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Disk drive with adaptive counting of writes to the data tracks

A technology of data tracks, disk drives, applied in alignment of tracks on disks, recording of information on disks, instruments, etc.

Inactive Publication Date: 2011-11-09
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The original fragment no longer exists and does not require memory to store its count

Method used

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  • Disk drive with adaptive counting of writes to the data tracks
  • Disk drive with adaptive counting of writes to the data tracks
  • Disk drive with adaptive counting of writes to the data tracks

Examples

Experimental program
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Embodiment Construction

[0013] figure 1 is a block diagram of a magnetic recording disk drive (HDD) 10 according to the present invention. HDD 10 includes a hard disk controller (HDC) 12, which may include and / or be implemented by a microcontroller or microprocessor. Controller 12 executes a computer program stored in memory 14 and embodying logic and algorithms described further below. Memory 14 may be separate from controller 12 or as embedded memory on the controller chip. Computer programs may also be implemented in microcode or other types of memory accessible to controller 12 .

[0014] The controller 12 is connected to a host interface 16 that communicates with a host computer 18 . Host computer 18 may be a portable computer operating on battery power. Host interface 16 may be any existing computer-HDD interface, such as Serial ATA (Advanced Technology Attachment) or SCSI (Small Computer System Interface).

[0015] Although figure 1 The top view of FIG. 1 shows only a single disk 24 and ...

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PUM

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Abstract

A hard disk drive (HDD) uses adaptive counting of writes to the data tracks to minimize the effect of adjacent track encroachment (ATE). The tracks are grouped into segments and a counter is associated with each segment, but the number of tracks in a segment varies or adapts depending on the number of writes to the segment. When the count for the number of writes to a segment reaches a threshold, the segment is divided into a number of segments with fewer tracks. The original segment no longer exists and does not require memory to store its count. This process continues until a segment reaches a predetermined minimum number of tracks. When the count for the number of writes to a segment with the minimum number of tracks reaches a threshold, all of the tracks in that segment, and tracks radially adjacent to and on both sides of the segment, are read and rewritten.

Description

technical field [0001] The present invention relates generally to magnetic recording hard disk drives (HDDs), and more particularly to counting the number of writes to a data track to minimize the effect of adjacent track encroachment (ATE) during writing. Density HDD. Background technique [0002] HDDs with high data density need to have high data track density, which means squeezing concentric data tracks closer together. High track density increases the problem of adjacent track encroachment (ATE). ATE occurs when old data stored in a track adjacent to the track being written becomes corrupted after multiple writes to the data track. ATE typically translates into an increase in bit error rate (BER), leading to a deterioration in HDD performance and reliability. [0003] One solution to the ATE problem is to count the number of writes per track. When a track has been written a predetermined number of times, the track and one or more adjacent tracks on either side are r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/48G11B5/596
CPCG11B19/041G11B5/012G11B19/045
Inventor 马科.桑维多
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV