JP3198192U - Reading device, writing device and copying device - Google Patents

Abstract

Provided are a reading device and a writing device for reading and writing data in units of data suitable for the characteristics of a hard disk storage device, and a hard disk storage device copying device capable of shortening the data copy time. When copying data from a master hard disk storage device MH to target hard disk storage devices TH1 to TH3, the amount of data that can be read / written by one command at the beginning of the copying process is set as one data unit. Then, this data unit is changed, copy processing is performed, and copy time in each data unit is measured. Then, by copying the remaining data using the data unit having the shortest copy time, the copy can be completed in a shorter processing time. [Selection] Figure 1

Description

  The present invention relates to a device for transferring data recorded in a storage device used in an electronic computing device such as a personal computer to another storage device, and more specifically, a reading device capable of transferring data in accordance with the characteristics of the storage device. The present invention relates to a writing device and a copying device.

  Conventionally, as a storage device mounted on a personal computer or the like, for example, there is a hard disk storage device having a large storage capacity and a relatively short access time. This hard disk storage device is used, for example, as a storage device for storing software such as an operation system of a personal computer. When manufacturing and shipping a large number of personal computers, the hard disk storage device includes the system described above. Work to write software.

  Conventionally, in order to write data to such a hard disk storage device, a hard disk storage device (copy source storage device: master HDD) in which system software necessary for the use of a personal computer is written is created. The data is physically copied to a plurality of hard disk storage devices (copy destination storage devices: target HDDs) loaded in the personal computer. Specifically, a predetermined amount of data is read in units of sectors from a predetermined reading start position of the master HDD, transferred to the target HDD, written in order from the corresponding address of the target HDD, and first for the next copy. The operation of reading a predetermined amount of data from the address next to the data read in is repeated.

  As a device for copying data in such a hard disk storage device, for example, there is a device described in the following prior patent document.

JP 2008-108410 A JP 2005-92373 A

  By the way, the applicant has developed a copy device for a hard disk storage device and has copied data of many types of hard disk storage devices. There was a problem that there was a difference in the time until the copying of was completed. When this reason is analyzed, there is a characteristic in the relationship between the amount of data of read processing or write processing executed by a single command, which is a unit for transferring data, and the time when read processing or write processing ends. It was found that this characteristic differs depending on the type of hard disk storage device.

  That is, as shown in FIG. 7, the horizontal axis represents the number of sectors representing the amount of data (data amount transferred by one write or read command) at the time of reading or writing each time, the vertical axis As the time until the processing is completed by one command every time, there is no common correlation between the number of sectors and the processing time between different hard disk storage devices (for example, transfer As the number of sectors to be increased, the processing time does not necessarily increase.) Different relationships are shown depending on the types A to C of the hard disk storage device. That is, the number of sectors with the shortest processing time differs depending on the type of hard disk storage device.

  However, in the conventional copying apparatus, the amount of data sent by data transfer by one ride command (or read command) is fixed in advance, so that a storage device having the same capacity may be used depending on the type of hard disk storage device. Even so, the processing time may become longer. In particular, in recent years, the capacity of hard disk storage devices has increased, and the difference in processing time for one read / write has caused a large difference in the time required to complete the copy processing of all data.

  An object of the present invention is to provide a copying apparatus for a hard disk storage device that can shorten the data copy time by reading and writing data in units of data suitable for the characteristics of the hard disk storage device.

The present invention for solving the above problems has the following configuration.
(1) a connection terminal connected to the storage device;
A data reading device having reading means for reading data for each predetermined unit data from a storage device connected to the connection terminal,
Unit data storage means for storing a plurality of unit data having different data amounts;
Using each unit data stored in the unit data storage means, a processing time measuring means for measuring a processing time when reading a certain amount of data for each unit data,
Processing time storage means for storing the processing time measured by the processing time measuring means for each unit data;
Unit data determining means for determining unit data having the shortest processing time among the processing times stored in the processing time storage means;
A reading apparatus comprising: a reading execution unit that executes a reading process from the storage device using the unit data determined by the unit data determining unit.

(2) a connection terminal connected to the storage device;
A data writing device having writing means for writing data for each predetermined unit data in a storage device connected to the connection terminal,
Unit data storage means for storing a plurality of unit data having different data amounts;
Using each unit data stored in the unit data storage means, a processing time measuring means for measuring the processing time when writing a certain amount of data for each unit data,
Processing time storage means for storing the processing time measured by the processing time measuring means for each unit data;
Unit data determining means for determining unit data having the shortest processing time among the processing times stored in the processing time storage means;
A writing device comprising: a writing execution unit that executes a subsequent writing process to the storage device using the unit data determined by the unit data determining unit.

(3) a first connection terminal connected to the copy source storage device, a second connection terminal connected to the copy destination storage device,
Reading means for reading data for each predetermined unit data from the copy source storage device;
Address storage means for storing the address in the physical format of the reading start position of the data read from the copy source storage device;
A writing unit for writing the data read by the reading unit to the copy destination storage device from the same address position as the address stored in the address storage unit is provided, and the copying process is performed by writing the data read by the reading unit by the writing unit. A copying machine to perform,
Unit data storage means for storing a plurality of types of unit data for reading data from the copy source storage device and writing data to the copy destination storage device in one command as unit data having different data amounts;
Pre-processing means for executing a copying process of a predetermined amount of data using a plurality of unit data stored in the unit data storage means during the copying process;
Processing time measuring means for measuring the processing time of each unit data processed by the preliminary processing means;
Processing time storage means for storing the processing time measured by the processing time measuring means for each unit data;
Unit data determination means for comparing processing times stored in the processing time storage means and determining unit data having the shortest processing time as unit data used for copying processing;
A copying apparatus comprising: a copying unit that executes a copying process using the unit data determined by the unit data determining unit.

(4) The copying apparatus according to (3), wherein a plurality of the second connection terminals are provided, and the writing unit writes the read data to a plurality of copy destination storage devices.

  According to the first aspect of the present invention, when a predetermined amount of data is read from the storage device, a plurality of unit data having different data amounts are stored in the unit data storage means, and each unit data stored is stored. The reading processing time when reading the same amount of data is stored for each unit data. The unit data of the shortest processing time is extracted from the stored processing times and used as unit data used for the subsequent reading process. Thus, by selecting unit data having a short processing time and adopting it as unit data used for the reading process, the data reading time can be shortened.

  According to the second aspect of the present invention, when a predetermined amount of data is written in the storage device, a plurality of unit data having different data amounts are stored in the unit data storage means, and each unit data stored is stored. The write processing time when the same amount of data is read is stored for each unit data. The unit data of the shortest processing time is extracted from the stored processing times and used as unit data used for the subsequent writing processing. Thus, by selecting unit data having a short processing time and adopting it as unit data used for the writing process, the data writing time can be shortened.

  According to the invention described in claim 3, the processing time is measured for each data unit to be copied by one command, and the data is copied to the copy destination storage device in the data unit having the shortest processing time. Copy time can be shortened.

  According to the invention described in claim 4, when there are a plurality of copy destination storage devices, the storage capacity of the copy destination is further expanded, and therefore the difference in copy time that can be processed by one command is the same for all the copy destinations. This is particularly useful when used in such a copying apparatus because it greatly affects the time required to complete copying to a storage device.

1 is a block diagram showing a configuration of a copying apparatus according to the present invention. It is a main flowchart of a copy process. It is a flowchart which shows a unit data determination routine. It is a flowchart which shows a copy process routine. It is a flowchart which shows the unit data determination routine in the other structural example. It is a flowchart which shows the unit data determination routine in the other structural example. It is a graph which shows the magnitude | size of the data amount of unit data, and the characteristic for every hard disk storage device of processing time.

  Hereinafter, preferred embodiments of the present invention will be described in detail. FIG. 1 is a block diagram showing the configuration of the copying apparatus of the present invention. The copying apparatus 1 writes the data read from the master hard disk storage device MH, which is the copy source hard disk storage device, to the target hard disk storage device TH, which is the copy destination hard disk storage device, and from the master hard disk storage device MH to the target hard disk storage device TH. This is a mirror copy device.

The copying apparatus 1 is a processing device 20 (CPU: Central Processing Unit), memories 31 to 33 that temporarily store data read from the hard disk storage device, and a first connection terminal connected to the master hard disk storage device MH. A connection terminal 4M and connection terminals 4T1 to 4T3 which are second connection terminals connected to the target hard disk storage devices TM1 to TM3 are provided. Control circuits CPU21 to CPU23 for relaying data transfer to the target hard disk storage devices TH1 to TH3 connected thereto are connected to the connection terminals 4T1 to 4T3, respectively.
The CPU 20, the memories 31 to 33, the connection terminal 4 </ b> M to be connected, and the CPUs 21 to 23 are connected by the bus line 5.

  The CPUs 20 to 23 read and write data by outputting commands to the hard disk storage device. The hard disk storage device in this embodiment is, for example, 48 bit LBA standard. The CPU 20 reads (or writes) a fixed amount of data determined by a single command output, and reads (or writes) data sequentially by repeatedly outputting commands. A block of data transferred by the output of this command is defined as unit data.

  The CPU 20 stores a plurality of data amounts to be read (or written) by one command, and outputs a read command or a write command simultaneously with an address for starting read or write and a data amount to be read or written. By doing so, data in the hard disk storage device is specified. For example, the read command “Read LBA0LBC256” reads from the 0th sector (the first sector in the LBA standard) to the 256th sector in order, and the corresponding write command is “Write LBA0LBC256”. , From the 0th sector (the first sector in the LBA standard) to the 256th sector in order. The next read command to be issued is “Read LBA256LBC512”, and the write command is “Write LBA256LBC512”. In this way, every time a read command is issued, data is read in order without leaving a gap. Further, by issuing a write command corresponding to the read command, data is copied to the target hard disk storage device at the same address as the master hard disk storage device. As with reading, data is written sequentially.

In addition to 256 sectors, for example, 2048 sector, 8192 sector, 16384 sector, 65536 sector and the like are included as the data amount of unit data from which data is read (or written) by a single command. These values are determined in advance and stored in the memory in the CPU 20.
When the CPU 20 starts a copying operation from the master hard disk storage device MH to the target hard disk storage devices TH1 to TH3, the CPU 20 first changes the data amount to be copied by one command, and determines a predetermined specific amount of data amount. Then, the copying operation is performed. At this time, the processing time when copying is performed for each data unit (the time until copying is completed) is stored, and the unit data with the shortest time among the stored processing times is determined. Using the single unit data, the remaining data in the hard disk storage device is copied.

  More specifically, when copying, a plurality of data units are extracted from the above-described data units (for example, three: 256 sectors, 16384 sectors, 65536 sectors), and a specific amount of data is stored in each data unit. Duplicate. The specific amount of data may be, for example, a common multiple of each data amount with respect to unit data having a different data amount. Based on the above-described example, when the data usage of the unit data is 256 sectors, 16384 sectors, and 65536 sectors, the value is preferably an integer multiple of 65536 sectors.

  This copy data is data read from the master disk drive. Then, the processing time (the time when copying is completed in one of the target hard disk storage devices TH1 to TH3) when copying the same amount (specific amount) of data in each unit data is stored, and each unit used for copying Compare the elapsed time in the data. Among these, the unit data having the shortest time is determined as the unit data for the subsequent copying process.

  The processing procedure of the present invention will be described below based on the flowchart. FIG. 2 is a flowchart showing a main routine in the copying process. Initialization is performed to clear data stored in the previous processing, and information related to the connected storage device, for example, information (storage capacity) obtained by issuing an IDENTIFY DEVICE command is acquired (step S101). ).

A unit data determination routine is executed (step S103). The unit data determined by the unit data determination routine is transferred for each command output, and the copying process of the data in the remaining area is started (step S105). It is determined whether a predetermined amount of data has been copied (step S107). If the predetermined amount of data has been copied, the unit data determination routine is executed again (step S109). This is because the processing time of the reading process and the writing process may vary depending on the position of the head with respect to the disk in the hard disk device. If the processing time of other unit data is shortened after remeasurement, the unit data is changed.
The unit data determined in step S109 is transferred every time a command is output, and the copying process of the remaining area data is started (step S111). The main routine ends when the copy process is completed in the copy process routine (step S111).

  The predetermined amount in step S107 is calculated in step S101, such as an amount of one third, one second, or two thirds of the storage capacity acquired in step S101. Alternatively, a predetermined amount (for example, every 10 gigabytes, every 20 gigabytes, every 100 gigabytes, every 500 gigabytes, etc.) may be used regardless of the connected storage device. Further, the time (processing time) from the start of reading from the master hard disk storage device to the end of writing the read data to the target hard disk storage device is monitored at a predetermined interval by one command. The configuration may be such that step S109 is executed when the time becomes longer by a predetermined ratio (for example, 10% to 30%) than when the copy is started. Or, the copy processing time of a specific amount of data is detected either periodically or randomly, and compared with each processing time when the copy processing is initially performed with a plurality of unit data, one of the processing times of other unit data It may be a case where it becomes longer. In step S105 or S111, a data transfer step and a transfer step are configured.

  FIG. 3 is a flowchart showing a unit data determination routine of the present invention. As described above, the CPU 20 stores a plurality of unit data having different data amounts. One of the stored unit data is selected (step S201). Thereafter, the timer is turned on and measurement of the processing time is started (step S203). A read command is issued to the master start hard disk storage device MH (step S205). By issuing this command, the data amount (for example, 256 sectors) of the unit data determined in step S201 is read. The read unit data is stored in the memory 31 (step S207). It is determined whether the read data has been accumulated (step S209). If the accumulation has been completed, a write command is issued to the target hard disk storage device TH1 (step S211).

The unit data is written by issuing the write command, and it is determined whether the writing is completed (step S215). When writing of unit data is completed, it is determined whether writing of a predetermined data amount that is predetermined for measuring the processing time is completed (step S217), and when not completed, step S205 is performed. Migrate to When the writing of the predetermined amount of data is finished, the time elapsed until the writing is finished is stored (step S219). The elapsed time is stored for each unit data having a different data amount.
The predetermined data amount in step S217 is preferably a common multiple of the data amount of each unit data.

  Next, for all unit data stored in advance, steps S201 to 219 are completed, and it is determined whether the measurement of the processing time of each unit data is completed (step S221). If not completed, the process returns to (Step S201), and the processing time is measured for the unit data whose processing time has not been measured.

  When the processing time has been measured for all the unit data, one unit data used for copying the remaining data is selected (step S223). This unit data is the unit data having the shortest processing time. After one unit data used for the copying process is determined, the process is returned to the main routine.

  The unit data for measuring the processing time in this unit data determination routine may not be all stored unit data, but may be two or more unit data selected from a plurality of stored unit data. I just need it. In steps S201 to S221 described above, a measurement step is configured. In addition, a unit data selection step is configured in step S201, a transfer time measurement step is configured in steps S203 to S219, and a shortest unit data determination step is configured in step S223. In step S223, a unit data determination step is configured.

  Further, preliminary processing means are configured by steps S201 and S205 to S217, processing time measuring means and processing time storage means are configured by steps S203 and S219, and unit data determining means is configured by step S223.

Next, the copy processing routine will be described based on the flowchart shown in FIG.
A target copy data amount is acquired (step S300). The target copy data amount is the total amount of data copied by this copy processing routine. In the copy processing routine executed in step S105, the predetermined amount in step S107, and in the copy processing routine executed in step S111, the remaining data amount is obtained by subtracting the predetermined amount in step S107 from the total copy data amount. If unit data is not redetermined (in this case, step S109 and step S111 are omitted), the total copy data amount is stored, and all data stored in the storage device is copied. In this case, it corresponds to the storage capacity of the copy source storage device.

  A data amount (accumulated data amount) to be transferred to the memory 31 for accumulating the read data is determined (step S301). When the data amount of unit data when reading from the master hard disk storage device is the same as the data amount of unit data when writing to the target hard disk storage device, this predetermined amount is the same as the data amount of the unit data or an integer. The amount is doubled.

  A read command is issued (step S303). As described above, the read command defines the address at which reading is started and the amount of data read from the address. It is determined whether the read data is stored in the memory 31 and all the read data is accumulated in the memory 31 (step S305). If accumulated, it is determined whether or not the predetermined accumulated data amount determined in step S301 has been reached (step S307). If not, the process returns to step S303 to issue a read command again to store the data. read. For example, when the read command issued first is “Read LBA0LBC256”, the CPU 20 stores the address “LBA0”, and uses the value obtained by adding the amount of unit data to the address as the next address. The command issued to is “Read LBA256LBC512”. The CPU 20 that issues such a command constitutes an address storage means.

  If it has reached, a write command is issued to the target hard disk storage device (step S309). The address of the read command issued when the data stored in the memory 31 is read is stored, and the data is written from the same address as the address where the reading is started. It is determined whether writing by issuing a write command has been completed (step S311). If it has been completed, it is determined whether the predetermined accumulated data amount determined in step S301 has been reached (step S313). In step S309, the write command is issued again to write subsequent data. The execution of this step S313 is not performed, the number of read commands issued until it is determined in step S307 that the predetermined accumulated data amount has been reached and the address are stored, and the same number of write commands are issued. It is good also as composition to do.

It is determined whether the target copy data amount acquired in step S300 has been reached (step S315). If the target copy data amount has not been reached, read / write processing (copy processing) is executed again from step S303. If so, the process returns to the main routine.
The memory 31 for storing the read data is a dual port memory, and the data read from the master hard disk storage device is input from one port a of the memory, the data is stored, and a write command is issued. When writing to the target hard disk storage device, data is supplied from the port a to the target hard disk storage device.

Here, the next read command is issued, overlapping the issuance of the write command, and the read data is accumulated in the other port b. That is, while the data is supplied from the port a to the target hard disk storage device, the read data is accumulated in the port b. In this way, accumulation of read data and discharge of write data are performed simultaneously at the two ports. The CPU 20 that issues the read command and the write command constitutes reading means and writing means, and unit data storage means. Further, the copying means is constituted by the copying processing routine.
The embodiment described above is an embodiment when the unit data for reading data from the master hard disk storage device MH and the unit data for writing the read data to the target hard disk storage device TH are the same.

Next, the copying process when the unit data in the reading process is different from the unit data in the writing process will be described based on the flowchart of the unit data determining routine shown in FIGS.
One unit data is selected from a plurality of unit data stored in advance (step S401). Next, measurement of processing time is started (step S403). With the unit data selected in step S401, a read command is issued to the master hard disk storage device MH (step S405). The read data that has been read is stored in the memory 31 (step S407). When the accumulation of the data read by the read command is completed (step S409), it is determined whether or not reading of a predetermined amount of data predetermined for measuring the processing time is completed (step S411). If not completed, the processing from step S405 to step S409 is repeated. When the reading of the predetermined data amount is completed, the time measurement from step S403 is terminated, and the elapsed time is stored in association with the data amount of the unit data (step S413).

Steps S403 to S413 constitute processing time measuring means and processing time storage means, and steps S301 to S307 constitute reading execution means.
Next, a process of writing a predetermined amount of data stored in the memory 31 to the target hard disk storage device is performed.
Time measurement is started (step S415), and a write command is issued to the target hard disk storage device (step S417). The write command instructs to start writing from the same address as that specified by the read command issued in step S405.

  Data is output to the target hard disk storage device by the write command (step S419). It is determined whether the writing of data by the write command has been completed (step S421). If the writing has been completed, it is determined whether the writing of a predetermined amount of data predetermined for measuring the processing time has been completed (step S423). ). If not completed, the processing from step S417 to step S421 is repeated. When the writing of the predetermined data amount is completed, the time measurement from step S415 is terminated, and the elapsed time is stored in association with the data amount of the unit data (step S425).

  For a plurality of unit data stored in advance, it is determined whether or not the measurement of the processing time has been completed (step S427), and if not completed, the process is executed again from step S401. In step S401, unit data that has not been measured for processing time is determined.

  If the processing time of all the unit data has been measured, the unit data with the shortest processing time is determined as the unit data used for the reading process as the next reading unit data (step S429). Next, the unit data having the shortest processing time is determined as the unit data used for the writing process as the unit data for writing (step S431). When the two unit data are determined, the process is returned. Step S429 constitutes unit data determining means in the reading device, and step S431 constitutes unit data determining means in the writing device.

In the main routine, copy processing is executed. In a copy process in which the read unit data and the write unit data are different, the predetermined accumulated data amount is determined by the data amount of the read unit data in the determination process (step S301) of the predetermined accumulated data amount of the copy processing routine shown in FIG. And is set to be a common multiple of the data amount of the write unit data. In the above-described copying process routine, steps S301 to S307 constitute reading execution means, and steps S309 to 313 constitute writing execution means.
By using such a common multiple, it is possible to efficiently perform the process of accumulating data in the memory 31 and the process of sweeping and writing data.

  In the above embodiment, when the master hard disk storage device and the target hard disk storage device are different types of products, the unit data of the shortest processing time is likely to be different, and by using different unit data for reading and writing, This is intended to shorten the copying time.

  Further, as shown in FIG. 1, when copying processing to a plurality of target hard disk storage devices, the CPUs 21 to 23 provided for the respective target hard disk storage devices TH1 to TH3 are shown in FIG. The copy processing routine is executed. In other words, the target hard disk storage device that has been copied first is used as a master hard disk storage device, data is read, data is copied to adjacent target hard disk storage devices, and data is sequentially written to adjacent hard disk storage devices. Execute the process.

  The embodiment described above is configured to perform copying between hard disk storage devices, but is not limited to a hard disk storage device, and instead of a hard disk storage device, a flash memory such as an SSD (solid state drive) or an SD memory card, or magnetic recording The present invention can also be used for copying data recorded in a recording device for recording on a medium, a recording device for recording on an optical medium, a recording device for recording on a magneto-optical medium, and other storage devices.

The present specification discloses the following configuration.
(1) A data transfer method for reading a predetermined amount of data stored in a first storage unit as predetermined unit data, and sequentially transferring the read unit data to the second storage unit.
A measurement step of measuring a transfer time of each unit data when a fixed amount of data is transferred with unit data of different data amount before ending the transfer of all the predetermined amount of data;
A unit data determination step for determining unit data of a data amount that has become the shortest transfer time among the transfer times of each unit data measured in the measurement step;
A data transfer method comprising: a data transfer step of transferring the remaining data using the unit data determined in the unit data determination step.
According to such a method, a plurality of unit data candidates with different data amounts are prepared, each transfer time when each unit data is transferred is measured, and the unit of the shortest transfer time among them is measured. Since the remaining data is transferred using data, the transfer time of all data to be transferred can be shortened as compared with the conventional transfer method in which one unit data is transferred.

(2) The data transfer method according to (1), wherein the measurement step and the unit data determination step are executed again during execution of the data transfer step.
According to such a method, the transfer time of all data to be transferred can be shortened more reliably. That is, depending on the characteristics of the storage device, the unit data transfer time may vary depending on the data transfer amount. Therefore, after the unit data is determined by the unit data determination step, during the data transfer step execution, the transfer time for each of the plurality of unit data is re-measured again periodically or randomly, and the unit data that becomes the shortest transfer time Update. Thereby, the transfer time of all data is further shortened.

(3) A data transfer method for transferring a predetermined amount of data stored in the first storage means to the second storage means,
A unit data determination step for determining a plurality of unit data having different data amounts, with the data amount transferred in one transfer process as unit data;
A transfer time measuring step of transferring a fixed amount of data with the data amount of each unit data determined in the unit data determining step, and measuring the time required for the transfer for each unit data;
The shortest unit data determination step for determining the unit data of the shortest transfer time among the transfer times of each unit data measured in the transfer time measurement step;
A data transfer method comprising: a transfer step of transferring a predetermined amount of data stored in the first storage means to the second storage means by repeatedly transferring the unit data determined in the shortest unit data determination step .
According to such a method, in a transfer method in which a predetermined amount of data is transferred by repeating the transfer of unit data with unit data transfer as one unit, transfer times of unit data of a plurality of different data amounts are measured. Thus, the comparison is a method of determining unit data having a data amount capable of realizing a short transfer time in a shorter time.

(4) The data transfer method according to (3), wherein the unit data determination step, the transfer time measurement step, and the shortest unit data determination step are executed again during execution of the transfer step.
According to such a method, the transfer time of all data to be transferred can be shortened more reliably. That is, depending on the characteristics of the storage device, the unit data transfer time varies depending on the data transfer amount. Therefore, after the unit data is determined by the shortest unit data determination step, the transfer time for each of the plurality of unit data is remeasured again periodically or randomly during the transfer step execution, so that the unit data that becomes the shortest transfer time is obtained. Update. Thereby, the transfer time of all data is further shortened.

DESCRIPTION OF SYMBOLS 1 Copy apparatus 20-23 Central processing unit 31-33 Memory 4M, 4T1, 4T2, 4T3 Connection terminal MH Master start hard disk storage device TH1-3 Target hard disk storage device

Claims (4)

A connection terminal connected to the storage device;
A data reading device having reading means for reading data for each predetermined unit data from a storage device connected to the connection terminal,
Unit data storage means for storing a plurality of unit data having different data amounts;
Using each unit data stored in the unit data storage means, a processing time measuring means for measuring a processing time when reading a certain amount of data for each unit data,
Processing time storage means for storing the processing time measured by the processing time measuring means for each unit data;
Unit data determining means for determining unit data having the shortest processing time among the processing times stored in the processing time storage means;
A reading apparatus comprising: a reading execution unit that executes a reading process from the storage device using the unit data determined by the unit data determining unit. A connection terminal connected to the storage device;
A data writing device having writing means for writing data for each predetermined unit data in a storage device connected to the connection terminal,
Unit data storage means for storing a plurality of unit data having different data amounts;
Using each unit data stored in the unit data storage means, a processing time measuring means for measuring the processing time when writing a certain amount of data for each unit data,
Processing time storage means for storing the processing time measured by the processing time measuring means for each unit data;
Unit data determining means for determining unit data having the shortest processing time among the processing times stored in the processing time storage means;
A writing device comprising: a writing execution unit that executes a subsequent writing process to the storage device using the unit data determined by the unit data determining unit. A first connection terminal connected to the copy source storage device; a second connection terminal connected to the copy destination storage device;
Reading means for reading data for each predetermined unit data from the copy source storage device;
Address storage means for storing the address in the physical format of the reading start position of the data read from the copy source storage device;
A writing unit for writing the data read by the reading unit to the copy destination storage device from the same address position as the address stored in the address storage unit is provided, and the copying process is performed by writing the data read by the reading unit by the writing unit. A copying machine to perform,
Unit data storage means for storing a plurality of types of unit data for reading data from the copy source storage device and writing data to the copy destination storage device in one command as unit data having different data amounts;
Pre-processing means for executing a copying process of a predetermined amount of data using a plurality of unit data stored in the unit data storage means during the copying process;
Processing time measuring means for measuring the processing time of each unit data processed by the preliminary processing means for each unit data;
Processing time storage means for storing the processing time measured by the processing time measuring means for each unit data;
Unit data determination means for comparing processing times stored in the processing time storage means and determining unit data having the shortest processing time as unit data used for copying processing;
A copying apparatus comprising: a copying unit that executes a copying process using the unit data determined by the unit data determining unit. The copying apparatus according to claim 3, wherein the copying apparatus includes a plurality of the second connection terminals, and the writing unit writes the read data to the plurality of copy destination storage devices.

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