Re: Hard drives v. CF/Smart media/etc.

[Alloishus BeauMains <all0i5hu5 () gmail com>]

Yes, you are right crazy.....

Apples to oranges. With chip based (flash, or eeprom) or magnetic
medias file system doesn't really matter when it comes to saving data.
At the physical media level, USB Drives, CF, and SmartMedia cannot
save a 'ghost' image of data. If there is a program to retrive data,
it is because that data was copied to another location beforehand,
most likely the cache of the computer.

Magnetic media leaves behind an arrangement of electrons that can be
algorithmically rearranged back to get all of the original data in
some cases. Depending on if the drive was overwritten, or if the drive
had physical damages determines how much information can be retrieved.
Chip based media does not have that luxury, since the data is based on
a logical 0 or 1 connection.

Think of the magnetic media just like your cassette tapes that play
music. The "data" in that case is a series of wavelengths that are
saved to the magnetic strip of a cassette, and a head reads that
"data" and then sound is replicated.

Think of a chip based media as a board that has pins, and those pins
are either on, or off. Data is determined by which pins are off and
on. Once those pins are changed, no residue is left behind. There is
no rescrambling of the electrons to get the information back.

Chip media is closer to chip memory in a PC, while Hard drive media is
closer to tape drive, or floppy disk technology.

So based on that, back to the security side, chip media only needs to
be overwritten once in order to wipe everything that was on the disc
before it. Magnetic media needs to be overwritten more in order to get
rid of the 'ghost' image, and make sure that the 'ghost' image cannot
be replicated.

The physical media layer doesn't really care about the file
system....file systems are an OS thing.


On 10/20/05, crazy frog crazy frog <i.m.crazy.frog () gmail com> wrote:
> >         What if someone is using the NTFS file system?  How many time would one have to
> > overwrite the data before it became
> > unrecoverable?  Would say PGPs wipe function be more effective on flash media
> > then on an actual HD/floppy disk?
> some industy standard (not sure) it is 21 times.but diff standard has
> diff times to overwrite.so checkon google for more.although more u
> overwrite much better it is :)
>
> --
> bam bam
> ting ding ting ding ting ding
> ting ding ting ding ding
> i m crazy frog :)