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Re: [OM] OT SCSI - was Scanner SCSI problem

Subject: Re: [OM] OT SCSI - was Scanner SCSI problem
From: Mark Marr-Lyon <markml@xxxxxxxxxxxxx>
Date: Thu, 7 Mar 2002 19:53:26 -0700
There's a big difference between just turning a SCSI device on that is 
already on the chain, and unplugging and plugging in SCSI devices with 
power on.  Toggling the power on an already connected SCSI device may or 
may not screw things up - I've seen both cases.  When it doesn't work it 
usually locks up the computer.  It also might not be symmetric; turning a 
device on may cause no problems, but if you turn it off, it locks up.

Unless you like buying new devices and/or computers, do NOT 
connect/disconnect a SCSI device to/from the chain with the computer 
powered up!  It can fry the SCSI controller on the computer, or the 
device itself, so is generally considered a Bad Thing.  There are 
hot-swappable SCSI controllers for servers and the like, where it is 
essential to swap out a hard drive without bringing the system down, but 
these are not usually found on normal desktop machines.

That's the nice thing about USB and FireWire, since you can plug and 
unplug at will.  And really, USB isn't all THAT slow - it is faster than 
normal ethernet, and works pretty well on my Minolta Scan Dual II with my 
Rev A iMac, running Classic on top of OSX :)

With all that said, I don't really mind SCSI either.  I've got a Unix box 
with with 6 devices on it, and once you figure out to get things in the 
right order, it works very well.

Mark Marr-Lyon

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