JPH01320522A - Information recording and reproducing system - Google Patents

Abstract

PURPOSE:To enable a recording and a reproducing processings to be performed even when the sector size of a directory is different from that of data by executing the recording instruction and the reproducing instruction of the directory by a host computer via an SCSI. CONSTITUTION:A mode bit 11 is a bit to show whether an operation is a recording operation or a reproducing operation, and is constituted of two or more bits, and includes the function of a command to reproduce the next directory in case of performing the reproducing operation. When a directory command 10 is issued from a CPU, the mode bit of a byte 1 in the command 10 is confirmed, and the recording of the directory is performed when a mode bit 11 is set at 0. And the CPU judges the bit 0 of the mode bit when the bit 1 of the mode bit is set at 1. When a bit 0 is set at 0, a first directory is reproduced, and when the bit 0 is set at 1, the next directory is reproduced. In such a way, it is possible to perform recording and reproduction even when the sector size of the directory is different from that of the data, and to easily manage an optical card with several M bytes.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information recording and reproducing method for recording and reproducing predetermined information on an optical card based on instructions from a host computer via an SC3I.

[Prior art] SCS I (Small Compute
r System Interface) is an interface manufactured by Shugart Corporation in the United States that connects small computers and their peripheral devices.
puter SS75te Interface) A
NSI (American National Standards Institute) Standardized and renamed in X3.131-1986, handles 8-bit parallel signals, has a data transmission rate of 1.5 Mbytes/sec, and can perform multitasking by controlling up to 7 devices simultaneously. It is.

The scope of the interface rules stipulated by ANS I is the following five points.

(1) Types and definitions of interface signals, and timing of signal exchange (4) Command system, command format, and function of each command for controlling various peripheral devices and data transfer; (5) Status byte format for notifying the host computer of command execution results; This is the structure of sense data that informs of abnormal conditions etc. in the process.

The command system in (4) above is as follows.

SC3I commands are divided into eight types of groups. The first byte of CDH is an operation code, the upper 3 bits of this operation code specify a group code, and the lower 5 bits specify a command code (a code indicating the type of command) for each group.

The length of the CDH is defined for each group as follows.

(1) Group 0...6 bytes (2) Groove...10 bytes (3) Group 2
~4... Reserved (4) Group 5...
...12 bytes (5) Groups 6 to 7... Pengu Unique The above CDBs of groups 6 to 7 are a group of commands that can be uniquely defined in the 5C5I device.

In each command, the logical block address is such that fixed-length data blocks are consecutively arranged on the logical unit.

FIG. 10 is a diagram showing an example of the configuration of logical blocks in a hard disk device.

In FIG. 10, a data block with cylinder=O and sector=O is set to a logical block address=O, and sectors,
Each time the number of tracks and cylinders increases by one, the logical block address is increased by one.

The advantage of logical block addressing is that the initiator (host computer) accesses data by specifying the logical block and address of the first data block and the number of blocks to be processed, so there is no need to be aware of the physical structure. It is. Therefore, when using the above logical block addressing, when devices with different numbers of cylinders, tracks, sectors, etc. are connected,
It can be operated with the same software.

Note that in SCSI, the logical unit number (hereinafter referred to as
rLUNJ) may be assigned to a physical device or a virtual device.

FIG. 11 is a diagram showing a general example of the system configuration of 5C3I.

As shown in FIG. 10, a physical device such as a hard disk is usually used as the logical unit.

[Problem to be solved by the invention] Directory information is usually several tens of bits.

On the other hand, the data capacity of l track is 512 bytes,
In the case of 1024 bytes, in an information recording/reproducing carrier that records on a track-by-track basis, the portion other than the number of bytes of the directory is wasted.

In order to eliminate this waste, a method may be considered in which a plurality of pieces of management information such as a directory are recorded in one track.

By the way, in the SC3I system, when recording and reproducing using logical block addresses, logical blows,
They are supposed to be treated as having the same capacity. However, as described above, there are a plurality of directory sections in one track (that is, there are a plurality of sectors in each track), whereas the data section has only one sector in one traffic. Therefore, the direct sector size and the data sector size are different, and there is a problem that such a difference in sector size cannot be handled by the SC3I system.

The present invention enables recording and recording in an SCSI system even if the directory sector size and data sector size are different.
The object of the present invention is to provide an information recording and reproducing method that can perform reproducing processing.

[Means for Solving the Problems] In the present invention, a host computer issues a directory recording command and a reproduction command via an SC5I.

[Operation] In the present invention, since the host computer issues directory recording commands and playback commands via the 5C3I, even if the direct sector size and the data sector size are different, recording and playback processing can be performed in the SCSI system. can do.

[Example] First, the basic configuration of an optical card and the configuration of an optical head section will be explained. Note that the same members are given the same numbers.

FIG. 5 is a plan view showing an example of an optical card used in the present invention.

FIG. 6 is an enlarged view of the portion indicated by A in FIG. 5.

The optical card 1 has a linear tracking track 5 (5
-0, 5-1, 5-2, ...) are arranged at equal intervals. A data recording section 4 (4-0, 4-1) records information between adjacent tracking tracks.
, 4-2, . . . ) are provided. That is, the optical card 1 has the data recording section 4 between one tracking track and the adjacent tracking track.

As shown in FIG. 6, tracking tracks 5-1 and 5
A G mark 7 is provided between 22 and 22. This G mark 7 is a mark for identifying a reference track, and is placed at a predetermined location on the optical card 1 by preformatting. On the extension line of the data recording section 4 where the G mark 7 exists.

The medium type pattern 8, which is the auxiliary data portion, is preformatted or recorded with a light spot. This medium type pattern 8 represents the identification of the optical card 1, and records information such as the modulation/demodulation method, the data capacity per track, and the total number of tracks.

FIG. 7 is an explanatory diagram of the configuration of the optical head section of the information recording/reproducing device δ.

FIG. 8 is an explanatory diagram showing a light beam irradiated onto the optical card 1. FIG.

FIG. 9 is an explanatory diagram showing the configuration of a photodetector.

A light beam generated by a light source 27 such as a semiconductor laser is collimated by a collimator lens 28 and divided into three beams by a diffraction grating 30. These light beams are directed by an objective lens z6 to the tracking tracks 5-1, 5-2, 5-2, and 5-2 of the optical card 1, for example, as shown in FIG.
The beam spot S1. S
2. Form S3. Here, the optical card 1 is moved in the direction of arrow R shown in FIG. 7 by a driving means (not shown),
The optical card 1 is scanned in the tracking track force (extending direction) by the beam spots 81 to S3.

The reflected light from the beam boats S1, S2, and S3 passes through the objective lens 26 again, is reflected by the beam splitter 20, and is sent to the photodetector 22.2 by the condensing lens system 21.
3.24 respectively. The condensing lens system 21 is
These photodetectors 22 to 2 have an astigmatism system and perform autofocus using a known astigmatism method.
4 is configured with the arrangement shown in FIG. 9, and the photodetector 23 is
It is divided into four parts like A, B, C, and D.

Note that the prism 29 shown in the seventh UA is a prism that converts the cross-sectional distribution of the collimated light beam emitted from the semiconductor laser from an ellipse to a circle.

Next, the operation of recording information on the optical card 1 will be explained.

For example, when recording information on the data recording section 4-1, first beams SL, S2, and S3 are irradiated onto the tracking track 5-1, the data recording section 4-1, and the tracking track 5-2, respectively. These beam spots scan in the direction of arrow F shown in FIG. 8 as the optical card 1 moves. The reflected light from the beam spot S3 enters the photodetector 22, and the reflected light from the beam spot S3 enters the photodetector 24, and a tracking signal is detected by a so-called three-beam method.

That is, when the beam spots S1 and S3 shift with respect to the tracking track 5-1.5-2, the photodetector 22
The intensity of light incident on and 24 changes, and a tracking signal is obtained by comparing the signals from these light receiving surfaces (tracking track S-t, 5-2).

Based on this tracking signal, a tracking means (not shown) (for example, in FIG. 9, the objective lens 26
beam split S1. S2 and S3 are moved together in the direction perpendicular to the scanning direction (direction D shown in Fig. 5), and automatic tracking (AT) is performed.
) is carried out.

Then, along the tracking track 5-1, 5-2, the data recording section 4-1 is
The recording bit 31 is accurately recorded.

FIG. 3 is a block diagram showing an embodiment of the information recording/reproducing apparatus according to the present invention.

An information recording/reproducing device M (hereinafter referred to as a drive) 31 is connected to a host computer 32 which is a higher-level control device.
The MPU 33 performs data communication, control, etc. between the drive 31 and the host computer 32.
M is built in and controls the card feed motor 37 and head feed motor 36. The AT/AF control circuit 34 receives the signal from the photodetector 39 and controls the AF actuator 40.
, which drive the AT actuator 41. The modulation circuit 35 performs recording by changing the emission intensity of the light source 38 during recording, and demodulates data based on the signal from the photodetector 39 during reproduction.

The host computer 32 transmits and receives data to and from the drive 31, records information for each data track on the optical card 1, and causes the optical card 1 to perform a reproduction operation.

The optical card 1 has a high error rate due to the nature of the medium, and if highly reliable information is required, it is necessary to provide error correction means.

FIG. 4 shows the host computer 3 in the above embodiment.
FIG. 2 is a block diagram showing 2 more specifically.

The host computer 32 includes an MPU 13, a RAM 14,
It is composed of ROM15, SC3I controller 5PC12.

The MPU 13 controls the operation of the drive 31 and transfers data to and from the drive 31.
5PC12 and interprets commands sent by the initiator (host computer 32) via the SC3I bus,
It is something to be carried out.

Next, commands related to directories in the above embodiment will be explained.

FIG. 1 is a diagram showing an example of a directory command in the above embodiment.

FIG. 2 is a flowchart showing the operation of interpreting a directory command in the above embodiment.

A mode bit 11 shown in FIG. 1 is a bit indicating whether the operation is a recording operation or a reproduction operation. In the case of the above embodiment, the mode bit 11 is composed of two or more bits, and in the case of a playback operation, it also includes the function of a command to playback the next directory.

In Figure 2, directory command 1 shown in Figure 1
0 is issued from the host computer 32 (SL
), check the mode bit of byte 1 in directory command 10 S2), mode bit 11 is rQ
If it is J, the directory is recorded (S3). Then, the next operation is performed (S7).

If bit 1 of the mode bit is “1”, the host computer 32 determines bit O of the mode pit (S
4), and if the above bit 0 is "O", play the first directory SS), bit O is "1" 1
If there is, the next directory is played back (SS).

As mentioned above, by providing a new directory command, even if the directory sector size and data sector size are different, the 5C3I system can perform recording and playback processing. It is possible to record small amounts of information, make efficient use of optical cards, and easily manage optical cards of several megabytes.

Next, when directory information is to be reproduced multiple times from an optical card, a method that can shorten the directory information reproduction time from the second time onwards will be described.

FIG. 12 is a diagram showing a handshake procedure between the host computer and the RS controller in the embodiment described above.

FIG. 13 is a schematic diagram of the RAM in which directory information is stored in the above embodiment.

When directory information is reproduced from the optical card 1 and transferred to the host computer 32, the host computer 32 first sends a directory request command (RQD) to the controller (drive 31) via the R5232C communication line.

If the controller successfully receives the RQD command (
In other words, if there is no error such as a parity error or overrun), an ACK is sent to the host computer 32.
(06h) is sent.

Next, if the controller has already read the directory information from the optical card, it sends 5TX (02h) and the number of blocks in the directory. Here, a double directory is defined as one block. If the directory has never been read from the optical card, the directory information is imported into the RAM in the controller.
As shown in FIG. 13, data is stored.

After importing, STX (02h) and the number of blocks in the directory are also transferred. Here, the number of blocks is 2 bytes, which are transmitted in the order of high byte and low byte.

The host computer 32 that receives STX (02h), byte, and 'CI-t<a) knows the number of directories to be received from the information in the high byte and low byte.

For example, 1 directory = 30 bytes 1 block = 2
If the number of 0 directory blocks is n, then 600n bytes of information will be received.

Next, the host computer 32 transmits an ACK to the controller 31 to facilitate data transmission from the controller 31.

The controller that received the ACK transmits data for STX+1 blocks. STX here is a delimiter indicating the start of a block.

Repeat the above operation for the number of blocks.

Here, a portion less than 600 bytes (the number of data in one block) is filled with a NULL code (OOh) and transferred.

As mentioned above, since the directory of the optical card 1 is arranged on the RAM of the controller, it only takes time for the first reading, and it can be read at high speed from the second time onward. Furthermore, by transferring the number of blocks when transferring directory data, it is possible to easily know the size of the buffer that should be prepared on the host side.

[Effects of the Invention] According to the present invention, in a method for recording and reproducing predetermined information on an optical card based on a command from a host computer via a 5C3I, even if the sector size of the directory and the sector size of data are different, , it has the advantage that recording and playback processing can be performed using the SC3I system.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a directory command in an embodiment of the present invention. FIG. 2 is a flowchart showing the operation of interpreting a directory command in the above embodiment. FIG. 3 is a block diagram showing an embodiment of the information recording/reproducing apparatus according to the present invention. FIG. 4 shows the host computer 3 in the above embodiment.
FIG. 2 is a block diagram showing 2 more specifically. FIG. 5 is a schematic plan view showing an example of an optical card. 6 is a partially enlarged view of section A in FIG. 5. FIG. FIG. 7 is an explanatory diagram of the configuration of the optical head section of the information recording/reproducing apparatus. FIG. 8 is an explanatory diagram showing a light beam irradiated onto an optical card. FIG. 9 is an explanatory diagram of the operation of the information recording/reproducing apparatus for recording onto an optical card. FIG. 10 is a diagram showing an example of the configuration of logical blocks in a hard disk device. FIG. 11 is a block diagram of an intra-membrane SCSI system. FIG. 12 is a diagram showing a handshake procedure between the host computer and the RS controller in the above embodiment. FIG. 13 is a schematic diagram of the RAM in which directory information is stored in the above embodiment. 1... Optical card, 10... Area for managing the number of logical units, 11.12
...recording area of optical card, 31...drive, 32...host computer. 200... Flag information indicating that this is an area for managing the number of logical units, 201... Information indicating the number of logical units, 202...
Information indicating the start position and end position of the area realizing the logical unit, 4.4-1.4-2...Data recording section, 5.5-0~
5-2...Tracking track. Patent applicant Canon Co., Ltd. Agent Arata Yokubo - U Figure 2 Figure 3 Figure 4 Figure 7 Figure 8 Figure 9 Figure 11 Figure 12

Claims (4)

[Claims] (1) A method for recording and reproducing predetermined information on an optical card based on instructions from a host computer via SCSI, characterized in that the host computer issues directory recording commands and playback commands via SCSI. Information recording and playback method. (2) In claim (1), when reproducing a plurality of pieces of directory information recorded in the directory recording section of the optical card, reading out all directory information and storing the read directory information in a RAM; An information recording and reproducing method characterized in that a plurality of pieces of directory information are made into one block, and data is transferred to a control device following the number of transfer blocks. (3) The information recording and reproducing method according to claim (2), wherein the directory recording section is not assigned a physical track number and a plurality of directories are recorded in one track. (4) The information recording and reproducing method according to claim (2), wherein the block number has a number of bytes representing (maximum number of directories)/(number of directories in one block).