Disk--Why need to wipe disk?
Have you ever wondered how programs such as Norton Utilities can
"undelete" a file that you deleted by mistake? Let me
explain how that works, and in the process, explain why deleting a
file doesn't really wipe all the data on the disk.
When you create any file on your hard disk, a marker is placed at
both the beginning and the end of the file. Anything in between
those two markers comprises the actual contents of the file. As long
as those markers exist, your computer knows not to try to store any
other data in the space occupied by that file.
When you delete a file, your computer wants to get you on your way
as soon as possible. So instead of wiping the entire file, your
computer simply removes those markers, leaving the actual file data
relatively intact. However, with the markers gone, the hard disk knows it's okay to use that physical space for some other file.
The end result is that the file data isn't really wiped out until
the hard drive puts something else in its place.
This is why "undelete" utilities have virtually a 100%
success rate when you run them immediately after an unintentional
deletion. Since you haven't had a chance to wipe the old data
with new data, these programs can figure out where the markers were
and then put them back. How do you make sure a file is totally and
permanently deleted ?
One of the easiest ways - although not always 100% effective - is to
simply defragment your hard disk. You can use the Defrag program
that comes with Windows.
When you defragment your hard drive, you rearrange the physical
locations of all the files on your hard disk for optimum disk performance. Since virtually all of your files get moved during this
process, the chances are high that any leftover data from deleted
files will be wiped. But, there's no guarantee here. If
there's not much fragmentation on your hard disk, the defrag
program may not move enough files around to make a difference.
The best way to make sure files are permanently wiped is to use a
program specifically designed for wiping disk free space.
Disk-How does Internet History Eraser wipe disk?
Internet History Eraser wipes disk by overwriting free
space on disk with blank characters, it wipes the on-disk content of
"previous deleted file", this makes the data unrecoverable
and defeats the recovery software.
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