JP3363097B2 - Disk drive device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device connected to a computer by a serial interface.

[0002]

2. Description of the Related Art Recently, as a storage medium of a computer,
Media such as CD-R and CD-RW are increasingly used. In addition, a disk drive device that drives a CD-R, a CD-RW, or the like uses a SCSI (Sm
all Computer System Inter
A face interface is commonly used to connect to a computer.

FIG. 3 shows a conventional disk drive device 10.
And the computer 14 to which it is connected. A CD-R drive device will be described as an example of the disc drive device 10. CD-R
The drive device 10 is connected to the computer 14 by a SCSI cable 12. An input / output unit 11 which is a controller of a SCSI interface is provided in the computer 14. Further, as a specific example of the connected computer 14, a personal computer (hereinafter, simply referred to as P
C) or workstation (hereinafter simply W)
S).

In the conventional connection between the CD-R drive device 10 and the computer 14, the input / output channel 15 in the computer 14 specifies the data transfer rate between the input / output channel 15 and the input / output unit 11. Was. Therefore, the CD-R drive device 10 transfers the read data from the disk 19 (not shown) to the computer 14 at the designated data transfer rate, and also transfers the read data from the computer 14 at the designated data transfer rate. The received data was received and written to the disk 19. In addition, the SCSI in the CD-R drive device 10
From the viewpoint of cost reduction, the input / output unit 11 of the interface controls the input / output unit 11a.
Controls both reading and writing with one chip. In such a case, there is a limit to the control performed by one chip, and if the above-mentioned data transfer rate is attempted to be increased, the transfer rate from the disk, which is usually called a multiple speed, may be sacrificed. .

In the CD-R drive device 10, the transfer speed from the disc, which is generally called as a multiple speed, is sung as a specification of the actual transfer speed, and this number is the judgment of the user's purchase of the CD-R drive device. It is the standard. Therefore, if the transfer rate from the disk is sacrificed according to the numerical value of the transfer rate of the data specified by the computer 14, the CD-R drive device 10 side specifies the transfer rate from the computer 14 side. It has been attempted to specify a data transfer rate slower than the data transfer rate, thereby increasing the so-called multiple speed transfer rate from the disk at the expense of the data transfer rate.

[0006]

As described above, due to the desire to transfer data at a speed lower than the transfer speed of data specified by the computer side, data transfer from the CD-R drive device side to the computer side is performed. When the transfer rate was specified, no problem occurred when the connection destination computer was the PC, but when the connection destination computer was the WS, the WS input / output channel 15
Has a problem that the WS hangs up because it cannot receive the designation of the data transfer rate from the external device.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to determine whether the computer is a PC or a WS when the data transfer rate is specified from the disk drive device side. According to the present invention, there is provided a disk drive device capable of switching whether or not the data transfer rate is specified from the disk drive device side.

[0008]

The present invention has the following constitution in order to solve the above problems. That is, the present invention is a disk drive device connected to a computer and capable of designating a data transfer rate with the computer to an input / output channel of the computer, and a changeover switch for switching whether or not the transfer rate is designated. When the transfer switch specifies that the transfer rate is specified, an input / output unit for specifying the transfer speed is provided to the input / output channel of the computer, and the switch is
To change the length of one block when transferring data
It is characterized by being a switch for changing the block length
It By adopting this configuration, when the destination computer is a workstation, it is possible to prevent the data transfer rate from being specified from the disk drive device side. Can be prevented. Also, the switching
The switch changes the length of one block when transferring data.
Since it is a switch for changing the block length to change,
There is no need to provide a new changeover switch,
Block of workstation and PC that had been replaced
At the same time as switching the length, whether or not the transfer rate is set can be changed.
Get

When connected to one computer,
If the input / output channel of the computer does not accept the designation of the transfer rate from the outside, the memory for storing the type of the input / output channel and the memory in the memory when connected to another computer The type of the input / output channel that does not accept the designation from the outside that is stored is read and compared with the input / output channel of the other computer,
If the input / output channel of the other computer is the same as the input / output channel read from the memory, a control unit for instructing the input / output unit not to specify the transfer rate is provided. Good. If you do this,
If the computer you are connecting to is a personal computer that has an I / O channel that does not accept the specification of the data transfer rate from the outside, and if you have experience of hang-up, the same applies thereafter. When connecting to a PC with a model I / O channel, prevent the recurrence of PC hang by prohibiting the specification of the data transfer rate to the PC even if the changeover switch is specified. can.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. First, FIG. 1 and FIG. 2 show block diagrams for explaining the hardware configuration of the present invention. In the present embodiment, the CD-R drive device is a disc drive device as in the case of the conventional technique. The CD-R drive device 30 includes a CPU 32 that is a control unit inside. In addition, the CPU 32
Is connected to an EEPROM (electrically rewritable memory) 34, and the CPU 32 outputs an operation command to peripheral parts based on the operation data stored in the EEPROM 34. The CD-R drive device 30 is connected to the computer (PC or WS) 14 from the input / output unit 36 by the SCSI cable 33. An input / output control unit 36a that controls the input / output unit is provided inside the input / output unit 36. From the input / output control unit 36a, the transfer rate of data to the input / output channel 16 in the computer 14 is designated. Is done. The interface system between the CD-R drive device 30 and the computer 14 is not limited to the SCSI interface. 38 is a player section. In the player section 38, data reading and data writing are performed from the mounted CD-R disc 19.

Further, depending on whether the computer 14 to which the CD-R drive 10 is connected is WS or PC,
A block length changing switch 40 for switching the block length of one block of transfer data is connected to the CPU 32. That is, when the block length of one block of transfer data at the time of data transfer is WS, 512 Byte
e, which is 2048 bytes for a PC.
Therefore, is the connection destination computer 14 a WS?
Depending on whether it is C, the switch 40 for changing the block length
Is operated to select the block length from the CD-R drive device 10 side. Further, the block length changing switch 40 includes the CD-R drive device 30, the input / output unit 36 of the computer 14, and the input / output channel 16.
It also serves as a changeover switch for selecting whether or not the data transfer rate between the two is specified from the CD-R drive device 10 side, that is, whether or not the data transfer rate is specified. In this manner, the changeover switch for changing over the designation of the data transfer rate also serves as the block length changing switch 40 which has been provided in the related art.
Costs can be reduced without the need for a separate switch.

The data in the EEPROM 34, which is a memory in which data for operating the CPU 32 is stored, is rewritten by the user by operating the rewriting switch 42 provided in the CD-R drive device 30. Is provided so that it can be done. The rewriting of the data in the EEPROM 34 is performed when a connection is made to a certain PC but the specification of the data transfer rate is not accepted and the program hangs up. That is, normally, the input / output channel 16 of the PC can accept the designation of the data transfer rate from the outside, but the input / output channel 16 that cannot exceptionally accept the designation of the data transfer rate from the outside also. Exists. When a PC having such an input / output channel 16 is connected, the model of the input / output channel 16 is stored.

As described above, since the model of the input / output channel 16 that does not accept the specification of the data transfer rate from the outside is stored in the EEPROM 34, when connecting to another PC in the future, the model from the outside is stored. Since it is possible to determine whether the model is an I / O channel that does not accept the data transfer rate specification, it is possible to prohibit specification of the data transfer rate when the same I / O channel is encountered. Recurrence can be prevented. Moreover, the EEPRO can be easily operated only by operating the rewriting switch 42.
Since the data in M34 can be rewritten, the user can save the trouble of returning the CD-R drive device 30 to the manufacturer and storing the model of the input / output channel that does not accept the specification of the data transfer rate from the outside. Can easily be done by the side.

The block length changing switch 40
Alternatively, as the rewriting switch 42, it is possible to use a jumper switch, a dip switch, or the like provided on the printed circuit board in the CD-R drive device 30. Normally, a jumper switch, a DIP switch, etc. are used for setting the ID of the SCSI interface and the presence / absence of parity. It is set to use a part of the manufacturer for in-house evaluation.

Next, the operation of designating the data transfer rate of the CD-R drive device will be described with reference to FIG. First, the block length changing switch 40 is operated before START100.
After that, it is assumed that there is no human operation. Step 10
2, the CPU 32 uses the block length changing switch 40.
It is determined whether or not the data transfer rate is designated by detecting ON-OFF of. Here, when the connection destination is a PC, the switch 40 for changing the block length is manually turned off before START 100.
The process moves to the next step 104. On the other hand, when the connection destination is WS, the switch for changing the block length is manually turned on before START100, so C
The PU 32 proceeds to step 110 of sending a prohibition instruction for designating the data transfer rate to the input / output control unit 36a of the input / output unit 36. After this, the process proceeds to step 108, and the operation of designating the data transfer rate ends.

The block length changing switch 40 is turned off.
In step 104, the CPU 32 determines from the data stored in the EEPROM 34 whether the currently connected input / output channel 16 can specify the data transfer rate. At this time, EEP
If it is found from the data stored in the ROM 34 that the currently connected I / O channel 16 is a model in which the data transfer rate cannot be specified, the data transfer rate is not specified, and step 110 is executed. Transition. In step 110, the CPU 32 sends a prohibition command for specifying the data transfer rate to the input / output control unit 36 a of the input / output unit 36,
Then, the process proceeds to step 108, and the operation of designating the data transfer rate ends. On the other hand, the input / output channel 16 currently connected and the input / output channel 16 in which the transfer rate of the data stored in the EEPROM 34 cannot be specified
If the models do not match with, the CPU 32 determines that it is possible to specify the data transfer rate, and step 106
Move to.

At step 106, the CPU 32 sets the data transfer rate and instructs the input / output control section 36a of the input / output section 36 to specify this rate on the computer side. Input / output unit 36 that receives a command from the CPU 32
In step 107, the input / output control unit 36a specifies the data transfer rate to the input / output channel 16 of the PC. Next, the process proceeds to step 108 and the designation of the data transfer rate is completed. In this embodiment, the data transfer rate is 10 MB / s for writing and 5 MB / s for reading.
s is set. In this way, by lowering the reading speed from the writing speed, the processing capacity of the input / output control unit 36a, which is the control unit of the input / output unit, can be afforded. And as a result, the transfer rate from the disk is 8
It is possible to achieve speedup from double speed to 12 times speed. The data transfer rate is 1 as above.
It is not limited to only the combination of types, but for example, under certain conditions, 5 MB /
You may set the case where it becomes s.

Although the present invention has been variously described with reference to the preferred embodiments, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. Of course.

[0019]

The disk drive device according to the present invention is a disk drive device that is connected to a computer and can specify the data transfer rate between the computer and the input / output channel of the computer. Is provided , and an input / output unit for specifying the transfer rate to the input / output channel of the computer is provided when the transfer switch detects that the transfer rate has been specified.
Block length to change the length of one block when sending
Since it is a switch for changing the computer , if the connected computer is a workstation, it is possible to prevent the data transfer speed from being specified from the disk drive device side, so hang up the workstation etc. Can be prevented. In addition, the changeover switch
Changed the length of one block when transferring data.
Since it is a switch for changing the block length for
No need to install a replacement switch, reducing the number of parts
This can reduce costs. When the input / output channel of the computer does not accept the designation of the transfer rate from the outside when connected to one computer, a memory for storing the type of the input / output channel and another When connected to a computer, the type of the input / output channel stored in the memory that does not accept the designation from the outside is read and compared with the input / output channel of the other computer, and the input / output of the other computer is read. If the channel is the same as the I / O channel read from the memory, a control unit for instructing the I / O unit not to specify the transfer rate is provided, and the computer at the connection destination is a personal computer. It is connected to the one that has the input / output channel that does not accept the specification of the data transfer rate from the outside exceptionally, and has the experience of hang-up. Then, after that, when connecting to a PC with the same model of I / O channel, the specification of the data transfer speed to the PC is prohibited and the PC hangs even if the changeover switch is specified. The recurrence of can be prevented .

[Brief description of drawings]

FIG. 1 is a block diagram showing a connection between a disk drive device according to the present invention and a computer.

FIG. 2 is a flowchart illustrating a data transfer rate specifying operation.

FIG. 3 is a block diagram showing a connection between a conventional disk drive device and a computer.

[Explanation of symbols]

14 Computer 16 I / O channels 19 discs 30 disk drive device 32 CPU (control unit) 33 SCSI cable 34 EEPROM (memory) 36 I / O section 36a Input / output control unit 38 Player Division 40 block length change switch 42 Rewrite switch

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Claims (2)

(57) [Claims] 1. A disk drive device connected to a computer and capable of designating a transfer rate of data to and from the computer to an input / output channel of the computer, the changeover switch switching whether or not the transfer rate is designated. When it is detected that the transfer rate is designated by the changeover switch , an input / output unit for designating the transfer rate is provided to the input / output channel of the computer, and the changeover switch is used for one block at the time of data transfer.
Switch for changing the block length to change the block length
A disk drive device characterized in that 2. A memory for storing the type of the input / output channel when the input / output channel of the computer does not accept the designation of the transfer rate from the outside when connected to one computer. , When the computer is connected to another computer, the type of the input / output channel stored in the memory that does not accept the designation from the outside is read out, compared with the input / output channel of the other computer, and the other computer is compared. A control unit for instructing the input / output unit not to specify the transfer rate if the input / output channel of the computer is the same as the input / output channel read from the memory. Item 1. The disk drive device according to item 1.