Toshiba 960-809 manual Hard Disk Test

Tests and Diagnostics

3.35.6.6Hard Disk Test

1) Sequential read

This subtest performs a forward read operation (0 to Maximum) by 63 sectors.

2) Address uniqueness

This subtest writes unique address data to each sector of the HDD track-by-track. The data written to each sector is then read and compared with the original data. There are three ways the HDD can be read.

▼Forward sequential

▼Reverse sequential

▼Random

3) Random address / data

This subtest writes random data in a random length to random addresses. This data is then read and compared to the original data.

4) Cross talk & peak shift

This subtest writes eight types of worst pattern data (listed below) to a cylinder, then reads the data while moving from cylinder to cylinder. (Test the data interference in the neighbor track)

Worst pattern data	Cylinder
‘ B5ADAD ‘	0 cylinder
‘ 4A5252 ‘	1 cylinder
‘ EB6DB6 ‘	2 cylinder
‘ 149249 ‘	3 cylinder
‘ 63B63B ‘	4 cylinder
‘ 9C49C4 ‘	5 cylinder
‘ 2DB6DB ‘	6 cylinder
‘ D24924 ‘	7 cylinder

PORTEGE M780 Maintenance Manual (960-809) [CONFIDENTIAL] 3-179