JPH0258768A - Disk controller - Google Patents

Abstract

PURPOSE:To prevent occurrence of waiting time for rotation caused by an ID section reading-out error by not performing data writing in a disk device, but saving the data to a memory means when positional collation is unsuccessful and writing the data saved to the memory means in the disk device after completing a series of writing operations. CONSTITUTION:At the time of writing data in a disk device 2, writing operations are started after a position detecting means 3 detects that a recording and reproducing means reaches a prescribed position on a recording medium, and when collation of an ID section is unsuccessful, the data writing in the disk device 2 is stopped, but the data are written in a memory means 6 for preservation. The data saved to the memory device 6 are transferred to the disk device 2 after a series of writing operations are completed. Because of the above-mentioned operations, a host device can write data in the disk device 2 at the same transferring speed as that exerted when ID section collation is successful even when the ID section collation is unsuccessful. Therefore, waiting time for rotation caused by an ID section reading-out error does not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a disk control device that controls the operation of a disk device used for recording digital data.

(Prior art) In digital data processing, disk drives that use disk-shaped storage media are often used as well-balanced recording devices because they have high speed, large capacity, random access, and low bit cost. . When reading and writing data to and from a disk device, some formatting is required, and the format shown in FIG. 4 is usually used. A recording area called a track T provided on the storage medium is divided into a plurality of sectors S, and each sector S is further divided into an ID section a and a data section S. The ID section a is an area in which information indicating the start and address of a sector is recorded by a recording/reproducing means (for example, a magnetic head in a magnetic disk device), and the data section is an area in which data corresponding to the address is recorded. be.

Currently, such disk devices have unavoidable data read errors, and even though the recording/reproducing means is located at a predetermined position on the recording medium, it may not be possible to perform position verification with respect to the ID section. . If the TD section cannot be verified, wait for the disk to rotate once (wait for rotation),
The ID section will need to be checked again.

(Problem to be solved by the invention) By the way, when using a disk device as a data recording device that continuously records a large amount of data that is generated continuously in real time, the rotation wait due to an error in reading the ID section is - There is a problem that the transfer speed of the disk device may sometimes decrease.

Therefore, the boss 1 side of the disk device must have a large capacity buffer memory for waiting for rotation.

Therefore, the present invention has been made to eliminate the above-mentioned drawbacks. Even if the ID part verification fails due to an ID part reading error, the host device assumes that the ID part verification is always successful and maintains a constant transfer speed. The object of the present invention is to provide an disk device that can send data to a disk device.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the disk control device according to the present invention has a recording/reproducing means for reading data onto a recording medium, a position detecting means for detecting whether the data is in a certain position; a memory means for evacuating data when position verification fails during data writing; A write control means for saving data and writing the data saved in the memory means to the disk device after a series of write operations is completed.

(Function) When writing data to a disk device, the writing operation is started after the position detecting means determines that the recording/reproducing means is at a predetermined position on the recording medium, and if the ID section verification fails. At this time, data writing to the disk device is stopped and data is written and stored in the memory means instead. The data saved in the memory means is transferred to the disk device after a series of write operations are completed.

Through the above operations, even though an ID section mismatch occurs in the disk device, it is possible for the host device to write data at the same constant transfer speed as when the ID section mismatch does not occur. . This eliminates the need for a rotation wait due to an ID section read error.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a disk control device according to the present invention, in which a control section 1 has a built-in μ-CPU, and controls the operation of the entire device and the disk device 2 of this embodiment. I'll go. The disk control section 3 controls and detects the position of the recording/reproducing means (not shown) in the disk device 2, converts the data written to the disk device 2 into a preset format, and stores the read data in the ID section a. It performs various control operations such as separating the data section and the data section. The memory control unit 4 controls the operations of the first memory means 5 and the second memory means 6 in the present example device. The first memory means 5 operates as a pig buffer necessary for data transfer between a host side device (not shown) and the disk device 2. The second memory means 6 is for saving data when the ID section does not match. 1st. As the second memory means 5 and 6, for example, a semiconductor IC memory can be applied.

Here, this second memory means 6 corresponds to the memory means in the present invention. Further, the control section 1, disk control section 3, and memory control section 4 constitute a write control means in the present invention. Sl to S
8 is a signal bus, and Dl to D5 are data lines.

Next, the operation of the embodiment device configured as described above will be explained using the timing diagram at the time of data writing shown in FIG.

The control unit 1 receives a transfer request (Sl) from the host device via the host interface unit 7 (S2) and starts a control operation. First, the control section 1 sends address information related to position control of the recording/reproducing means to the disk device 2 to confirm operation (S3), and then instructs the disk control section 3 and memory control section 4 to transfer data. (S2). The memory control section 4 outputs a transfer permission signal @(34, 35) to the host device via the host interface section 7, and data is sent from the host device (31.Dl> and the first memory means 5).
(D2) control (S5) is performed. The disk control section 3 detects the rotational position of the disk. An index signal (FIG. 2(a)) indicating the position of the recording/reproducing means on the recording medium is sent from the disk device 2.
and a sector signal (FIG. 2(b)) are output (S3).

The index signal, not shown in FIG. 2(a), is a pulse signal indicating a rotation reference, and is output once every time the recording medium rotates once. The sector signal is a pulse signal indicating the start of the sector as shown in FIG. 2(b). When the recording/reproducing means reaches a predetermined position on the recording medium where data should be written, the disc control unit 3 reads the ID part from the disc device 2 and confirms the position (FIG. 2(C)).
). When the ID section verification is successful, the disk control section 3 interlocks with the memory control section 4 (36) L, and the first
Read out the data stored in the memory means 5 of
3), write to the disk device 2 (D4 in FIG. 1 and (d) in FIG. 2). When a mismatch occurs in the ID section, the disk control section 3 notifies the memory control section 4 of this fact (S3), and interrupts data writing to the disk device 2. The memory control unit 4 performs control to write data that should originally be written in the disk device 2 to the second memory means 6 (D5) (FIG. 1, 37, and FIG. 2, (e)). At the point when a series of data writing is completed, the control section 1 writes the second memory means 6.
The existence of saved data is checked, and if there is saved data, the disk control unit 3 and memory control unit 4 are instructed to write the saved data to the disk device 2 again. FIG. 3 is a flowchart summarizing the above operations.

First, in step B, the controller (μmcpu>1) sends the sector information and ID information for one track to the disk controller 3, and based on this, the disk controller 3 selects the write sector from the rotation timing signal as in step B. decide.

Next, in step C, ID part verification is performed, and when normal (
If successful, the process proceeds to step D, and if abnormal (unsuccessful), the process proceeds to step E.

In step D, data is written to the disk device 2 by the disk control unit 3, and at the same time,
In step F, the memory control unit 4 saves the data to the second memory 6.

Subsequently, in step F, it is confirmed whether or not it is the final sector. If it is the final sector, the process advances to step G, and if it is not the final sector, the process returns to step B again.

In step G, the result is sent to the control unit 1, and in step H, the control unit 1 confirms whether or not the input has been completed. If the input is completed, proceed to step ■, and if not completed, return to step A again. .

Next, in step I, the presence or absence of saved data is confirmed, and if there is, the process advances to step J, and if there is no data, the process jumps to the next step. In step J, the data saved in the second memory 6 is retrieved by the disk control unit 3 and the memory control unit 4 under the control of the control unit 1 and written to the disk device 2, as in step J. The series of operations ends.

As described above, according to this embodiment, even if an ID section mismatch occurs, it can be saved to the second memory means 6, and the host device can maintain a constant transfer rate regardless of whether the ID section matching is successful or not. Data can be written to the disk device 2 using the following steps.

Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above embodiment, and that various modifications can be made.

For example, in the above embodiment, the data writing position was detected based on the rotational position signal output by the disk device 2, but in a disk device using a parallel transfer method that can simultaneously drive multiple recording and reproducing means in parallel, ID section verification is required. This is possible for each channel, and position detection is possible by checking the ID part information.

At this time, the data of the channel in which the ID part mismatch has occurred, or the data of all channels, may be saved in the second memory means 6 without being written to the disk device 2.

[Effects of the Invention] As described in detail above, according to the present invention, data can be written from the host device to the disk device at a constant transfer speed regardless of whether the ID section verification is successful or not, so errors in reading the ID section can be avoided. There is no waiting time for rotation.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of a disk control device according to the present invention, FIGS. 2(a) to (e) are timing diagrams showing control of this embodiment, and FIG. 3 is an operation of this embodiment. FIG. 4 is a flowchart showing an example of the format of a disk device. DESCRIPTION OF SYMBOLS 1... Control part, 2... Disk device, 3... Disk control part, 4... Memory control part, 5... First memory means, 6... Second memory means, 7...Host interface section.

Claims (1)

[Claims] In a disk control device that records and reproduces data on a disk-shaped storage medium, a position detection means that detects the position on the recording medium of a recording and reproduction means that reads and writes data to and from the recording medium; a memory means for saving data when position matching fails during data writing;
and write control means for saving data in the memory means without writing data to the disk device when position verification is unsuccessful, and writing the data saved in the memory means to the disk device after a series of write operations are completed. A disk control device characterized by: