JPH0896519A - Medium fault information recording method for magnetic disk device - Google Patents

Abstract

PURPOSE: To eliminate an ID part from the data storage area and to enlarge the recording capacity by recording medium fault information with a clock synchronized with servo information. CONSTITUTION: The medium fault information area 3 for storing medium fault information is provided between a servo information area 2 and a burst pattern area 4, and the medium fault information is recorded on the medium fault information area 3 at the clock synchronized with the servo information stored in the servo information area 2. Thus, when the data are read out, positioning operation of a magnetic head is performed by the servo information recorded on the area 2, and the medium fauit information is read out from the area 3 at the time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium defect information recording method for a magnetic disk device, and more particularly to a medium defect information recording method for a sector servo type magnetic disk device.

[0002]

2. Description of the Related Art FIG. 2 is a format diagram showing an example of a servo data storage area according to a medium defect information recording method of a conventional magnetic disk device.

In the magnetic disk device, when a part of the data storage area of the magnetic disk, which is a recording medium, has a defect, and therefore information cannot be stored in that part, information about the defective part and its substitute are used. If it is necessary to record information about the part to be used (medium defect information) in the magnetic disk and record the information in the defective part, record the information in the alternative part and read the data from the defective part. At the time of writing, the alternative portion is recognized from the medium defect information and the information is read from that portion. However, in the conventional sector servo type magnetic disk device, such recording of the medium defect information is performed by As an area for recording medium defect information in a part of the data storage area that is the area for storing normal data in a sector, The provided ID portions to keep write the number and head number and sector number and flag, have specified an alternate sector to the ID unit, when instructed to read the data from the defective sector,
The method of reading data from the alternative sector is adopted.

On the other hand, as shown in FIG. 2, a servo information storage area for recording servo information for positioning the magnetic head has a synchronization pattern for holding an AGC gain for automatic gain control, as shown in FIG. AGCSY to remember
The NC area 11, the servo mark which is a flag for indicating that the servo address information is written, and the medium 1
A servo information area 12 in which an index mark, which is data for outputting a high-level signal only once per rotation, and data such as a cylinder address indicating a cylinder number are written, and position information is written. It has a burst pattern area 14 and a PAD area 15 which is an area for absorbing a timing error.

[0005]

As described above, in the conventional magnetic disk device of the sector servo system, the method of recording the medium defect information in the ID portion provided in a part of the data storage area is adopted. Therefore, there is a drawback that the data storage area becomes narrower by that amount, and therefore the storage capacity of the magnetic disk device becomes smaller.

[0006]

A medium defect information recording method for a magnetic disk device according to the present invention is a medium defect information recording method for a sector servo type magnetic disk device, wherein a servo information area in a servo data storage area is provided. And a burst pattern area, a medium defect information area for storing medium defect information is provided, and the medium defect information is recorded in the medium defect information area with a clock synchronized with servo information.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a format diagram showing an example of a servo data storage area according to an embodiment of the present invention.

In this embodiment, as shown in FIG. 1, an AGCSYNC area 1 for storing a synchronization pattern for holding a gain for automatic gain control and a servo address information are written in a servo data storage area. Servo information area 2 to be stored, medium defect information area 3 for storing medium defect information, burst pattern area 4 for writing position information, and PAD for absorbing timing error. Area 5 is provided.

AGCSYNC area 1, servo information area 2, burst pattern area 4 and PAD area 5
Is used in the same way as the conventional magnetic disk device.

For the medium defect information, a medium defect information area 3 for storing the medium defect information is provided between the servo information area 2 and the burst pattern area 4, and the servo information area is stored in the medium defect information area 3. Recording is performed with a clock synchronized with the servo information stored in 2.

By doing so, when the data is read, the positioning operation of the magnetic head is performed by the servo information recorded in the servo information area 2. At this time,
The medium defect information can be read from the medium defect information area 3.

The medium defect information in the defect information area 3 is constructed as shown in Table 1, for example.

[0014]

[Table 1]

In the case of the example in Table 1, the medium defect information is composed of 3 bits, and the upper 2 bits indicate the presence / absence of a defect and the position of the alternative sector. The lower 1 bit is a check bit.

By doing so, it is not necessary to provide the ID portion in the data storage area, so that the data storage area can be expanded correspondingly, and therefore the storage capacity of the magnetic disk device can be increased.

[0017]

As described above, according to the medium defect information recording method of the magnetic disk device of the present invention, the medium defect information area for storing the medium defect information is provided in the servo data storage area, and By recording the medium defect information with a clock synchronized with the information, when the servo information is read for positioning the magnetic head, the medium defect information can also be read. Therefore, it is necessary to provide an ID section in the data storage area. There is an effect that the data storage area can be expanded correspondingly, and the storage capacity of the magnetic disk device can be increased accordingly.

[Brief description of drawings]

FIG. 1 is a format diagram showing an example of a servo data storage area according to an embodiment of the present invention.

FIG. 2 is a format diagram showing an example of a servo data storage area according to a medium defect information recording method of a conventional magnetic disk device.

[Explanation of symbols]

 1 ・ 11 AGCSYNC area 2 ・ 12 Servo information area 3 Medium defect information area 4 ・ 14 Burst pattern area 5 ・ 15 PAD area

Claims (2)

[Claims] 1. A method of recording medium defect information in a sector servo type magnetic disk device, wherein medium defect information is stored between a servo information area and a burst pattern area in a servo data storage area. A medium defect information recording method for a magnetic disk device, comprising: providing a medium defect information area, and recording the medium defect information in the medium defect information area with a clock synchronized with servo information. 2. The medium defect information is composed of 3 bits, and the upper 2 bits indicate the presence / absence of a defect and the position of a replacement sector,
2. The medium defect information recording method for a magnetic disk drive according to claim 1, wherein the lower one bit is used as a check bit.