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Samsung HARD DISK DRIVE Service Manual Page 11

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SAMSUNG HARD DISK DRIVE
Write Head: All heads are progressed to write at the last cylinder (ID region).
If it is fail to write due to cylinder error, progress 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
Read Head: Seek 100 cylinders per OD, MD, ID regions
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 30 times per 1 cylinder)
VANGO(VL40)
Fail, Head 1
Pass ... )
remark "failure" if error occurred in
Remark "failure" when error occurred more than
DD

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