Article View: comp.protocols.ibm
Article #1018Re: hard disk write protect
From: cs354- Broward Horne
Date: Wed, 22 May 1991 23:30
Date: Wed, 22 May 1991 23:30
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In article <9105201340.AA10238@lilac.berkeley.edu> BITNIC IBM-NETS List
<IBM-NETS%BITNIC.BITNET@lilac.berkeley.edu> writes:
>
>The reason I was asking without giving any specifics, is that before
>having to go out and getting documents to do the thing, I was wondering
>if there wasn't any system on which it would be easy to do without having
>to get the doc.
>
>For example, because I havn't taken the time to look it up, is there any
>standard on an IDE, SCSI or an AT type controller card for PC's? Does a
>MAC have any signal that's standard on it? Etc...
>
>OR... do I really have to do it on the schematic level of a Hard Disk,
>and there's no way to do it from the controller level?
>
>P.S. Once again, is there a list I can subscribe to that would be a bit
>more suited to this type of question?
A good place to try might be the Virus newsgroup ( comp.virus,
I believe ). I couldn't help but notice your system looks like it's
an Autocad lab or some such. I originally wanted to write-protect
the hard disks for our Acad lab, but it finally proved to be unfeasible.
For instance, how about temporary file saves? To do them to a temp
directory, or to a user's floppy disk, makes a WORLD of difference to
the users. Just takes too much time.
There should be a READ/WRITE line to the hard disk, if you can
get the schematic. Don't forget to tie the end still connected to
the drive to either a high or low, depending on which means READ/WRITE.
A lot of logic chips don't respect a hanging wire as being LOW.
--
Broward Horne Distant lands are not so far away,
horne@sapphire.idbsu.edu I don't know why *you* don't go.
an030@cleveland.freenet.cwru Take my hands, I'll show you the way.
Pack your bags, and.... sail away. :)
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<9105230728.AA28175@lilac.berkeley.edu>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!tut.cis.ohio-state.edu!ucbvax!sapphire.UUCP!horneShow Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!tut.cis.ohio-state.edu!ucbvax!sapphire.UUCP!horne From: horne@sapphire.UUCP (cs354- Broward Horne) Newsgroups: comp.protocols.ibm Subject: Re: hard disk write protect Message-ID: <9105230728.AA28175@lilac.berkeley.edu> Date: 22 May 91 23:30:37 GMT Sender: daemon@ucbvax.BERKELEY.EDU Reply-To: BITNIC IBM-NETS List <IBM-NETS%BITNIC.BITNET@lilac.berkeley.edu> Organization: The Internet Lines: 38