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3-166 [CONFIDENTIAL]) PORTÉGÉ R700 Series Maintenance Manual (960-833))
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 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