JPH05135483A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide an information recording and reproducing device shortening remarcably the data reproducing time of the information recording and reproducing device. CONSTITUTION:This device is provided with a medium 1 recording and reproducing data, a reproducing head 2 reading the data from the medium, a data buffer 7 storing temporalily at the time of reproducing the data and a continuous data detecting means detecting that the data is continuous when a data requirement is generated next. Then, this device is constituted so that when the data is divided and read, the look-ahead of subsequent data is performed, at the time of judging as the continuous data by the continuous data detecting means when the data requirement is received while performing the look-ahead, the lookahead is not interrupted but continued. Thus, the reproducing time of the information recording and reproducing device is shortened remarcably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus for recording / reproducing data.

[0002]

2. Description of the Related Art Conventionally, a data prefetch function reads data from a medium when a data request is issued from a host computer, stores the data in a primary data buffer, and transfers the requested data.
It continued to read the following data into the data buffer, interrupted the data reading when the next data request occurred, and responded to the request. FIG. 3 is a timing chart when the conventional read-ahead function is performed in an example of the medium having 17 blocks on one track. In the figure, a command A (block length 8) is issued from the host computer, and the sector waiting section requires 5 blocks until the target sector is reached, and then reading into the data buffer is started. After reading 8 blocks, data transfer to the host computer is started. Prefetching is continued during that time, and a command wait state is entered after the data transfer is completed. However, if the next command B (block length 8) is issued from the host computer immediately after the data transfer is completed, the next command is issued. Then, the prefetch operation is interrupted and the execution of command B is started. Since the 5th block has been read into the data buffer by the prefetch operation after the command A, the read operation from the 14th block is started and the target sector waits. When the 14th block, which is the target sector, arrives, reading of the following sectors is started. When the reading of 3 blocks is completed, the data transfer to the host computer is started, and when the data transfer is completed, the command B ends.

[0003]

The data read-ahead function has been used to improve the reproduction speed, but when it is combined with a high-performance host computer with a short command issuing interval due to the recent increase in the speed of the host computer. In the conventional read-ahead function, even if some of the data required next is read-ahead as shown in FIG. 2, it does not lead to improvement in speed.

In view of the above problems, the present invention provides an information recording / reproducing apparatus capable of greatly shortening the data reproducing time of the information recording / reproducing apparatus.

[0005]

In order to solve the above-mentioned problems, an information recording / reproducing apparatus of the present invention comprises a medium capable of recording / reproducing data, a reproducing head for reading data from the medium, and a primary recording medium for reproducing the data. Data buffer that stores the data continuously, and continuous data detection means that detects that the data is continuous when the next data request is generated. The pre-reading is carried out, and when the continuous data detecting means judges that the data is continuous data when a data request comes during the pre-reading, the pre-reading is continued without interruption.

[0006]

According to the present invention, with the above construction, the reproduction time of the information recording / reproducing apparatus can be greatly shortened.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An information recording / reproducing apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a general information recording / reproducing apparatus. In FIG. 1, 1 is a disk-shaped recording medium which is a medium capable of recording and reproducing the data, 2 is a recording / reproducing head which is the reproducing means for recording or reproducing, 3 is a disk motor which rotates the disk-shaped recording medium, 4 Is a recording / reproducing head control unit for controlling the position of the recording / reproducing head, 5 is a signal processing unit for demodulating a signal reproduced by the recording / reproducing head and modulating for recording by the recording / reproducing head, and 6 is the disk A motor, the recording / reproducing head control unit, and a device control unit that issues a command to the signal processing unit,
Reference numeral 7 is a data buffer for temporarily storing data to be recorded or reproduced, and 8 is an interface section for communicating with the host computer.

FIG. 2 shows a timing chart of the prefetch operation in one embodiment of the present invention. With respect to the information recording / reproducing apparatus configured as described above, the prefetch operation in one embodiment of the present invention will be described below with reference to FIGS. 1 and 2. First, the device control unit 6 receives, for example, a read command (command A) with a required block number 8 from the host computer through the interface unit 8. When the command is received, the recording / reproducing head 2 which is a reproducing unit is operated through the recording / reproducing head control unit 4. After moving to the track (seek), wait until the target sector reaches the position of the recording / reproducing head (sector waiting section). When the target sector arrives, the recording / reproducing head 2 reads the data from the medium and stores it in the data buffer 7 through the signal processing unit 5 and the device control unit 6. When 8 blocks have been stored in the data buffer 7, the data is transferred to the host computer through the interface section 8, and the data on and after the 8th block is continuously stored in the data buffer 7 while transferring the data. Immediately after the end of the data transfer to the host computer, when the device control unit 6 receives the next read command (8 block data command B following the previous read command) through the interface unit 8, whether the continuous data is requested by the continuous data detecting means. Inspect. When it is determined that the data is continuous data, the pre-reading operation is continued and the data buffer 7 waits until data of 9-16 blocks is stored. When 8 blocks of data are stored, the data is transferred to the host computer through the interface unit 8.

With the above configuration, even if a divided request is made when reproducing continuous data, the reproducing operation is continuously performed without interruption, so that the entire data reproducing time can be greatly shortened. is there.

Although the embodiments have been described using the optical disk device, the present invention is not limited to this, and an optical card,
Applications to devices using other recording media such as magnetic disks are within the scope of the present invention.

[0012]

As described above, according to the present invention, even if a divided request is made at the time of reproducing continuous data, the reproducing operation is continuously performed without interruption, so that the entire data reproducing time is significantly increased. It can be shortened.

[Brief description of drawings]

FIG. 1 is a schematic block configuration diagram of a general information recording / reproducing apparatus.

FIG. 2 is a timing chart showing the prefetch operation of the present invention.

FIG. 3 is a timing chart showing a conventional read-ahead operation.

[Explanation of symbols]

 1 disk-shaped recording medium 2 recording / reproducing head 3 disk motor 4 recording / reproducing head control unit 5 signal processing unit 6 device control unit 7 data buffer 8 interface unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location G11B 20/10 D 7923-5D (72) Inventor Shoji Hasegawa 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Sangyo Co., Ltd.

Claims (1)

[Claims] 1. A medium capable of recording / reproducing data, a reproducing means for reading data from the medium, a data buffer for temporarily storing data at the time of recording / reproducing data, and the data when a data reproducing request is issued. Is provided with a continuous data detecting means for detecting that the data is continuous from the previous data reproduction request, and when a series of data is divided and reproduced, the following data is stored in the data buffer before the data reproduction request. An information recording characterized by performing a read-ahead process for reading and continuing the read-ahead process without interrupting the read-ahead when the continuous data detecting means determines that the data is continuous data when a data reproduction request is received during the read-ahead process. Playback device.