A couple of questions re. a used iMac DV 400 my wife just picked up.

1) we had a never used Microtech USB-SCSI adapter lying around that, 
on a whim, used to connect a Waitec 8x24x CD-R and an external SCSI 
Zip to the iMac (using the latest Microtech drivers, from 2001 IIRC), 
on the OS 9.1 partition.

I was happily surprised to find that the two peripherals were 
recognized correctly under Apple System Profiler, that Toast 5.1.3 
recognized the Waitec CD-R (and burned at 4x, which is the max. for 
USB).

I say "surprised" because I'd read several online reports that the 
Microtech didn't work right, didn't work well with ZIP drives, etc. 
But it seems to work just fine.

My question: can you hot-swap SCSI peripherals using the Microtech 
(i.e., as in USB devices), or do you risk the usual problems 
associated with hot-swapping SCSI devices (e.g. frying the logic 
board! etc.)?


2) said used iMac often emits a low, refrigerator-like hum when 
active (i.e. not in Sleep).

Is this a sign of impending HD or other trouble?
If HD, swapping in a new drive doesn't look too hard, and we're 
thinking of getting a bigger HD anyway. e.g. 40GB ATA/133 7200rpm 
Maxtor (any recommendations?)

Or could the hum be something more serious? (as in power supply or 
logic board related?)


Thanks for any help.

Chris

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