BBOLT@vm.ucs.UAlberta.CA (Bob Bolt) (08/31/90)
Does anyone know is it is safe to connect and disconnect SCSI devices while the power on the computer and SCSI device is still on? I often have to add or remove hard drives and tape backup units to my system and it is annoying to have to reboot every time. I recently obtained the MountEm fkey and the docs imply that it is okay to plug a hard drive into the SCSI port with the computer running and then mount the drive. Is it safe to do this or are there potentially dire consequences like those listed for connecting ADB devices while the computer is on (which I have done for some time now without any problems :-/) Bob Bolt BBOLT@VM.UCS.UALBERTA.CA
paul@taniwha.UUCP (Paul Campbell) (09/02/90)
In article <989@vm.ucs.UAlberta.CA> BBOLT@vm.ucs.UAlberta.CA writes: >Does anyone know is it is safe to connect and disconnect SCSI devices while >the power on the computer and SCSI device is still on? I often have to add >or remove hard drives and tape backup units to my system and it is annoying >to have to reboot every time. I recently obtained the MountEm fkey and the >docs imply that it is okay to plug a hard drive into the SCSI port with >the computer running and then mount the drive. I always thought it was safe to do this, and in fact recabled SCSI disks live thousands of times until about 6 months ago when I fried the controller on one of my disks (an Apple Quantum 80 - luckily a friend had a dead Quantum that had died in the earthquake so I got my disk and data back). Be carefull out there Paul Campbell -- Paul Campbell UUCP: ..!mtxinu!taniwha!paul AppleLink: CAMPBELL.P What most people don't realize is that those plastic cover slips that your 3 inch floppies come in are actually condoms for protecting your computer from harmfull computer viruses - practice safe computing ..... :-)
joe@cbnews.att.com (Joseph Judge) (09/02/90)
*Never* connect/disconnect SCSI devices while the SCSI bus is live (== Mac and drives are turned on). I'm sure you'll get responses about this one! This is always what I heard and I heard that Apple says the same. I've never put it to the test, though. If you've got the money, try it :) (no, really, please don't) Joseph Judge joe@cblpf.att.com (Bob Bolt) writes: > Does anyone know is it is safe to connect and disconnect SCSI devices while > the power on the computer and SCSI device is still on? I often have to add > or remove hard drives and tape backup units to my system and it is annoying > to have to reboot every time. I recently obtained the MountEm fkey and the > docs imply that it is okay to plug a hard drive into the SCSI port with > the computer running and then mount the drive. >
anderson@Apple.COM (Clark Anderson) (09/03/90)
From: BBOLT@vm.ucs.UAlberta.CA (Bob Bolt): >Does anyone know is it is safe to connect and disconnect SCSI devices while >the power on the computer and SCSI device is still on? I often have to add >or remove hard drives and tape backup units to my system and it is annoying >to have to reboot every time. One of our SCSI gurus here says that he's "seen lots of SCSI controller boards fried" because the bus wasn't powered down when the user added/removed a device from the chain. Offhand, I'd say that the annoyance of shutting down would be nothing compared to having to buy a new drive... --clark -- ----------------------------------------------------------- Clark Anderson InterNet: anderson@apple.com PCB Software Tools AppleLink: C.ANDERSON Apple Computer, Inc BellNet: 408-974-4593 "I speak only for myself, much to my employer's relief..." -----------------------------------------------------------