Adaptive Write-Inhibit Architecture
Original Publication Date: 1997-May-01
Included in the Prior Art Database: 2005-Apr-01
Publishing Venue
IBM
Related People
Ohsawa, T: AUTHOR [+3]
Abstract
Disclosed is a Hard Disk Drive which has an adaptive write-inhibit criteria for each head. With a higher recording density and a multiple source of heads and disks, write-width tolerance of each head cannot be ignored. Thus, a write-width screening test was implemented to protect data lost from squeeze write of an adjacent track (Figure). To achieve a higher manufacturing yield and assure Hard Disk Drive quality, adjust write inhibit criteria by each head and disk combination in the manufacturing test process.
Adaptive Write-Inhibit Architecture
Disclosed is
a Hard Disk Drive which has an adaptive
write-inhibit criteria for each head.
With a higher recording
density and a multiple source of heads and disks, write-width
tolerance of each head cannot be ignored.
Thus, a write-width
screening test was implemented to protect data lost from squeeze
write of an adjacent track
(Figure). To achieve a higher
manufacturing yield and assure Hard Disk
Drive quality, adjust write
inhibit criteria by each head and disk combination in the
manufacturing test process.
The following describes the basic concepts of this
article:
1.
Prepare a table for the write inhibit value of each head
on the disk.
2.
Measure write width of each head in a manufacturing test
process.
If write width of a head is
narrower than design
target, then set
Write Inhibit = Default value + A
(value A can be
changed by program)
If write width of a head is wider
than design target,
then set
Write Inhibit = Default value - A
(value A can be
changed by program)
3.
Do Write Width Screening Test for each head.
If a head is failed at the Write
Width Screening test,
then set
Write Inhibit = Write Inhibit - B
(value B can be changed
by program)
and do Write Width screening Test
again.
T...