Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!ucsd!usc!sdsu!crash!pnet01!jca
From: jca@pnet01.cts.com (John C. Archambeau)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Write protect for hard drive
Message-ID: <2935@crash.cts.com>
Date: 1 Jun 90 00:56:15 GMT
Sender: root@crash.cts.com
Organization: People-Net [pnet01], El Cajon CA
Lines: 25

georgen@gpu.utcs.utoronto.ca (G. Ng) writes:
>In article <1733@krafla.rhi.hi.is> frisk@rhi.hi.is (Fridrik Skulason) writes:
>>Forget about software solutions - they are not 100 % reliable.  There are
>>many programs out there that claim to be able to write-protect hard disks,
>>HDSENTRY is an example, but they just don't work.
>
>What is it about HDSentry that makes it not 100% reliable?  I've been using
>it on my PC and it works fine for me.  Do you mean that certain viruses or
>trojans are able to circumvent HDSentry's protection scheme?  Hmm...

The only way for it to get around HDSENTRY would be to restore the hard drive
write interrupt and the trojan/virus would have to be intelligent enough to
know that the interrupt has been bypassed.  Sorry, but I think such software
solutions do work, especially if they intercept interrupts.
 
     // JCA

 /*
 **--------------------------------------------------------------------------*
 ** Flames  : /dev/null                     | Small memory model only for
 ** ARPANET : crash!pnet01!jca@nosc.mil     | Unix?  Get the (*bleep*) out
 ** INTERNET: jca@pnet01.cts.com            | of here!
 ** UUCP    : {nosc ucsd hplabs!hd-sdd}!crash!pnet01!jca
 **--------------------------------------------------------------------------*
 */