TW201907309A - Storage apparatus managing system and storage apparatus managing method - Google Patents

Abstract

A storage apparatus managing method, applied to a first storage apparatus and a second storage apparatus coupled to an electronic apparatus, wherein the first storage apparatus comprises a local registering region and a global registering region, comprising: (a) receiving a read request indicating reading a target data unit from the second storage apparatus; (b) confirming if the global registering region has the target data unit; (c) if yes, reading the target data unit from the global registering region, if not, confirming if the local registering region has the target data unit; and (d) reading the target data unit from the local registering region if the local registering region has the target data unit, reading the target data unit from the second storage apparatus if the local registering region does not have the target data unit.

Description

Storage device management system and storage device management method

The present invention relates to a storage device management system and a storage device management method, and more particularly to a storage device management system and a storage device management method for increasing a reading speed by providing a temporary storage area in an electronic device.

In recent years, portable electronic devices such as mobile phones, tablet computers, and wearable electronic devices have become more and more popular. However, portable electronic devices generally have a problem of small capacity. To increase the capacity of the portable electronic device, the capacity of the internal memory of the portable electronic device itself is usually increased, or the portable electronic device is used. The device is equipped with an external memory card. However, portable electronic devices with large internal memory capacities are generally quite expensive. The external memory card is relatively small in size, and is easily lost after being removed from the portable electronic device, and some portable electronic devices do not support an external memory card.

Therefore, flash disks dedicated to portable electronic devices are becoming more and more popular. Such a flash drive not only provides a large memory capacity for the portable electronic device, but also is convenient for the user to carry. However, limited by the transmission speed of the data transmission interface of the portable electronic device, the data access speed of the flash drive is usually limited.

Therefore, there is a need for a method or system that can increase the access speed of a pen drive.

Accordingly, it is an object of the present invention to provide a storage device management system that can increase the speed of reading data.

Another object of the present invention is to provide a storage device management method that can increase data reading speed.

An embodiment of the present invention provides a storage device management system for managing a first storage device and a second storage device connected to an electronic device. The first storage device includes a regional temporary storage area and a global temporary storage area. The global temporary storage area is used for temporarily storing data that has been read from the second storage device, and the regional temporary storage area is used for temporarily storing data and other candidate data that have been read from the second storage device. The management system comprises: a storage device management program; and a control module for controlling the second storage device. If the storage device management program receives a read request from the second storage device to read a target data unit, it first confirms whether the global temporary storage area has the target data unit, and if the global temporary storage area has the The target data unit, the storage device management program causes the electronic device to read the target data unit from the global temporary storage area, and if the global temporary storage area does not have the target data unit, the storage device management program confirms that the area is temporarily stored. Whether the target data unit is present in the area, and if the target data unit is in the temporary storage area, the storage device management program causes the electronic device to read the target data unit from the temporary storage area of the area, if the temporary storage area of the area is not The target data unit, the storage device management program causes the electronic device to read the target data unit from the second storage device through the control module.

Another embodiment of the present invention provides a storage device management system for managing a cache memory in a mobile phone and a flash drive connected to the mobile phone, comprising: a control module for controlling the flash drive; and a a storage device management program, when the mobile phone reads a target data unit from the portable disk, the storage device management program causes the control module to copy the target data unit to the cache memory, and the mobile phone is self-contained The disc or the cache memory reads the target data unit.

Other embodiments of the present invention also disclose a storage device management method corresponding to the foregoing embodiment, and the steps thereof may be derived from the embodiments thereof, and thus are not described herein again.

According to the foregoing embodiment, by providing the temporary storage area in the electronic device, the speed at which the electronic device reads the data can be greatly improved, so as to improve the problem of slow reading speed of the data in the prior art.

In the following description, numerous embodiments are provided to illustrate the concepts of the invention. It should be noted, however, that in the following embodiments, the components may be implemented in a hardware manner (e.g., in a circuit) or in a hardware-software manner (e.g., writing a program in a processor). In addition, the following examples are merely illustrative, and the number, position, and order of operations of the elements are not intended to limit the invention.

FIG. 1 is a block diagram of a storage device management system in accordance with an embodiment of the present invention. As shown in FIG. 1, the electronic device 100 includes a storage device management program 101 and a first storage device 103 (for example, a cache memory in the electronic device 100, a cached RAM). The second storage device 105 (eg, a flash drive) is coupled to the electronic device 100 and includes a control module 107. The second storage device 105 can be removed from the electronic device 100. The storage device management program 101 can control the first storage device 103 and the second storage device 105 by using a file system module (for example, a FATFS file system module) corresponding to the file systems of the first storage device 103 and the second storage device 105. Data access or zoning action. The file system module can be installed in the second storage device 105, but can also be installed in the electronic device 100. In addition, the storage device management program 101 can be used to define the global temporary storage area 109 and the regional temporary storage area 111 in the first storage device 103, and manage the access operations of the global temporary storage area 109 and the regional temporary storage area 111. In one embodiment, the global temporary storage area 109 is used to temporarily store data that has been read from the second storage device 105, and the regional temporary storage area 111 is used to temporarily store data that has been read from the second storage device 105. And other candidate materials.

Moreover, the storage device management program 101 is also used to generate a read or write command to the control module 107, so that the control module 107 can transfer the data of the second storage device 107 to the first storage device 103 or write data. Go to the second storage device 107. The storage device management program 101 can be executed by a main processor, which can be the main processor of the electronic device 100 itself, that is, the main processor is used to control the electronic device in addition to the storage device management program 101. Other functions of the device 100, but the storage device management program 101 can also be executed by a processor independent of the main processor. The storage device management program 101 and the control module 107 can be regarded as a storage device management system. Please note that in the following embodiments, the control module is disposed in the second storage device, but the control module may also be disposed in the electronic device.

The electronic device 100 can be a portable electronic device, such as a mobile phone or a tablet computer. The first storage device 103 can be an internal storage device of the electronic device 100, such as a RAM (Random Access Memory). The internal storage device can be a storage device that is set when the electronic device 100 is shipped from the factory, and it is difficult to change its capacity. In addition, the second storage device 105 can be an external storage device independent of the electronic device 100, such as a flash drive, a memory card, or the like. Such an external storage device can be freely attached to or detached from the electronic device. Moreover, when the first storage device 103 is an internal storage device and the second storage device 105 is an external storage device, the data access speed of the first storage device 103 is higher than the data access speed of the second storage device 105.

In the prior art, if the data in the second storage device 105 is to be read, the data is directly read from the second storage device 105. As previously mentioned, the data reading speed is limited by the speed of the data transfer interface between the second storage device 105 and the electronic device 100. Therefore, one of the concepts of the present invention is to copy at least a portion of the data in the second storage device 105 to the global temporary storage area 109 or the regional temporary storage area 111 in the first storage device 103. When the data is read, the first storage device 103 is first checked whether there is data to be read, and if so, the first storage device 103 is preferentially read, and if not, the second storage device 105 is read. Can greatly reduce the time of data reading. The detailed steps will be explained below.

FIG. 2 is a flow chart of a storage device management method according to an embodiment of the invention, which includes the following steps:

Step 201

The electronic device 100 receives the read request.

For example, the user wants to read the target data unit in the second storage device 105 through the electronic device 100. The target data unit can be any form of data, for example, a file or an LBA (Logical Block Address). In the following embodiments, the target data unit is described as an LBA.

Step 203

It is confirmed whether the target data unit exists in the global temporary storage area 109, and if yes, go to step 205, otherwise, go to step 207.

In one embodiment, the global staging area 109 will contain data that has not yet been written as an archive (eg, an LBA) and data that has been written as an archive. In this embodiment, step 203 first confirms whether the target data unit is included in the non-archive data in the global temporary storage area, and if not, whether the file in the global temporary storage area contains the target data unit. Such a step can make the reading speed faster, because the confirmation of whether the file contains the target data unit, the action of opening the file, confirming the information contained therein, and then closing the file will increase the confirmation. Time required. Therefore, it is a priority to check whether the target data unit is included in the non-archive data.

Step 205

The target data unit is read from the global temporary storage area 109.

Step 207

It is confirmed whether or not the target data unit exists in the area temporary storage area 111, and if yes, go to step 209, otherwise, go to step 211.

Step 209

The target data unit is read from the area temporary storage area 111.

Step 211

The target data unit is read from the second storage device 105.

According to the steps in FIG. 2, the storage device management method provided in the present case preferentially reads data from the first storage device 103, and reads data from the second storage device 105 if the first storage device 103 does not. Therefore, the amount of data transmitted by the data transmission interface between the second storage device 105 and the electronic device 100 can be reduced, and the speed of data reading can be improved. In detail, when the electronic device 100 receives the read request for reading the target data unit from the second storage device 105, it first confirms whether the global temporary storage area 109 has the target data unit, and if so, from the global temporary storage area 109. The target data unit is read first, and if not, the target data unit is read from the area temporary storage area 111. If neither the global temporary storage area 109 nor the regional temporary storage area 111 has a target data unit, the data unit is read from the second storage device 105. In this way, it is not necessary to read the data from the second storage device 105 every time the data is to be read, and the reading speed of the data can be improved.

In the following embodiments, how to decide to temporarily store those data to the global temporary storage area 109 and the regional temporary storage area 111 will be described in detail, and the contents of the present invention will be better understood by referring to Figs. 2 and 3-4 together. By means of the temporary storage method described below, the global temporary storage area 109 and the regional temporary storage area 111 can store data that may be read, thereby enhancing the reading of data from the global temporary storage area 109 and the regional temporary storage area 111 instead of The efficiency of reading data from the second storage device 105.

In the embodiment of FIG. 3, it is assumed that the target data unit to be read is the data unit DU_3, and in the embodiment of FIG. 3, the global temporary storage area 109 and the regional temporary storage area 111 do not include the data unit DU_3. . In this case, in addition to reading the data unit DU_3 from the second storage device, the data unit DU_3 is also copied to the global temporary storage area 109 and the regional temporary storage area 111, and in addition to the data unit DU_3, the non-target is At least one candidate data unit outside the data unit is copied to the regional temporary storage area 111, for example, the data unit DU_1-DU_2 in FIG. 3, and the data unit DU_4-DU_100, that is, the data unit in the address range of the data unit DU_3. The advantage of taking this mechanism is that since the data unit may not be read separately, it may be read continuously. For example, when reading a file, the data units adjacent to the storage address are continuously read. Therefore, the data unit within the address range of the data unit DU_3 is first copied to the area temporary storage area 111 to reduce the possibility of reading data directly from the second storage device 105. After such a copy operation, the global temporary storage area 109 and the regional temporary storage area 111 each include the data unit DU_3. Therefore, if the data unit DU_3 is to be read again, according to the steps of FIG. 2, the global temporary storage area will be directly The data unit DU_3 is read 109 without having to read from the second storage device 105.

The embodiment of Fig. 4 is continued after the embodiment of Fig. 3, that is, in the embodiment of Fig. 4, the global temporary storage area 109 contains the data unit DU_3, and the regional temporary storage area 111 contains the data unit DU_1- DU_100. In the embodiment of Fig. 4, the target data unit to be read is the data unit DU_4. According to the steps in FIG. 2, it is first confirmed whether the global temporary storage area 109 has the data unit DU_4, but since the global temporary storage area 109 does not contain the data unit DU_4, it is confirmed whether the regional temporary storage area 111 has a data unit. DU_4. The area temporary storage area 111 includes the data unit DU_4, so the data unit DU_4 is read from the area temporary storage area 111, and the data unit DU_4 is copied from the area temporary storage area 111 to the global temporary storage area 109.

As described above, if the target data unit is read from the area temporary storage area 111 or the second storage device 105, the target data unit is copied to the global temporary storage area 109. Therefore, the present invention further provides an embodiment of writing data to the global temporary storage area 109, which can further speed up the reading of data. FIG. 5 is a flow chart showing the writing of data to the global temporary storage area according to an embodiment of the present invention. The present invention can be better understood by referring to FIG. 3 and FIG. In an embodiment, the global temporary storage area 109 in FIG. 3 further includes a global temporary buffer 109_1 and a global temporary storage area 109_2, and the global temporary buffer 109_1 is used to store non-archive data. The global temporary file area 109_2 stores files. The flowchart of Figure 5 contains the following steps:

Step 501

A write command to write data to the global temporary storage area 109 is received. For example, the target data unit is copied to the global temporary storage area 109 as described above, and the control module 107 of FIG. 1 receives the write command generated by the storage device management program 101.

Step 503

Confirm if there is enough space in the global scratch buffer 109_1. If yes, go to step 505, otherwise go to step 507.

Step 505

The data is written to the global temporary buffer 109_1 as a non-file.

Step 507

Confirm if there is enough space in the global temporary file area 109_2. If yes, go to step 509, otherwise go to step 511.

Step 509

The data is written to the global temporary file area 109_2 in the form of a file.

Step 511

If the global temporary buffer 109_1 and the global temporary storage area 109_2 do not have sufficient storage space, it means that the storage space of the global temporary storage area 109 is relatively low. In this case, the data of the global temporary storage area 109 can be deleted. This deletion action may delete all the data stored in the global temporary storage area 109, or may delete only part of the data stored in the global temporary storage area 109. For example, only the older data in the global temporary storage area 109 can be deleted.

In an embodiment, steps 507-511 may be replaced by writing at least a portion of the data stored in the global temporary buffer 109_1 as a file and storing it in the global temporary storage area 109_2 to release a partial global temporary buffer. The space of the area 109_1 and the new data is written to the global temporary buffer 109_1.

As mentioned above, if the data is saved as a file, the file must be opened, read, and then closed when searching for information, which will reduce the speed of accessing the data. Therefore, in the global temporary storage area writing process in FIG. 5, the data is preferentially stored in a non-archive format, which can improve the speed of reading data in the global temporary storage area.

In an embodiment, since the global temporary storage area 109 and the regional temporary storage area 111 contain a fixed space, the present invention further provides for deleting the data stored in the global temporary storage area 109 or the regional temporary storage area 111 in a specific case. The embodiment avoids insufficient space of the global temporary storage area 109 and the regional temporary storage area 111. As shown in the embodiment of FIG. 5, if the global temporary buffer 109_1 and the global temporary storage area 109_2 do not have sufficient storage space, the data in the global temporary storage area 109 is deleted. In addition, in an embodiment, if the second storage device 105 is removed from the electronic device 100, the data stored in the global temporary storage area 105 cannot correspond to another storage device, and thus the global temporary storage area 109 is deleted. Information in the middle.

In another embodiment, if a file containing the required data unit is read from the area temporary storage area 111, the global temporary storage area 109, or the second storage device 105, the deleted area temporary storage area 111 is stored. Candidate data unit. Taking the embodiment of FIG. 3 as an example, if a file A includes the data unit DU_3-DU_50, after reading the data unit DU_3, the remaining DU_4-DU_50 is read again according to the flow in FIG. After the file A is read, since the candidate data unit stored in the area temporary storage area 111 is a data unit related to the file A, the candidate data unit stored in the area temporary storage area 111 is deleted.

The user may modify the originally stored data in the second storage device 105, and then save the modified data back to the second storage device 105. In an embodiment, in this case, the global temporary storage area 109 and the regional temporary storage area 111 are simultaneously updated to synchronize the data. Please refer to FIG. 6 , which is a schematic diagram of operations when modifying data of a second storage device according to an embodiment of the invention. As shown in FIG. 6, after the required data unit DU_1 is read, according to the foregoing embodiment, the required data unit DU_1 is read from the second storage device 105, the global temporary storage area 109 or the regional temporary storage area 111. The global temporary storage area 109 and the regional temporary storage area 111 all have the required data unit DU_1. If the content of the required data unit DU_1 is changed, and is modified into the modified data unit DU_1a, and returned to the second storage device 105 to replace the original required data unit DU_1, the modified data unit DU_1a is modified. It must be stored in the global temporary storage area 109 and the regional temporary storage area 111 at the same time to replace the original required data unit DU_1. Otherwise, when the modified data unit DU_1a is read next time, the original required data unit DU_1 is read from the global temporary storage area 109 or the regional temporary storage area 111 instead of the modified required data unit DU_1a.

In an embodiment, after the required data unit DU_1 is read out and modified into the modified data unit DU_1a, it is determined whether the required data unit DU_1 exists in the regional temporary storage area 111. If the result is yes, then The modified data unit DU_1a is replaced with the required data unit DU_1 in the area temporary storage area 111. Similarly, it is also determined whether the required data unit DU_1 exists in the global temporary storage area 109. If the result is YES, the modified required data unit DU_1a replaces the required data unit DU_1 in the global temporary storage area 109.

In an embodiment, the global temporary storage area 109 includes the foregoing global temporary buffer 109_1 (non-archive data area) and the global temporary storage area 109_2 (archive data area), and the modified data unit DU_1a is to be modified. When updating to the global temporary storage area 109, it is first confirmed whether the global temporary buffer 109_1 has the required data unit DU_1, and if so, the modified required data unit DU_1a replaces the required data unit in the global temporary buffer 109_1. DU_1. If the global temporary buffer 109_1 does not have the required data unit DU_1 but the global temporary storage area 109_2 has the required data unit DU_1, the modified required data unit DU_1a replaces the required data unit in the global temporary storage area 109_2. DU_1. As described in the step of Figure 5 of the present case, since the global temporary buffer 109_1 is insufficient in space before the required data unit is written to the global temporary buffer 109, the global temporary storage area 109_2 still has space. . Therefore, the required data unit DU_1 may exist in the global temporary storage area 109_2 and not in the global temporary buffer 109_1.

As described above, when reading the data of the second storage device, the prior art reads the data directly from the second storage device, and thus does not change to the first storage device in the electronic device. Therefore, if an electronic device utilizes the storage device management method provided by the present invention, when the second storage device is read, the data of the first storage device in the electronic device increases correspondingly. FIG. 7 is a diagram showing the manner in which the storage device management system or the storage device management method provided by the present invention is actually used according to an embodiment of the present invention.

FIG. 7 is a diagram showing the manner in which the storage device management system or the storage device management method provided by the present invention is actually used according to an embodiment of the present invention. In the example of FIG. 7, the first storage device is an internal storage device, and the second storage device is an external storage device. As shown in FIG. 7, the electronic device 700 can be configured to display a configuration screen of a storage space, which displays an internal storage space and an external storage space. When reading the data of the external storage device, since the data is temporarily stored in the first storage device, the internal storage space may increase correspondingly. As described above, in an embodiment, if the second storage device is removed from the electronic device, the data stored in the global temporary storage area 109 and the regional temporary storage area 111 is deleted. Therefore, if the second storage device is removed from the electronic device, there may be a situation in which the internal storage space is correspondingly reduced. The internal storage space variation caused by the foregoing embodiment can be derived from the description of FIG. 7, and will not be described again.

According to the foregoing embodiment, by providing the temporary storage area in the electronic device, the speed at which the electronic device reads the data can be greatly improved, so as to improve the problem of slow reading speed of the data in the prior art. The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

100‧‧‧Electronic devices

101‧‧‧Storage Management Program

103‧‧‧First storage device

105‧‧‧Second storage device

107‧‧‧Control Module

109‧‧‧Global temporary storage area

109_1‧‧‧Global buffer buffer

109_2‧‧‧Global Temporary File Area

111‧‧‧Regional storage area

700‧‧‧Electronic devices

DU1-DU_100‧‧‧data unit

DU_1a‧‧‧Modified data unit

FIG. 1 is a block diagram of a storage device management system in accordance with an embodiment of the present invention. FIG. 2 is a flow chart of a storage device management method according to an embodiment of the invention. Figure 3-4 is a schematic diagram showing the operation of the storage device management system according to an embodiment of the present invention. FIG. 5 is a flow chart showing writing data to a global temporary storage area according to an embodiment of the invention. FIG. 6 is a schematic diagram showing the operation of modifying the data of the second storage device according to an embodiment of the invention. FIG. 7 is a diagram showing the manner in which the storage device management system or the storage device management method provided by the present invention is actually used according to an embodiment of the present invention.

Claims (30)

A storage device management method is applied to a first storage device and a second storage device connected to an electronic device, the first storage device includes a regional temporary storage area and a global temporary storage area, wherein the global temporary storage area is used for The data stored in the second storage device is temporarily stored, and the temporary storage area is used to temporarily store the data and other candidate materials that have been read from the second storage device. The storage device management method includes: (a) Receiving a read request for reading a target data unit from the second storage device; (b) confirming whether the global temporary storage area has the target data unit; (c) if the global temporary storage area has the target data unit, And reading the target data unit from the global temporary storage area, if the global temporary storage area does not have the target data unit, confirming whether the target temporary storage area has the target data unit; and (d) if the regional temporary storage area If the target data unit is present, the target data unit is read from the temporary storage area of the area, and if the target data unit is not in the temporary storage area of the area, the target data unit is read from the second storage device. The storage device management method of claim 1, wherein the first storage device is an internal storage device inside the electronic device, and the second storage device is an external storage device independent of the electronic device. The storage device management method of claim 1, wherein the step (b) further comprises: first confirming whether the target data unit is included in the non-archive data in the global temporary storage area, and if not, reconfirming the global temporary storage. Whether the file in the zone contains the target data unit. The storage device management method of claim 1, further comprising: if the target data unit is read from the regional temporary storage area or the second storage device, copying the target data unit to the global temporary storage area. The storage device management method according to claim 4, wherein the global temporary storage area comprises a global temporary storage buffer and a global temporary storage file area, wherein the global temporary storage buffer stores non-archive data, and the global temporary storage The file area stores the file; wherein when the target data unit is copied to the global temporary storage area, it is first confirmed whether the global temporary storage buffer has sufficient space, and if so, the target data unit is copied to the global temporary storage buffer. If there is no, confirm whether there is enough space in the global temporary file area. If there is enough space in the global temporary file area, copy the target data unit to the global temporary file area. The storage device management method according to claim 4, wherein the global temporary storage area comprises a global temporary storage buffer and a global temporary storage file area, wherein the global temporary storage buffer stores non-archive data, and the global temporary storage The file area stores the file; wherein when the target data unit is copied to the global temporary buffer, it is first confirmed whether the global temporary buffer has sufficient space, and if so, the target data unit is copied to the global temporary storage. The buffer, if not, first converts at least a portion of the data in the global temporary buffer into at least one file and stores the data in the global temporary storage area, and then stores the target data unit in the global temporary storage buffer. The storage device management method of claim 4, further comprising: deleting the data stored in the global temporary storage area if the second storage device is detected to be removed from the electronic device. The storage device management method of claim 1, further comprising: after reading the target data unit from the second storage device, copying at least one candidate data unit including the target data unit to the regional temporary storage area. The storage device management method of claim 8, further comprising: deleting the area from the temporary storage area of the area, the global temporary storage area, or the second storage device after reading a file including the required data unit The candidate data units stored in the temporary storage area. The storage device management method of claim 1, further comprising: modifying the read required data unit into a modified required data unit, and writing the modified required data unit to the second storage device When the required data unit is replaced, if the area temporary storage area or the global temporary storage area has the modified data unit, the modified data unit is also written into the regional temporary storage area or the global area. The temporary storage area replaces the required data unit. A storage device management method, using a cache memory in a mobile phone and a flash drive connected to the mobile phone, comprising: copying the target data unit to the cache when reading a target data unit from the portable disk Memory; and reading the target data unit from the flash drive or the cache memory. The storage device management method of claim 11, further comprising deleting at least a portion of the internal storage data stored in the cache memory if the removable disk is detected to be removed from the mobile phone. The storage device management method of claim 11, wherein the copying the target data unit to the cache memory comprises: copying a plurality of candidate data units including the target data unit to the cache memory. The storage device management method of claim 13, further comprising: deleting the candidate data stored in the cache memory after reading the data including the required data unit from the cache memory or the flash drive unit. The storage device management method of claim 11, further comprising: modifying the read required data unit into a modified required data unit, and replacing the modified required data unit into the flash drive In the case of the required data unit, the modified data unit is also written into the cache memory to replace the required data unit. A storage device management system for managing a first storage device and a second storage device connected to an electronic device, the first storage device comprising a regional temporary storage area and a global temporary storage area, wherein the global temporary storage area is used To temporarily store the data that has been read from the second storage device, and to temporarily store the data and other candidate data that has been read from the second storage device, the storage device management system includes: a device management program; a control module for controlling the second storage device; wherein the storage device management program first confirms the global domain if it receives a read request from the second storage device to read a target data unit Whether the target data unit is present in the temporary storage area, and if the global temporary storage area has the target data unit, the storage device management program causes the electronic device to read the target data unit from the global temporary storage area, if the global temporary storage If the target data unit is not in the area, the storage device management program confirms whether the target data unit is in the temporary storage area of the area, and if the target temporary storage area has the target data And the storage device management program causes the electronic device to read the target data unit from the temporary storage area of the area, and if the target temporary storage area does not have the target data unit, the storage device management program causes the electronic device to pass the control The module reads the target data unit from the second storage device. The storage device management system of claim 16, wherein the first storage device is an internal storage device inside the electronic device, and the second storage device is an external storage device independent of the electronic device. The storage device management system of claim 16, wherein the storage device management program first confirms whether the target data unit is included in the non-archive data in the global temporary storage area, and if not, confirms the global temporary storage area. Whether the file contains the target data unit. The storage device management system of claim 16, wherein if the target data unit is read from the regional temporary storage area or the second storage device, the storage device management program copies the target data unit to the global temporary Storage area. The storage device management system of claim 19, wherein the global temporary storage area comprises a global temporary storage buffer and a global temporary storage file area, wherein the global temporary storage buffer stores non-archive data, and the global temporary storage The file area stores the file; wherein when the target data unit is copied to the global temporary storage area, the storage device management program first confirms whether the global temporary buffer has sufficient space, and if so, copies the target data unit to The global temporary buffer, if not, confirms whether the global temporary storage area has sufficient space, and if the global temporary storage area has sufficient space, the target data unit is copied to the global temporary storage area. The storage device management system of claim 19, wherein the global temporary storage area comprises a global temporary storage buffer and a global temporary storage file area, wherein the global temporary storage buffer stores non-archive data, and the global temporary storage The file area stores the file; wherein when the target data unit is copied to the global temporary buffer, the storage management program first confirms whether the global temporary buffer has sufficient space, and if so, copies the target data unit Go to the global temporary buffer, if not, convert at least a part of the data in the global temporary buffer into at least one file and store it in the global temporary storage area, and then store the target data unit in the global area. The scratch buffer. The storage device management system of claim 19, further comprising: if the storage device management program detects that the second storage device is removed from the electronic device, deleting the data stored in the global temporary storage area. The storage device management system of claim 16, after the electronic device reads the target data unit from the second storage device, the storage device management program copies at least one candidate data unit including the target data unit to The temporary storage area of the area. The storage device management system of claim 23, wherein the electronic device stores the file from the area temporary storage area, the global temporary storage area, or the second storage device after reading a file containing the required data unit The device manager deletes the candidate data units stored in the temporary storage area of the area. The storage device management system of claim 16, wherein the required data unit is modified to be a modified required data unit, and the modified required data unit is written to the second storage device to replace the In the case of the required data unit, if the area temporary storage area or the global temporary storage area has the modified data unit, the storage device management program also writes the modified required data unit to the regional temporary storage area or The global temporary storage area replaces the required data unit. A storage device management system for managing a cache memory in a mobile phone and a flash drive connected to the mobile phone, comprising: a control module for controlling the flash drive; and a storage device management program, the mobile phone To read a target data unit from the flash drive, the storage device management program causes the control module to copy the target data unit to the cache memory and read the mobile phone from the flash drive or the cache memory. Take the target data unit. The storage device management system of claim 26, wherein the storage device management program deletes at least a portion of the internal stored data stored in the cache memory if the removable device is detected to be removed from the mobile phone. The storage device management system of claim 26, wherein the copying the target data unit to the random access memory comprises: copying a plurality of candidate data units including the target data unit to the cache memory. The storage device management system of claim 28, wherein after the electronic device reads the data including the required data unit from the cache memory or the flash drive, the storage device management program deletes the cache memory The candidate data units are stored. (1) The storage device management system of claim 26, wherein the storage device management program is modified if the required data unit is modified into a modified data unit and is written to the flash drive to replace the required data unit The modified data unit is also written to the cache memory to replace the required data unit.