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- Newsgroups: comp.unix.questions
- Path: sparky!uunet!haven.umd.edu!decuac!pa.dec.com!nntpd2.cxo.dec.com!nabeth!alan
- From: alan@nabeth.enet.dec.com (Alan Rollow - Alan's Home for Wayward Tumbleweeds.)
- Subject: Re: Wiping disks
- Message-ID: <1992Nov23.232027.5865@nntpd2.cxo.dec.com>
- Keywords: wipe clear sanitize sanitization
- Lines: 41
- Sender: alan@nabeth (Alan Rollow - Alan's Home for Wayward Tumbleweeds.)
- Reply-To: alan@nabeth.enet.dec.com (Alan Rollow - Alan's Home for Wayward Tumbleweeds.)
- Organization: Digital Equipment Corporation
- References: <1992Nov20.164922.22203@newshost.lanl.gov>
- Date: Mon, 23 Nov 1992 23:20:27 GMT
-
-
- In article <1992Nov20.164922.22203@newshost.lanl.gov>, richards@beta.lanl.gov (William C. Richards) writes:
- >
- >I work for a US government contractor where the contracting agency requires
- >the wiping, clearing, sanitization (what ever you want to call it) of disks
- >which contain or may contain sensitive information. Is there any utility,
- >shell script, or SW package which would accomplish this?
- >
- It depends on the "clean" the disk has to be. I'm lead to believe that
- for modern hard disks there's still enough information left after multiple
- passes of simple minded erasing program, that the determined spook can
- still recover some interesting data. There are situations where physical
- destruction of the media is the only really secure way of destroying the
- data.
-
- Once you're able to determine the extent to which the data must be
- erased some utilities to consider are:
-
- 1. yes(1) and in general any program that writes a selectable data
- pattern to a file.
- 2. The program that formats the drive.
- 3. A custom program.
-
- One of the problems that you'll face for nearly any program is
- that some drives do bad block replacement. Once a "bad" block
- is replaced you don't have access to the original. And while the
- original may have a few problems, it doesn't mean that all of the
- data is irretivably lost. Some of it may look "funny" and some of
- it will be fine.
-
- The formatting program may take care of these blocks but you come back
- to the problem of how hard it would be for the determined spook
- to recover something interesting.
-
- >Many thanks in advance for you help.
- >
- >Peter Richards
- >
- --
- Alan Rollow alan@nabeth.cxo.dec.com
-
-