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- Xref: sparky comp.sys.dec:5884 comp.unix.ultrix:8232
- Path: sparky!uunet!ferkel.ucsb.edu!taco!rock!concert!rutgers!cmcl2!rlgsc.com!gezelter
- From: gezelter@rlgsc.com
- Newsgroups: comp.sys.dec,comp.unix.ultrix
- Subject: Re: Sanitize End Sectors?
- Message-ID: <1992Nov10.104715.246@rlgsc.com>
- Date: 10 Nov 92 15:47:15 GMT
- References: <1992Nov9.155043.4580@relay.nswc.navy.mil>
- Organization: Robert Gezelter Software Consultant, Flushing, NY
- Lines: 71
-
- In article <1992Nov9.155043.4580@relay.nswc.navy.mil>, wdence@nswc-wo.nswc.navy.mil (Walter Dence) writes:
- >
- > I need to send some files out. I need to wipe the ends of the
- > end-sectors with zeros (or circumflexes, or anything). This is
- > in case there is any sensitive info carried over into them from
- > a previous disk volume that had sensitive info.
- >
- > There was a similar flap several months ago over Prodigy.
- >
- > Is there a DCL batch file or other utility to do this?
- >
- > Is there a FAQ for this newsgroup?
- >
- > Is there an Internet FTP site for DEC-VAX stuff?
- >
- > Does "High-Water Marking" have anything to do with this?
- > If a disk volume is set to "Overwrite-on-delete", will this fix
- > this problem. Does the VAX environment have these features and are
- > they commonly used for this?
- >
- > Thanks,
- > Walt Dence
- >
- >
- >
- > =====================================================================
- > WALTER E. DENCE, JR.
- > Data Acquisition Specialist
- > Influence Mechanisms Branch, G95
- >
- > Commander, Dahlgren Division
- > Naval Surface Warfare Center Office: (301) 394-1707/1960
- > Dahlgren Division Detachment Fax: (301) 394-4510/4727
- > White Oak, G95 (W. Dence) DSN (AutoVoN): 290-1707/1960
- > 10901 New Hampshire Ave. MilNet: wdence@nswc-wo.nswc.navy.mil
- > Silver Spring, MD 20903-5000 Home: (301) 229-7394
- >
- > (This is personal opinion, not official opinion.)
- > =====================================================================
- --
- Walt,
-
- There have been many discussions in a variety of arenas. The
- exact answer depends upon who is doing the asking and who is
- doing the asking.
-
- There are, I believe, some programs in the DECUS library to zero
- blank disk packs completely. In any event, you probably want to
- do this BEFORE the volume is INITIALIZED, not after. Then you
- want to copy the files onto the now freshly scrubbed and initialized volume.
-
- The flap over Prodigy was a result of the fact that unlike memory
- contents on VMS, the contents of disk blocks are not, by default,
- zeroed before re-use on DOS (or VMS).
-
- You can use the /ERASE switch on DELETE operations to force VMS
- to do at least a simple erase on DELETE, but, if memory serves me
- correctly, the specially designed disk scrubbing programs are
- more thorough (and take significantly longer to run).
-
- I hope that the above has been helpful. If I can be of further
- assistance, please feel free to contact me by phone or Email.
-
- - Bob
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