M40S
37
SAMSUNG HARD DISK DRIVE
Attachment3. Q&A
※
Customer's Q&A
1) What is "Bad Sector"?
Bad sector is divided physical Bad sector(Hard defect) and logical Bad sector(Soft defect).
①
Physical Bad sector
Visual defect occur in the surface of disk where is recorded data, it contain the minute
defect could che cking with electric microscope. The main occurring cause of physical bad
sector are particle,impact,vibration. Among them, impact is the most serious cause, this
affect other components and bad sector as well and get weak HDD status( noise,bad sector).
②
Logical Bad sector
We can't f ind physical error on the surface of disk where the real data recorded bu t
actually abnormal data recorded in this case. Physical bad sector occur due to sudden
effect(stoppage, unstable power, head mis-running d u e to imp act/vibration,un stable
finish, Virus,colloision with other hardware). But real data storage could not damaged,
if you over write data again, you can use newly reco rded data without problem.
But you'd better HDD installation in state of manufactured in factory to prevent next
data error.(After data back-u p)
③
Resolution for bad sector:
ⓐ
Self-examination by Shdiag program.
ⓑ
Progress low level format with clear HDD program.
2) The real product capacity is not consistent with capacity on window screen.
The reason of 4.3GB is displayed instead of 4.0GB is follows.(e.g. 4.3GB)
Generally 1K = 1000, but 1K = 1024 in case of computer.
The reason is that computer and OS can perceive only two number, 0 and 1.
So 10 square of 2 is recorded as 1024.(2^10=1024) User's capacity of HDD is
4,300,000,000 Byte, it is not changed but due to computer perceiving restriction method,
it looks capacity was reduced. Consequently remark is changed according to unit change,
the real capacity is not changed.
3) What is LBA,Large and Normal mode ?
LBA and Large mode of HDD is one of the method to recognize the high capacity HDD of
528MB more. LBA mode has been applied to SCSI, it recognize cylinder,head and sector
by the way of not three-dimensional but one-dimensional and n umbering the first sector
in form of block unit is to number 0 then the sector become a unit and the assigned number
become a address, then change those numbers into physical three-dimensional address of
cylinder,head and sector. At this time, LBA mode is useful if BIOS and Hard is applied.
In case of Large mode, if the number of cylinder is in between 1024~2048, divide that
value then multiple the number of head and we can use HDD which doesn't apply LBA mode
by setting for this meth od and we can just establish HDD capacity until 528MB in case of
Normal mode. But we don't produce HDD in normal mode any more. The difference of Large
and LBA is that LBA is recognized as the number of cylinder was reducing in half and the
number of head was raised double and Large mode is set as the same way of general Normal
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