Secure Delete Options
Secure Delete Options |
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Secure Delete provides you six wiping methods. Secure wiping depends upon two methods.
1. Number of Wipes - More the wipe passes more security.
2. Random data use for secure wipe - More random data more difficult to determine the contents on the disk.
Currently Secure Delete supports following wiping methods:
Zero Fill the Data Stream:
The disk spaced used by data is overwritten by zeros. This is the fastest but
the least secure algorithm. It provides moderate level of safety. Undelete
tools become useless as data is gone. Data can be recovered using microscopic
examination of disk. Very Fast.
Pseudo Random Numbers: This is more secure than the above zero fill
data stream. The data is overwritten three times first by zero, then by 0xff
and then with random number. Undelete tools become useless as data is gone.
Chances are very dim for data to be recovered using microscopic
examination of disk.
American DoD 5220.22-M: This is more secure than the Pseudo Random
Numbers. The data is overwritten Four times. Undelete tools become useless as
data is gone. Chances are very very dim for data to be recovered using
microscopic examination of disk.
P. Gutmann Specification (35 Wipes)
: P. Gutmann in his paper Secure Deletion of Data from
Magnetic and Solid-State Memory specified how to erase data securely.
Undelete tools become useless as data is gone. Microscopic examination
of disk will not reveal any data. Though very secure, it may take
a few minutes to wipe out 100 MB of data.
Custom Secure Algorithm (64 Wipes) :
This method is very secure. It uses
recommendation of various Government standard including that of United States,
Russia, Germany. Data deleted using this method is gone forever. Though very
secure, it may take a few minutes to wipe out 100 MB of data.
Custom x Wipes : It simply wipes the data x times (minimum 2 and maximum 99 passes) as specified by you as follows
1st Pass : Negates the data on the disk
2nd Pass: Fills the Data with zero
3rd Pass : Fill the data with 0xff
4th and above passes : Fills the data on the disk using random data.