Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!samsung!uunet!uunet!pmafire!mica.inel.gov!sapphire!horne From: horne@sapphire.idbsu.edu (cs354- Broward Horne) Newsgroups: comp.protocols.ibm Subject: Re: hard disk write protect Message-ID: <1991May22.233037.27047@sapphire.idbsu.edu> Date: 22 May 91 23:30:37 GMT References: <9105201340.AA10238@lilac.berkeley.edu> Organization: Boise State University, Boise Lines: 37 In article <9105201340.AA10238@lilac.berkeley.edu> BITNIC IBM-NETS List 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. :)