data block and the major number of the last data page having the data in the active data block; The F2H comparison table; and the main F2H comparison table, the number of the active data block, and the major number of the last data page with the data are written to the designated data block.

The invention further proposes a data replying program which can be used for the data storage device. The data replying program comprises the following steps: reading the designated data block to obtain the F2H comparison table, the number of the active data block, and the last data page having the data. Number; determine whether the content of the F2H comparison table is consistent with the number of the active data block and the number of the last data page with the data; when the determination is yes, store the F2H comparison table to the volatile storage medium; and select an active Data block to store data from the host.

The invention further provides a data storage device comprising a non-volatile storage medium and a control unit. The control unit is configured to select an active data block from the non-volatile storage medium to store data from the host and determine whether a power interruption event occurs. When judged as yes When the control unit records the number of the active data block and the number of the last data page with the data in the active data block, the main F2H comparison table is generated, and the main F2H comparison table and the number of the active data block are generated. And the number of the last data page with the data is written to the specified data block in the non-volatile storage medium.

The invention further provides a data storage device comprising a non-volatile storage medium and a control unit. The control unit is configured to select an active data block from the volatile storage medium to store data from the host, and determine whether a power interruption event occurs. When the determination is yes, further determine whether another active power interruption event has occurred in the active data block. And when the result of the further judgment is no, the control unit records the number of the active data block and the major number of the last data page having the data in the active data block, thereby generating a main F2H comparison table, and the main F2H The comparison table, the number of the active data block, and the major number of the last data page with the data are written to the designated data block of the non-volatile storage medium.

The invention further proposes a data storage device comprising a volatile storage medium, a non-volatile storage medium and a control unit. The control unit is configured to read the designated data block in the non-volatile storage medium, obtain the F2H comparison table, the number of the active data block, and the number of the last data page having the data, and determine whether the content of the F2H comparison table is The number of the active data block and the number of the last data page with the data are the same. When the determination is yes, the control unit stores the F2H comparison table to the volatile storage medium, and selects the active data block from the non-volatile storage medium to store the data from the host.

In the present invention, since the F2H comparison table generated by the control unit when the power is interrupted only records the correspondence of the data of the partial data pages, the amount of data generated by the F2H comparison table is less than that produced by the learned method. The amount of data in the complete F2H comparison table can not only reduce the amount of data in the F2H comparison table, but also reduce the time required for the generated F2H comparison table, and store the F2H comparison table in the data block with better data retention ability. Better protection of the F2H comparison table is provided.

100‧‧‧Host

110‧‧‧Central Processing Unit

120‧‧‧Connection interface

200‧‧‧ data storage device

210‧‧‧Control unit

212‧‧‧Interface logic

214‧‧‧Microprocessor

216‧‧‧Control logic

220‧‧‧Non-volatile storage media

230‧‧‧Volatile storage media

240‧‧‧SLC type data block

250‧‧‧Multi-planar data page

260‧‧‧Super Data Block

270‧‧‧Super Data Page

F2H#0~F2H#3‧‧‧F2H comparison table with numbers

P1, P2‧‧‧ plane

S301~S305, S401~S409, S501-S505‧‧‧ steps

1 is a data storage device according to an embodiment of the invention and its electrical coupling relationship with a host; FIG. 2 illustrates an implementation of a non-volatile storage medium 220 according to an embodiment of the invention; FIG. A flowchart of a data storage method according to an embodiment of the present invention; FIG. 4 is a flowchart of a data storage method according to another embodiment of the present invention; and FIG. 5 is a flowchart of a data recovery procedure according to an embodiment of the present invention.

1 depicts a data storage device and its electrical coupling relationship with a host in accordance with an embodiment of the present invention. Referring to FIG. 1 , the host 100 mainly includes a central processing unit 110 and a connection interface 120 . The connection interface 120 is adapted to be electrically coupled to the data storage device 200. The central processing unit 110 is configured to transmit commands and data to the data storage device 200 through the connection interface 120, for example, to transmit a read command to the data storage device 200, or to transmit a write command and data to be written to the data storage device 200. Storage device 200. In this example, the host 100 includes a computer, a mobile phone, a tablet, a camera, or other handheld electronic device with computing functions.

The data storage device 200 mainly includes a control unit 210, a non-volatile storage medium 220, and a volatile storage medium 230. The control unit 210 is electrically coupled to the non-volatile storage medium 220 and the volatile storage medium 230, and is used to control the operations of the non-volatile storage medium 220 and the volatile storage medium 230 (eg, accessing and erasing data). In this example, the non-volatile storage medium 220 has long lengths such as a flash memory, a magnetoresistive random access memory (Magnetoresistive RAM), and a ferroelectric random access memory (Ferroelectric RAM). The memory device in which the time data is stored is realized. In the following description, the flash memory will be described as an example, but not limited thereto.

The volatile storage medium 230 is, for example, a component having a data buffering function such as a dynamic random access memory (DRAM) or a static random access memory (SRAM). to realise.

Control unit 210 primarily includes interface logic 212, microprocessor 214, and control logic 216. The microprocessor 214 is electrically coupled to the interface logic 212 and the control logic 214. The microprocessor 214 is configured to access the data in the non-volatile storage medium 220 and the volatile storage medium 230 through the control logic 216, and the microprocessor 214 is further configured to receive commands or materials from the host 100 through the interface logic 212, such as : a write command, a data to be written to the data storage device 200, a read command, an erase command, and the like.

2 depicts an implementation of a non-volatile storage medium 220 in accordance with an embodiment of the present invention. Referring to FIG. 2, the non-volatile storage medium 220 includes memories 0-4. The memory 0 is preferably an SLC (Single Level Cell) type flash memory to provide greater data access capability or better data integrity. The memory 0 can be used to store confidential data, protection data or management data, wherein the protection data includes: security information (such as a password) set by the user, a debug log, etc., wherein the error log Preferred is SMART (Self-Monitoring Analysis and Reporting Technology) information. The memory 0 has a plurality of SLC type data blocks 240, and each of the SLC type data blocks 240 preferably has two planes, which are represented by planes P1 and P2, respectively. Each plane has Q+1 physical pages, where Q is a natural number, for example 256. The control unit 210 preferably accesses a data page of the planes P1 and P2 at the same time. This mode of operation is called multi-planes access, and logically views the two planes P1 and P2. For a multi-plan data page 250. Of course, the control unit 210 can also access a data page of the planes P1 and P2, which is an implementation option, and is not limited thereto.

Memory 1~4 is preferably TLC (Triple-Level Cell) Unit) type flash memory for storing user data. Each memory 1~4 also has multiple TLC type data blocks, and each TLC type data block has two planes, which are respectively represented by P1 and P2, and support multi-planes access; each The plane has R+1 material pages (or physical pages), where R is a natural number, for example 2304. The control unit 210 preferably accesses one TLC type data block of the memory 1~4 at the same time. At this time, a total of four TLC type data blocks can be logically regarded as one super data block 260, and A total of 8 data pages are considered a super data page 270. Of course, the control unit 210 can also select only one of the data blocks 1 to 4 for access, which is an implementation option, and is not limited thereto.

In practice, the memory 0 can also be an MLC (Multi-Level Cell) or a TLC type flash memory operating in a binary mode; the memory 1~4 can also be a MLC or SLC type flashing. Memory. The user can replace it according to his actual needs, and is not limited to the setting in the present invention.

FIG. 3 is a flow chart of a data storage method according to an embodiment of the present invention. Please refer to FIG. 1 to FIG. 3 at the same time. Step S301: Select an active data block to store the data from the host 100. When the data storage device 200 receives the write command from the host 100, the control unit 210 of the data storage device 200 selects a super data block 260, for example, a super data block #0, as an active data block for storage. The data from the host 100 is preferably stored in the super data page 270 of the super data block #0. Assuming that the super data block #0 contains 2304 super data pages 270, the data from the host 100 is preferably written from the super data page #0 of the super data block #0, followed by the super data page #1, The following and so on. If the super data block #0 has been filled with data, the control unit 210 will select another super data block 260, such as the super data block #1, as the active data block to store the subsequent data.

In step S302, it is determined whether a power interruption event occurs. The control unit 210 continuously determines whether a power interruption event has occurred. When the host 100 stops supplying power to the data storage device 200 for any reason, or requests the data storage device 200 to enter a specified power state. (Power state) to save power consumption, may trigger a power interruption event.

Step S303, recording the number of the active data block and the number of the last data page having the data in the active data block. Assuming that a power interruption event occurs, the last completed data write or the data to be completed is the super data page #63 of the super data block #0, then the super data page #63 is the last super data page 270 with the data. Then, the control unit 210 records both the number 0 of the super data block and the number 63 of the super data page 270.

Step S304, a main F2H comparison table is generated, wherein the main F2H comparison table records the correspondence between the last data page having the data and the data of all the previous data pages. In the foregoing example, the primary F2H comparison table records the super data page #63 of Super Data Block #0 and all of its previous Super Data Pages 270, that is, Super Data Page #0 to Super Data Page #63 Total 64 Super data page 270, the correspondence of the data. Compared with the conventional method, the complete F2H comparison table generated by the conventional method needs to record the correspondence between the super data page #0 to the super data page #2303 and the total data of 2304 super data pages 270. In contrast, the main F2H comparison table produced by the data storage method of the present invention is only a part of the complete F2H comparison table, and the time required to generate the main F2H comparison table is also shorter, except for a small amount of data.

In another embodiment of step S304, the primary F2H look-up table records only the correspondence between the last material page having the material and the valid data of all of the previous material pages. In the foregoing example, the last data page with data is super data page #63. If the data stored in the super data pages #0~#63 are all valid data, the control unit 210 will generate a super data page. The main F2H comparison table of the correspondence relationship of the data of 0~#63, the content of the main F2H comparison table is the same as that of the previous embodiment; it is assumed that only the super data page #60~#63 in the super data page #0~#63 is stored. The information of the data is valid data, the control unit 210 only generates the main F2H comparison table of the correspondence relationship of the data including the super data pages #60 to #63, so that the size of the main F2H comparison table of this embodiment will be smaller than the previous one. Example. In summary, the amount of data of the main F2H comparison table produced by this embodiment will be smaller than that of the complete F2H. Compare the amount of data in the table.

Step S305, the main F2H comparison table, the number of the active data block, and the number of the last data page having the data are written into the designated data block, wherein the designated data block and the active data block are preferably different types. The data storage capacity of each data block, or each storage unit (cell) of the designated data block, is not greater than the data storage capacity of each storage unit (cell) of the active data block, or the designated data block is not stored for storage. The data of the host 100. Taking the above as an example, the control unit 210 writes the generated main F2H lookup table, the number 0 of the super data block 260, and the number 63 of the last super data page 270 with the data to the SLC type data block #0. Multi-planar data page 250.

The complete F2H comparison table generated by the conventional method records the correspondence of the data of 2304 super data pages 270 of the super data block #0, and the storage of the complete F2H comparison table requires the SLC type data block 240. The 72 multi-planar data pages 250 are stored, and the complete F2H comparison table is preferably divided into 72 parts, so that each divided complete F2H comparison table can be stored in a data page of the SLC type data block 240 and given separately. A number, for example, number 0~71, the first F2H comparison table after the first segmentation is the F2H#0 comparison table, and the 72nd segmented complete F2H comparison table is the F2H#71 comparison table, and each segmented The complete F2H comparison table can record the correspondence of the data of 32 super data pages 270. In addition, the user can also save each divided complete F2H comparison table to a plurality of data pages of the SLC type data block 240, and the operation principle is similar, so there is no description. Since the size of the primary F2H lookup table and the multiplanar data page 250 of the SLC type data block 240 is known, the control unit 210 can calculate the number of multiplanar data pages 250 required to store the primary F2H lookup table and will The main F2H comparison table is divided, and each of the divided main F2H comparison tables is given an index, which is consistent with the number of the completed F2H comparison table.

Since the main F2H comparison table is only a part of the complete F2H comparison table, assuming that the main F2H comparison table needs to be stored to the two multi-planar data pages 250 of the SLC type data block 240, the control unit 210 can segment the main F2H comparison table. And write to the multi-plane The materials page #K and #K+1, where K is also a natural number, and the F2H#0 comparison table and the F2H#1 comparison table are stored in the two multi-planar data pages 250, respectively. Preferably, the numbers of the F2H#0 comparison table and the F2H#1 comparison table, that is, the numbers 0 and 1, can be respectively recorded in the interpretation data (matadata) of the multi-planar data pages #K and #K+1, as the future Basis for data validation. In addition, the number of the super data block 260 (ie, number 0) and the number of the last super data page 270 having the data (ie, number 63) can also be recorded in the interpretative data of the multi-planar data pages #K and #K+1. It can also be used as a basis for future data confirmation.

Since the reliability (ie, error rate) of the SLC type flash memory 240 is superior to the reliability of the MLC type flash memory, the reliability of the MLC type flash memory is superior to the reliability of the TLC type flash memory. Therefore, storing the main F2H comparison table generated in step S303 in the SLC type data block 240 can make the main F2H comparison table better protected.

4 is a flowchart of a data storage method according to another embodiment of the present invention. Compared with the embodiment corresponding to FIG. 3, the embodiment corresponding to FIG. 4 is applicable to multiple power interruption events occurring on the same active data block. Processing. Step S401: Select an active data block to store data from the host 100; S402: determine whether a power interruption event occurs. Since steps S401 and S301 are the same, steps S402 and S302 are the same, and therefore will not be described.

Step S403, when the result of the determination in step S402 is YES, it is determined whether another active power interruption event has occurred in the active data block. In the foregoing example, it is determined whether the other power interruption event has occurred in the super data block #0.

Step S404, when the result of the determination in step S403 is no, the number of the active data block and the main number of the last data page having the data in the active data block are recorded; in step S405, a main F2H comparison table is generated, wherein the main F2H The comparison table records the correspondence between the last data page having the data and the data of all the previous data pages; in step S406, the main F2H comparison table, the number of the active data block, and the main data page with the last data page. The number is written to the specified data block, wherein the designated data block and the active data block are preferably different types of data blocks, or designated data blocks. The data storage capacity of each storage unit is not greater than the data storage capacity of each storage unit of the active data block, or the designated data block is not used to store data from the host 100. Since step S404 is similar to S303, step S405 is the same as S304, and step S406 is similar to S305. The main difference is that the number of the last data page having the data is changed to the main number of the last data page having the data, so it is not much Description.

Step S407, when the result of the determination in step S403 is YES, the number of the active data block and the minor number of the last data page having the data are recorded. Assume that the power data interrupt event (called the first power interruption event) has occurred in the super data block #0, and the last super data page 270 with the data at that time is the super data page #63. Now again the power interruption event (referred to as the second power interruption event), and the last super data page 270 with data is the super data page #127, then the control unit 210 will record the number 0 of the super data block. And the super data page number 128 (ie minor number).

In step S408, a secondary F2H comparison table is generated. The F2H comparison table records the main number of the step S404 and the minor number of the step S407, and the correspondence between the data of all the data pages between the two numbers. The control unit 210 generates a secondary F2H comparison table, and this time the F2H comparison table records the number of the last super data page 270 with the data (ie, number 63) and the second power interruption event at the time of the first power interruption event. The last number of the super data page 270 with the data (number 127), the correspondence between the data of all the super data pages 270 between the two numbers. Since the secondary F2H comparison table records the correspondence of the data of the super data page #64 to the super data page #127 to the super data page 270, instead of the super data page #0 to the super data page #127 The correspondence of the data of the 128 super material pages 270, therefore, the control unit 210 can complete the establishment of the secondary F2H comparison table in less time.

In step S409, the secondary F2H comparison table, the number of the active data block, and the secondary number of the last data page having the data are written to the designated data block. The control unit 210 will newly generate the secondary F2H comparison table, the number of the super data block 260 (ie, number 0), and the last super data page 270 with the data at the second power interruption. The minor number (i.e., number 127) is written to the multi-plane data page 250 of the SLC type data block #0.

Assume that the secondary F2H comparison table of the correspondence of the data of the 64 super data pages 270 of the super data page #64 to the super material page #127 is stored in the two multi-plane data pages 250 in the SLC type data block 240. Then, the control unit 210 may divide and write the secondary F2H comparison table to the multi-plane data pages #K+2 and #K+3, respectively, and store the F2H#2 comparison table and the two multi-plane data pages 250 respectively. F2H#3 comparison table. Preferably, the numbers of the F2H#2 lookup table and the F2H#3 lookup table, namely numbers 2 and 3, the number of the super data block 260 (ie number 0), and the number of the last super data page 270 with the data ( That is, the number 127) is recorded in the interpretation data of the multi-planar data pages #K+2 and #K+3, as the basis for the confirmation of the future data.

Assume that the data of the super data page #64 to the super data page #127 is not all new data, but the updated data, the number of the F2H comparison table after the division may be repeated. . For example, the data stored in Super Data Page #64 to Super Data Page #127 contains 32 new data and the updated data of Super Data Page #0-31, then the secondary F2H comparison table contains F2H#2 comparison table and updated. The F2H#0 comparison table, the control unit 210 can store the F2H#2 comparison table and the updated F2H#0 comparison table to the multi-planar data pages #K+2 and #K+3, and compare the F2H#2 comparison table with The updated F2H#0 comparison table numbers, ie, numbers 2 and 0, can be recorded in the matadata of the multi-planar data pages #K+2 and #K+3, respectively, as the basis for data validation. In addition, the number of the super data block 260 (ie, number 0) and the number of the last super material page 270 having the data (ie, number 127) may also be recorded on the multi-planar data pages #K+2 and #K+3. Interpretation data can also be used as a basis for data validation.

FIG. 5 is a flowchart of a data recovery procedure according to an embodiment of the present invention. The data recovery procedure of the present invention can be applied to the data storage apparatus 200 to facilitate data recovery after power is restored. Step S501, reading the designated data block to obtain the F2H comparison table, the number of the active data block, and the number of the last data page having the data. Control unit 210 reads SLC class The content of the type data block 240 can obtain an F2H comparison table, for example, the main F2H comparison table stored in step S305, or the main F2H comparison table stored in step S406 and the secondary F2H comparison table stored in step S409.

Step S502 determines whether the content of the F2H comparison table is consistent with the number of the active data block and the number of the last data page having the data. Since the number of the F2H comparison table has been established, the total number of the F2H comparison tables after the division can be known by interpreting the number of the F2H comparison table recorded in the data. Then, it is judged whether it is necessary to combine the divided F2H comparison tables to obtain a complete main F2H comparison table and a secondary F2H comparison table. The contents of the main F2H comparison table and the secondary F2H comparison table themselves contain the number of the active data block and the information of the last data page number (primary number and secondary number) of the data, and the control unit 210 can borrow more than this. The data can be judged. Assuming that the active data block recorded in the interpretation data is the super data block #0, and the last super data page 270 having the data has a major number of 63 and a minor number of 127, the control unit 210 determines whether these are The records of the main F2H comparison table and the secondary F2H comparison table are met. If the F2H comparison table includes the main F2H comparison table and the secondary F2H comparison table, since the secondary F2H comparison table only records the correspondence of the newly added or updated data after the first power interruption event, the secondary F2H comparison table is required. The complete F2H comparison table is combined with the main F2H comparison table, and the correspondence relationship of all the super data pages 270 having the data in the super data block #0 can also be obtained. If the number of the sub-divided F2H comparison table is repeated with the number of the divided main F2H comparison table, as shown in the F2H#0 comparison table described in the above example, this means that after the first power interruption event, super The data of the data page #0~#31 has been updated. Therefore, the correspondence of the data of the super data page #0~#31 will be based on the divided secondary F2H comparison table (ie, F2H#0 comparison table).

In step S503, if the result of the determination in step S502 is YES, the F2H comparison table is stored in the volatile storage medium 230. The control unit 210 stores the main F2H comparison table to the volatile storage medium 230, or simultaneously stores the primary F2H comparison table and the secondary F2H comparison table to the volatile storage medium 230.

Step S504, the active data block is selected to store the data from the host 100. Taking the above as an example, since the super data block #0 still has space to store the data from the host 100, the control unit 210 writes the subsequent data into the super data block #0. Taking the above as an example, if the F2H comparison table contains only the main F2H comparison table, the subsequent data will be written to the super data page #64 and the subsequent super data page 270; if the F2H comparison table contains the main F2H comparison table and the secondary F2H The comparison table will be written to the super data page #128 and the subsequent super data page 270.

In another embodiment, in step S503, the control unit 210 writes the F2H comparison table into the active data block, and in step S504, select another super data block 260, such as the super data block #1, as the active A data block to store data from the host 100. Alternatively, in step S503, the control unit 210 writes the primary F2H comparison table and the secondary F2H comparison table into the active data block, and in step S504, select another super data block 260, such as super data block #1, As an active data block, the data from the host 100 is stored. In this embodiment, since the power interruption event has occurred in the super data block #0, the data storage capability may have been affected. Therefore, the super data block #0 is closed, and the super data block #1 is selected as the active. Data blocks can reduce the risk of data loss. Further, if the result of the determination in step S502 is NO, the control unit 210 will execute the data repair program (as shown in step S505), and since the data repair program is a conventional technique, it will not be described.

In summary, in the present invention, since the primary or secondary F2H comparison table generated by the control unit 210 when the power is interrupted only records the correspondence relationship of the data of the data pages storing the data, the primary or secondary The amount of data in the F2H comparison table will be less than the amount of data in the complete F2H comparison table produced by the known method, which will not only reduce the amount of data in the primary or secondary F2H comparison table, but also reduce the occurrence of primary or secondary F2H comparison tables. The time required and the storage of the primary or secondary F2H control tables into the data blocks with better data retention capabilities provide better protection of the primary or secondary F2H control tables.

Claims (13)

A data storage device includes: an active data block; and a designated data block record, an F2H comparison table, and a number of the active data block, wherein the F2H comparison table records the data stored in the active data block Corresponding relationship, wherein the designated data block records the F2H comparison table and the number of the active data block after an interruption event. The data storage device of claim 1, wherein the active data block and the designated data block are the same type of data block. The data storage device of claim 1, wherein the active data block and the designated data block are different types of data blocks. The data storage device of claim 1, wherein the active data block and the designated data block operate in different working modes. The data storage device of claim 1, wherein the F2H comparison table records only the correspondence between the valid data stored in the active data block. The data storage device of claim 1, wherein the data storage device further comprises a control unit. The data storage device of claim 1, wherein the active data block stores data from a host. The data storage device of claim 1, wherein the designated data block further records the number of the last data page having the data in the active data block. A data reply method includes the following steps: determining whether an interrupt event has occurred; if yes, temporarily storing an F2H comparison table recorded in a designated data block; and an active data area recorded according to the specified data block The active data block is selected by the number of the block, and the data from a host is stored by the active data block, wherein the finger The data block records the F2H comparison table and the number of the active data block after an interruption event. The method for replying data according to claim 9 , wherein the active data block and the designated data block are the same type of data block. The method for replying data according to claim 9 is characterized in that the active data block and the designated data block are different types of data blocks. The method for replying data according to claim 9 is characterized in that the active data block and the designated data block operate in different working modes. The method for replying data according to claim 9 , wherein the F2H comparison table records only the correspondence between the valid data stored in the active data block.