JPH0594672A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To make a response speed to a host computer quick by giving a response to the host computer the highest priority and optimizing a read-in order such that seek numbers of a reproducing head become minimum. CONSTITUTION:The data from a head in a reading range of a recorded data of an information recording medium requested from the host computer 11 to give the highest priority to the transfer of the data to the host computer 11 to just before the first defective sector, is read out in a buffer RAM 18 and also the reading-in order between other data in the requesting range is optimized and the data is read out respectively at a correspondence position of the buffer RAM 18. Thus an execution speed reading in information is realized at a greatly higher speed and the response speed to the host computer is remarkably improved.

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 or reproducing information by using an information recording medium capable of rewriting information.

[0002]

2. Description of the Related Art Conventionally, since an information recording medium such as an optical disk has a relatively high error rate, it is common to prepare a substitute sector for replacing a defective sector in advance as a remedy. Is. Therefore, if the data cannot be normally written in the designated sector due to a defect, the data is written in a previously prepared alternative sector, and so-called replacement processing is performed. In this case, the replacement management information that associates the defective sector with the replacement sector is registered in the memory of the controller in the apparatus each time replacement processing occurs. The replacement management information is sorted in the order of occurrence of replacement processing. On the other hand, when a read request is issued to the information recording / reproducing apparatus from a higher-level control apparatus such as a host computer,
The controller determines whether or not there is a replaced sector within the required range of the recording medium by checking the replacement management information registered in the memory. Normally, the controller has a buffer memory in order to speed up the transfer speed with the host computer, and if there is a read request, the controller continuously reads data as long as the size of the buffer memory allows. If there is a replaced sector within the required range, read up to the sector immediately before that and start the transfer to the host computer.
At the same time, the read head is sought to the alternative sector to read the alternative sector. When this ends, seek is performed immediately after the sector that was replaced again, and reading is started from the sector immediately after that. In the case of reproducing information in this way, if there is a replaced sector within the requested range, the information is read by seeking to the alternative sector each time.

[0003]

However, in the above-mentioned conventional information recording / reproducing apparatus, if there is a defective sector during the reading of data, the transfer of data to the host computer is temporarily interrupted, and seek to an alternative sector is performed. Further, after reading the alternative sector, it is necessary to seek again to the sector next to the defective sector. Moreover, since the seek operation needs to be performed twice each time the defective sector is encountered, the execution speed of the read operation becomes slow and the response speed to the host computer becomes extremely slow.

The present invention has been made in order to solve such a problem, and its purpose is to give priority to the response to the host computer, and within the read request range so as to minimize the number of seeks of the reproducing head. It is an object of the present invention to provide an information recording / reproducing apparatus capable of significantly improving the response speed to the host computer by optimizing the reading order of the data of the alternative sector of the defective sector and other data.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to temporarily store data transferred from a host control device and transferred from the host control device, or to temporarily reproduce data to be transferred to the host control device. In an information recording / reproducing apparatus having a buffer memory for storing, in order to give the highest priority to data transfer to the upper control device, from the beginning of the read range of the recording data of the information recording medium requested by the upper control device. The data up to immediately before the first defective sector is read into the buffer memory, and the data of the alternative sector of the defective sector within the read request range and other data within the read request range are set so that the number of seeks of the read head is minimized. It is achieved by an information recording / reproducing apparatus characterized by optimizing a reading order with respect to the data of the .

[0006]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the information recording / reproducing apparatus of the present invention. In FIG.
Reference numeral 10 is an information recording / reproducing apparatus, and 11 is a host computer which is a host controller. Information recording / reproducing apparatus 1
0 is connected to the host computer 11, and recording or reproduction of information is performed based on an instruction from the host computer 11. Reference numeral 12 is a SCSI adapter that interfaces with the host computer 11, 13 is an MPU that performs overall control of the information recording / reproducing apparatus 10, 14 is a ROM that stores control programs, and 15 is an ECC circuit that performs error correction processing. is there. Further, 16 is an I / 0 control unit,
Reference numeral 17 denotes a disk R / W unit for recording information on an optical disk 19 used as an information recording medium or reproducing the recorded information, and 18 temporarily storing data transferred from the host computer 11, It is a buffer RAM for temporarily storing the reproduction data to the host computer 11. The disk R / W unit 17 is provided with a recording / reproducing head, which moves in the radial direction of the optical disk 19 to record information at an instructed address of the optical disk 19 or information of an instructed address. To play.

Next, the operation of reading information according to the present embodiment will be described. First, when there is no replacement sector in the read request range designated by the host computer 11, the MPU 13 continuously reads from the first sector to the last sector designated by the host computer 11 so that the disk R / W unit 1
Instruct 7. The MPU 13 stores the read data in the buffer RAM 18, and when the data of the first sector is taken into the buffer RAM 18, the MPU 13 starts the transfer of the reproduction data to the host computer 11. If there is one replacement sector in the read request range, first M
As shown in FIG. 2A, the PU 13 controls to continuously read the data area A from the beginning of the read request to the sector before the replacement sector B where the replacement has occurred, and the read data area A 2B, the data is stored in the reading order from the head position of the buffer RAM 18, as shown in FIG. Next, the MPU 13 controls to continuously read the data in the data area C from the sector next to the replacement sector B to the last sector of the read request without reading the data in the replacement sector B in which the replacement has occurred. Then, the read data is shown in FIG.
As shown in, the data is recorded in the corresponding area of the buffer RAM 18. After that, the MPU 13 sets the disc R / W unit 17
Is controlled to seek to the alternative sector X which is the replacement destination of the replacement sector B, and the read data of the replacement sector X is stored in the corresponding area of the buffer RAM 18. In addition, MPU
When the data is stored at the head position of the buffer RAM 18, the data 13 starts transferring the reproduction data to the host computer 11.

Next, when there are a plurality of replacement sectors in the read request range, the MPU 13 first, as shown in FIG. 3A, the data area from the beginning of the read request to the sector before the first replacement sector B1. It is instructed to continuously read the data of A, and the read data is stored in the buffer RAM 18 in the order of reading from the beginning as shown in FIG. At the same time, when the first data of the read request is stored at the head of the buffer RAM 18, the MPU 13 starts transferring the reproduction data to the host computer 11. Then MPU1
Reference numeral 3 seeks the reproducing head to the alternative sector area, and controls so as to continuously read the data of the alternative sectors X1, X2 and X3 of the replacement sectors B1, B2 and B3. The data read here is stored in corresponding positions in the buffer RAM 18 as shown in FIG. When the reading of the alternative sector is completed, the MPU 13 seeks the read head to the sector next to the first replacement sector B1, and controls so as to continuously read the data of the data areas C, D and E from this sector. In the middle of reading this data, the replacement sector B2
Although there is B3, this replacement sector is skipped and read. The data read in this way is shown in FIG.
As shown in (b), they are stored in the corresponding positions of the buffer RAM 18, respectively. The data temporarily stored in the buffer RAM 18 is sequentially transferred to the host computer, and when the last data in the read request range is transferred, all the processing ends.

[0009]

As described above, according to the present invention, the reading of information is executed by giving the highest priority to the response to the host controller and optimizing the reading order so that the number of seeks of the reproducing head is minimized. There is an effect that the speed can be significantly increased and the response speed to the host control device can be significantly improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an information recording / reproducing apparatus of the present invention.

FIG. 2 is an explanatory diagram showing a recording area and a replacement area when there is one defective sector within a read request range, and a state in which data of the replacement sector of the recording area and the replacement sector is stored in a buffer RAM. ..

FIG. 3 is an explanatory diagram showing a recording area and a replacement area when there are a plurality of defective sectors within a read request range, and a state in which data of a replacement sector of the recording area and the replacement area is stored in a buffer RAM.

[Explanation of symbols]

 10 information recording / reproducing apparatus 11 host computer 13 MPU 15 ECC circuit 17 disk R / W section 18 buffer RAM 19 optical disk

Claims (1)

[Claims] 1. An information recording / reproducing apparatus, which is connected to a higher-level control device and includes a buffer memory for temporarily storing data transferred from the higher-level control device or temporarily storing reproduction data transferred to the higher-level control device. In order to give the highest priority to the transfer of data to the host controller,
The read request range is read so that the data from the beginning of the record data read range of the information recording medium requested by the host controller to just before the first defective sector is read into the buffer memory, and the read head seek count is minimized. An information recording / reproducing apparatus characterized by optimizing the reading order of the data of the alternative sector of the defective sector and the other data within the read request range, and reading them to the corresponding positions of the buffer memory.