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Started by Jean-Serge Gagnon
Mon, 20 May 1991 13:26
hard disk write protect
Author: Jean-Serge Gagnon
Date: Mon, 20 May 1991 13:26
Date: Mon, 20 May 1991 13:26
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Thanks Valdis... I am very much aware that the solution will vary from one system to the next, especially in the environment that I currently work. 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? Thanks again. _______________________________________________________________________ | | | Jean-Serge Gagnon <JSG8A@ACADVM1.UOTTAWA.CA> | |___________________________________ ___________________________________| | | | | Specialiste en Equipement | Computer Hardware | | Informatique | Maintenance Specialist | | Universite d'Ottawa | University of Ottawa | | (613) 564-7813 | (613) 564-7813 | |___________________________________|___________________________________|
Re: hard disk write protect
Author: 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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