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SAMSUNG HARD DISK DRIVE
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X
Write Head: All heads are progressed to write at the last cylinder (ID region).
If it is fail to write due to cylinder error, p rogress again in the next inner cylinder.
Record failure status to the corresponding head after progress error check to all 10
cylinders.( e.g.: Head 0
W
Fail, Head 1
W
Pass ... )
Y
Read Head: Seek 100 cylinders per OD, MD, ID regions
W
remark "failure" if error occurred in
3 times per region. ( Judge failure by reading not the whole cylinder but
servo sector only because it is apt to mistake failure to head failure due to scratch)
PES Check (PES, RCO, Mechanism)
: Compare PES value from the first cylinder starting OD(except MC ),MD,ID region to the 3rd
cylinder. (Check 3 0 times per 1 cylinder)
W
Remark "failure" when error occurred more than
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