JPH0562360A - System for processing defective sector of rotary type storage device - Google Patents

Abstract

PURPOSE:To attain a high speed for processing defective sectors by comparing the position of the defective sector in a storage table with the position of the sector in a position detecting part and prohibiting, at the time of inequality, the generation of read gate signals. CONSTITUTION:By a control part 10, a storage disk drive 2 is controlled under the instruction from a host device 3, and by the drive 2 a head is accessed and data are read against a rotating storage medium. Then, by the control part 10, the read gate signal of an ID part is generated synchronously with the sector pulse from the drive 2, and the ID part of the drive 2 is identified. In the control part 10, the storage table 11, a sector position detecting part 12, a mask circuit 14 and a gate pulse generating circuit 15 are provided. By the table 11 the position of the defective sector is stored, and by the detecting part 12 the sector position whose sector pulse is counted is held. Here, the sector position of the table 11 and that of the detecting part 12 are compared 13; if it is unequal, the generation of the read gate signal of the ID part is inhibited by the circuit 15 by means of the sector pulse of the sector 14, and defective data are skipped to process the defective sector at a high speed.

Description

Detailed Description of the Invention

(Table of Contents) Industrial Application Field of the Prior Art (FIG. 4) Problem to be Solved by the Invention Means for Solving the Problem (FIG. 1) Action Example (a) Description of One Example (FIG. 2) To FIG. 3) (b) Description of another embodiment Effect of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defective sector processing method for a rotary memory device such as a magnetic disk device, which skips defective sectors. With the recent demand for larger capacity of magnetic disk devices, the density of magnetic disks has been increased, minute defects in magnetic disk media have also become a problem, and the number of defective sectors tends to increase.

For this reason, an alternate sector method has been proposed in which an alternate sector is provided for a defective sector of a track on the magnetic disk surface. However, in the alternate sector method, it takes time to search for the alternate sector and continuous blocks A method that does not use a replacement sector is adopted because it is disadvantageous in processing.

On the other hand, due to the demand for improvement in the transfer rate of the magnetic disk device, if the processing of defective sectors in the processing of continuous blocks is time-consuming, a rotation wait occurs. Therefore, a technique for processing defective sectors at high speed is required. ..

[0005]

2. Description of the Related Art FIG. 4 is an explanatory diagram of a conventional technique. As shown in FIG. 4, the magnetic disk device has a controller 1 connected to the upper rank 3, and a magnetic disk drive 2.
The controller 1 receives the sector pulse from the magnetic disk drive 2 and generates a read gate signal for the ID section,
The contents of the ID part of the sector are read, the contents of the ID part are analyzed, the sector is detected, and a read or write gate signal for the data part is generated to perform the read or write.

At this time, if there is a defective sector (2 in the figure) in the processing of continuous blocks, the ID part of the defective sector is read in order to skip the defective sector, and the ID competition is performed by analyzing the contents of the ID part. An error occurs, prohibiting the generation of read or write gate signals in the data section,
Shift to slip processing.

In the slip processing, it is analyzed whether the reason of the ID compare error is a read error or a defective sector, and
If there is information indicating a defective sector in the copy, it is determined to be a defective sector, and the subsequent processing command is reissued before moving to the next block. On the other hand, Japanese Patent Laid-Open No. 59-221810 discloses a method of skipping the ID portion of a defective sector without reading it.

In this method, the position of the defective sector is stored in all the sectors for the purpose of preventing the rotation waiting when the ID part is rewritten, and when the head reaches the target track, from the first sector. The position of the defective sector is read and held in the memory. When the sector immediately before the target sector is reached, it is determined whether the target sector is the defective sector held in the memory. I
The part D is skipped without being read.

[0009]

By the way, in recent years, due to the demand for improvement in data transfer rate, the number of revolutions of a magnetic disk is increased and the time required for processing one block is shortened. Therefore, the conventional technique has the following problems. In the former conventional technique, if the above-mentioned slip processing takes a long time, the next block cannot be made in time, rotation waiting occurs, and high-speed transfer and writing become difficult.

In the latter conventional technique, since the original purpose is to rewrite a single block, in the processing of consecutive blocks, the data is read or written in the previous sector, and then the next sector is identified. However, if it is the target sector, it is necessary to refer to the memory, judge whether it is a defective sector, and skip processing, it takes time to judge and process the defective sector, it is not in time for the next block, waiting for rotation occurs, High-speed transfer and writing become difficult.

Therefore, the present invention provides a defective sector processing method for a rotary memory device which speeds up processing of defective sectors and skips defective sectors in continuous block processing without causing a rotation wait. The purpose is to do.

[0012]

FIG. 1 shows the principle of the present invention. Claim 1 of the present invention relates to a rotating storage medium,
By the instruction from the storage disk drive 2 that accesses the head and reads at least the data, and the upper 3
And a control unit 1 for controlling the storage disk drive 2, wherein the control unit 1 generates a read gate signal for the ID section in synchronization with a sector pulse from the storage disk drive 2, In the rotary storage device that identifies the ID part from 2 and generates a read or write gate signal for the data part when the sector is the target sector, the control part 1 stores the defective sector position in the storage table 11.
And a sector position detector 12 for holding the sector position counting the sector pulse, and a mask circuit 1 for the sector pulse.
4 and a gate pulse generation circuit 15 for generating a read gate signal of the ID section by a sector pulse from the mask circuit 14, and the defective sector position of the storage table 11 and the sector position of the sector position detection section 12 are provided. And compare
According to the comparison result, the mask pulse is masked by the mask circuit 14, the generation of the read gate signal of the ID section from the gate pulse generation circuit 15 is prohibited, and the defective sector is skipped. ..

According to claim 2 of the present invention, in claim 1,
The control unit 1 is provided with a comparison circuit 13 for comparing the defective sector position of the storage table 11 and the sector position of the sector position detection unit 12.

According to a third aspect of the present invention, in the first aspect,
The control unit 1 includes a control circuit 10 which counts the sector pulses, stores the sector pulses in the sector position detection unit 12, and compares a defective sector position in the storage table 11 with a sector position in the sector position detection unit 12. It is characterized by

[0015]

According to the first aspect of the present invention, the storage table 11 for storing the defective sector position, the sector position detecting section 12 for holding the sector position for counting the sector pulse, the mask circuit 14 for the sector pulse, and the mask circuit 14 are provided. Since the gate pulse generating circuit 15 for generating the read gate signal of the ID section is provided by the sector pulse from, the defective sector position of the storage table 11 and the sector position of the sector position detecting section 12 are compared and compared. Based on only the result, the mask pulse is masked by the mask circuit 14 and the generation of the read gate signal of the ID section from the gate pulse generation circuit 15 is prohibited, so that the defective sector can be skipped, so that the defective sector can be detected at high speed. In addition, since the mask circuit 14 and the gate pulse generation circuit 15 can skip the defective sector by hardware. Enough in time for the next block, or a continuous block processing, without causing rotational delay, skipping defective sectors can continue.

According to a second aspect of the present invention, the control unit 1 is provided with a defective sector position of the storage table 11 and a sector position detection unit 12.
Since the comparison circuit 13 for comparing the sector position of
In addition to the control circuit 10, the defective sector can be detected and skipped by hardware, and the defective sector can be detected and skipped at higher speed.

In the third aspect of the present invention, the control unit 1 counts the sector pulse and stores it in the sector position detection unit 12, and the defective sector position of the storage table 11 and the sector position detection unit 1.
Since the control circuit 10 for comparing the position of the second sector with that of the second sector is provided, it is possible to minimize the amount of additional hardware and detect and control the defective sector at high speed.

[0018]

【Example】

(a) Description of one embodiment FIG. 2 is a configuration diagram of one embodiment of the present invention, and FIG. 3 is an operation explanatory diagram of one embodiment of the present invention. In the figure, the same parts as those shown in FIGS. 1 and 4 are indicated by the same symbols, and 10 is a control circuit, which is composed of an MPU, and a command with the upper 3
It exchanges status and sends and receives data.

The storage table 11 is composed of a memory,
The physical position of the defective sector is stored, and the sector position detection unit 12 is composed of a sector pulse counter, is reset by an index pulse from the magnetic disk drive 2, counts the sector pulse, and determines the physical position of the current sector. The comparison circuit 13 is shown in FIG.
The contents of 1 are compared with the contents of the sector pulse counter 12, and if they match, a low-level mask signal is generated.

The mask circuit 14 is composed of an AND gate and masks the sector pulse with a low level mask signal. The read / write gate pulse generation circuit 1
5 is ID by the sector pulse from the mask circuit 14.
A read gate signal for the data section is generated, and a read or write gate signal for the data section is generated according to a read / write instruction from the control circuit 10.

The bus 16 includes the magnetic disk drive 2 and
The control circuit 10 and the upper 3 are connected to exchange read data and write data. The operation of the read process shown in FIG. 3 will be described.

As shown in FIG. 3A, in the target track, physical sector numbers are attached as shown in the figure,
Assuming that the physical sector number “3” is a defective sector, the logical sector numbers are sequentially assigned except for the sector having the physical sector number “3” as shown in the figure. The storage table 11 stores the physical sector number “3” of the defective sector.

Here, when the consecutive block read processing of n blocks from the logical sector number "2" from the upper 3 is given to the control circuit 10, the sector pulse counter 12 is reset and enabled in synchronization with the index pulse. Then, the gate pulse generation circuit 15 is enabled.

As a result, the sector pulse counter 12
Indicates the current sector position by counting the sector pulse, and the content of the storage table 11 is compared with the comparison circuit 13.
If the comparison result shows no coincidence, the mask circuit 14 is opened, the sector pulse is input to the gate pulse generation circuit 15, the read gate signal of the ID section is output, and the magnetic disk drive 2 thereby detects the sector. The ID section is read and transferred to the control circuit 10 via the bus 16.

The control circuit 10 analyzes this ID portion, and if it is the target sector, instructs the gate pulse generation circuit 15 to generate a read gate signal for the data portion, and the gate pulse generation circuit 15 causes the data portion to be read. Then, the magnetic disk drive 2 reads the data portion of the sector and transfers it to the upper 3 via the bus 16.

On the other hand, when the comparison circuit 13 detects a comparison match, it outputs a low-level mask signal to the mask circuit 14. Therefore, as shown by the physical sector number "3" in FIG. It is masked and is not output to the gate pulse generation circuit 15.

Therefore, the read gate signal of the ID section is
Since it is not output to the magnetic disk drive 2, the ID part of the sector is not read, and the control circuit 10
No part is transferred, so no instruction is given to the gate pulse generation circuit 15. As a result, the physical sector number "3"
Sector is skipped as a defective sector.

The sector with the next physical sector number "4" is not registered in the storage table 11 as a defective sector. Therefore, the comparison circuit 13 does not show a match in the comparison result, so the mask circuit 14 opens. The sector pulse is input to the gate pulse generation circuit 15 to output a read gate signal for the ID section, and the magnetic disk drive 2 thereby reads the ID section of the sector and transfers it to the control circuit 10 via the bus 16. To do.

The control circuit 10 analyzes this ID section, and if it is the target sector, instructs the gate pulse generation circuit 15 to generate a read gate signal for the data section. Then, the magnetic disk drive 2 reads the data portion of the sector and transfers it to the upper 3 via the bus 16.

Thereafter, the continuous read processing is performed in the same manner. In this way, in the read process of the continuous block, the control circuit 10 is not burdened, the defective sector is detected, the output of the read gate signal is prohibited, and the defective sector is skipped. There is no waiting for rotation.

(B) Description of Other Embodiments In addition to the above embodiments, the present invention can be modified as follows. Although the read processing of the continuous block has been described, the write processing of the continuous block can be similarly applied.

Sector pulse counter 12, comparison circuit 1
Although 3 has been described by hardware, these operations may be performed by program control of the control circuit 10. Even in this case, the control circuit 10 counts the sector pulse and
Since it suffices to make a comparison and the processing does not take time, it is possible to prevent the rotation waiting.

The present invention can also be applied to the case where one track has a plurality of defective sectors. When the defective sectors of a plurality of tracks are stored in the storage table, the control circuit 10 selects the defective sector position information of the target track of the storage table. May be.

Although the rotary storage device has been described as a magnetic disk drive, it can be applied to an optical disk drive and a magneto-optical disk drive. Although the present invention has been described with reference to the embodiments, various modifications are possible within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

[0035]

As described above, according to the present invention,
It has the following effects. The defective sector position of the storage table 11 is compared with the sector position of the sector position detection unit 12, and the sector pulse is masked by the mask circuit 14 according to the comparison result, and the read gate signal of the ID part from the gate pulse generation circuit 15 is output. Since the generation of the defective sector is skipped and the defective sector is skipped, the defective sector can be detected and skipped at high speed.
High-speed transfer and high-speed writing are possible. You can add a small amount of hardware for this purpose,
Performance can be improved easily and at low cost.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a configuration diagram of an embodiment of the present invention.

FIG. 3 is an operation explanatory diagram of the embodiment of the present invention.

FIG. 4 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 1 Controller (Control Unit) 2 Magnetic Disk Drive (Storage Disk Drive) 3 Upper Device 10 Control Circuit 11 Storage Table 12 Sector Position Detection Unit 13 Comparison Circuit 14 Mask Circuit 15 Gate Pulse Generation Circuit

Claims (3)

[Claims] 1. A storage disk drive (2) for accessing a head to a rotating storage medium to read at least data, and controlling the storage disk drive (2) according to an instruction from a host (3). A control unit (1), the control unit (1) generates a read gate signal for the ID unit in synchronization with a sector pulse from the storage disk drive (2), and the storage disk drive (2) In the rotary type storage device which identifies the ID part from (1) and generates a read or write gate signal of the data part when the sector is the target sector, the control part (1) stores a defective storage table (11). ), A sector position detection unit (12) for holding the sector position counting the sector pulse, a mask circuit (14) for the sector pulse, and a sector from the mask circuit (14). And a gate pulse generating circuit (15) for generating a read gate signal of the ID section is provided, and the defective sector position of the storage table (11) is compared with the sector position of the sector position detecting section (12). According to the comparison result, the sector pulse is masked by the masking circuit (14), and the I pulse from the gate pulse generating circuit (15) is
A defective sector processing method for a rotary memory device, characterized in that the generation of a read gate signal of section D is prohibited and the defective sector is skipped. 2. The control unit (1) includes a defective sector position of the storage table (11) and the sector position detection unit (1).
2. The defective sector processing system for a rotary memory device according to claim 1, further comprising a comparison circuit (13) for comparing the sector position of 2). 3. The control unit (1) counts the sector pulses and stores the sector pulses in the sector position detection unit (12), and the defective sector position of the storage table (11) and the sector position detection unit (12). 3. The defective sector processing method for a rotary memory device according to claim 1, further comprising a control circuit (10) for comparing the sector position of (1) with the sector position of (3).