Protecting
your privacy may be not so easy as you could think by only deleting
files from your computer. That
will NOT protect you!
As we mentioned before, all the data can be easily recovered by any
software recovery tool. So using TZ Shredder Protection tool will
keep you extremely safe.
The
Idea Behind :
Windows allocates clusters for new files (and extending existing files)
from one end of the disk and moving towards the other end. Accordingly,
the user for example if deleting files near the end of the disk, it
might be very long before those clusters get used again. Therefore,
the unallocated areas of the user's disk may contain bits and pieces
of those files that were deleted weeks or months ago, and thus information
could be vulnerable to anybody who knows where and how to look for
it.
Therefore, shredding a disk's free space ensures that any deleted
data stored in unallocated clusters will be completely shredded, and
all the bits and pieces of left over data from deleted files will
be destroyed.
Generally speaking Windows stores files using two
steps:
- A directory entry &
- A series of one or more clusters on a disk.
The directory entry contains all the information about that file (name,
size, data stamp info, and starting cluster number). The data of the
file is contained inside the clusters.
When the user deletes a file using windows the file's data doesn't
actually get deleted from disk. Windows simply marks the file's clusters
as available for reuse, then marks that file's directory entry as
deleted (from the directories available) by replacing the first character
of the file's name with a special character. Now if those clusters
don't get reused for another file, they are vulnerable and can be
retrieved by those who know where and how to look for it.
Adding one byte to the directory that was deleted will allow the retrieve
of the entire file that has been deleted. This is used in most of
the "Unerase" utilities functions.
Shredder makes it virtually impossible to retrieve data from a file
because it literally overwrites the file's data clusters before deleting
the file. A "quick" shred overwrites
the file once, filling its data clusters with zeroes. This is sufficient
to prevent casual efforts retrieve the data. A "Thorough"
shred overwrites the file maximum 10 times, using varying bit patterns
each time, so that the disk's magnetic contents are scrambled beyond
any possibility of recovery, even by those who might use dedicated
hardware to examine the disk. Shredder also scrambles the contents
of the file's directory entry so that "Unerase" utilities
can't tell either what the file's original name was, or where on disk
its data was stored.
The net result is that after you shred a file, its
data and all references to that data are gone for ever.
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