When a PC that has been used for the storage of confidential
data is sold on the open market the:
A. hard disk should be demagnetized.
B. hard disk should be mid-level formatted.s
C. data on the hard disk should be deleted.
D. data on the hard disk should be defragmented.
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Answer: A
The hard disk should be demagnetized since this will cause
all of the bits to be set to zero thus eliminating any
chance of information, which was previously stored on the
disk, being retrieved. A mid-level format does not delete
information from the hard disk. It only resets the directory
pointers. The deletion of data from the disk removes the
pointer to the file, but in actual fact leaves the data in
place so, with the proper tools, the information can be
retrieved. The defragmentation of the disk does not cause
information to be deleted, but simply moves it around to
make it more efficient to access.
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