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Security
Generally considered to be the most secure named algorithm, the Peter Gutmann
method involves overwriting data on the storage device 35 times. This results
in very high security, meaning that even highly capable data recovery professionals
may not be able to recover even the slightest piece of previous data.
Time
As with all software erasure methods, there must be a compromise between security
and speed. Therefore due to the high security invloved in the Peter Gutmann
method, it can take an extremely long time to erase data. For instance, to
erase a modern hard drive would probably take over 24 hours. Time also varies
depending on factors such as device speed.
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