JPH04146574A - Cylinder skew method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cylinder skew method used in a magnetic disk drive.

BACKGROUND OF THE INVENTION FIG. 3 is a flowchart of the operation of a conventional cylinder skew method.

In FIG. 3, in step 101, the defect list recorded on the medium is read to determine the defective sector in that track, and in step 104, the number of cylinder skews is set as the number of sectors required for one toft seek, and the number of sectors in the previous cylinder is determined. In step 103, formatting is performed using a position shifted backward by the cylinder skew number with respect to the first sector of the last track of .

FIG. 4 shows an example formatted using the conventional cylinder skew method, in which replacement sectors are used as many as the number of defective sectors in the cylinder. When reading or writing from the last track of cylinder N to the first track of cylinder N+1 on a medium formatted as shown in FIG. It can be performed.

Problems to be Solved by the Invention However, in the above conventional cylinder skew method,
Even if a replacement sector is not used, the sector number is shifted by the same number, so even if you perform a one-track seek immediately after reading or writing the last sector of that cylinder,
There is a problem in that the first sector of the next cylinder cannot be read or written until the number of unused spare sectors has elapsed.

The present invention solves such conventional problems. Regardless of the number of alternate sectors used, after one track seek, the first sector of the next cylinder is read or written while waiting for a minimum deinuk rotation. be able to. The object is to provide a cylinder skew method.

Means for Solving the Problems In order to achieve the above object, the present invention provides a step of reading a defect list recorded on a medium to detect defective sectors within the cylinder, and detecting the number of sectors required for one track seek. and the number of spare sectors used in the previous cylinder plus the number of spare sectors per cylinder. This cylinder skew method includes a step of formatting the shifted part as the first sector of that cylinder.

Function The present invention uses the same number of replacement sectors as there are defective sectors, and calculates the number of replacement sectors per cylinder by adding the number of sectors required for one track seek and the number of replacement sectors using the previous cylinder to the cylinder skew number. Since the arrangement is such that formatting is performed as a number minus , it is possible to wait for a minimum amount of disk rotation when reading or writing across cylinders.

Embodiment FIG. 1 is a flowchart of the operation of a cylinder 7 cueing method according to an embodiment of the present invention.

In Fig. 1, in step 1, the defect list recorded on the media is read to determine the defective sectors in that track, and in step 2, the number of cylinder skews is calculated as the number of sectors required for one track seek and the number of sectors in the previous cylinder. Add the number of alternate sectors used in step 3 and subtract the number of alternate sectors per cylinder, and set the first sector as the first sector of the last track of the previous cylinder by the number of cylinder skews. Format.

The format shown in FIG. 2 according to the above embodiment uses the same number of replacement sectors as there are defective sectors in the cylinder.

In media formatted as shown in Figure 2,
Cylinder N last track - Cylinder N+1 When reading or writing the first track, the cylinder N last track last sector and the cylinder N+1 first track first sector are:
Since the discs are shifted by the number of sectors required for one track seek, there is an effect that a minimum amount of disk rotation can be required when reading or writing across cylinders.

Effects of the Invention As is clear from the above embodiment, the present invention performs formatting using a cylinder skew number that takes into account the number of alternate sectors used, and performs read or write across cylinders. Therefore, it is possible to provide a cylinder skew method that minimizes the waiting time for disk rotation.

[Brief explanation of drawings]

FIG. 1 is a flowchart of the operation of a cylinder skew method according to an embodiment of the present invention, FIG. 2 is a diagram of a media format according to the same embodiment, FIG. 3 is a flowchart of the operation of a conventional cylinder skew method, and FIG. FIG. 2 is a diagram of a format of a medium using a conventional cylinder skew method. 1... Step of checking defective sectors from defective lines on the media, 2... Step of setting cylinder skew number, 3... Step of formatting. Name of agent: Patent attorney Akira Okaji and two others

Claims (1)

[Claims] In the cylinder skew method, which has a replacement sector at the end of the last track of each cylinder and formats by shifting the sector number for each cylinder, defective sectors in that cylinder are detected by reading the defect list recorded on the media. step, the step of setting the cylinder skew number as the number of sectors required for one track seek, the number of replacement sectors used in the previous cylinder, and the number of replacement sectors per cylinder, and The cylinder skew method comprises the step of formatting a sector shifted backward by the cylinder skew number as the first sector, and does not minimize the wait for disk rotation during reading and writing across cylinders.