How does wiping perform
A some quotation from the introduction:
"Deletion is not secure. When you delete a file
the first letter of the filename in a directory entry is changed to a
special character (hexadecimal code E5h). This is a special tag that
tells the system this file has been deleted and the space is
free. In fact the files data remains on the disk. It may remain
on the hard drive until it is overwritten or remain till you sell your
hard drive. Whatever the case your sensitive files can be recovered.
So that is the answer to why we have to use a good file shredder
the secure deletion algorithms performs the overwriting of your
There are several algorithms to secure deletion:
Single Pass data area is overwritten once with 1 or
DoD Method the data area is overwritten with 0s, then
1s and then once with pseudorandom data.
Guttman Method the data area is overwritten 35 times. This
method overwrites the drive taking into account the different encoding
algorithms used by various hard drive manufacturers.
NSA erasure algorithm data is overwritten seven times with
0 pattern then with 1 and so on. It is the best method for
quick and secure deletion (QuickWiper can do it).
What algorithm does QuickWiper use?
QuickWiper can work in two modes - single pass erasure
algorithm (when the NSA option is checked off) and the NSA erasure
To apply the NSA erasure algorithm while wiping you
should check "Use NSA erasure algorithm" in "Wipe"
Note: you can skip any lesson and begin reading the
following by clicking "Next->" link. Each lesson
describes a separate idea so you will not lose anything. This lesson
course contains eight lessons (8) so you will spend just a 10 minutes
reading but after
reading all the eight lesson you will know how to wipe files, wipe
free disk space, clear IE history, temporary files and cache. Lessons
also have information about wiping algorithms, such as NSA erasure and
common tips and tricks for using QuickWiper.
Support - Download
QuickWiper - Buy