Toshiba PORTEGE R830 Maintenance Manual page 279

Tests and Diagnostics
3.35.6.6 Hard 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
' B5ADAD '
' 4A5252 '
' EB6DB6 '
' 149249 '
' 63B63B '
' 9C49C4 '
' 2DB6DB '
' D24924 '
3-170 [CONFIDENTIAL])
PORTEGE R830 Satellite R830 Series Maintenance Manual (960-880)
Cylinder
0 cylinder
1 cylinder
2 cylinder
3 cylinder
4 cylinder
5 cylinder
6 cylinder
7 cylinder