Wondering whether large USB drive is being recognised.

Hello. I bought a new 500GB drive USB after dropping my 60GB drive and thinking it damaged. The new drive would not mount itself to the desktop when the computer is already on, only if it was on at start-up. After disconnecting the drive the Finder complains that a disc was not put away properly, and then shows a greyed-out icon of the drive.
Have also tried a known-working 400GB drive which also does not mount. Both are visible to Apple System Profiler but nothing else.
I've been round the houses a bit with this and my question is:
is there anything OS-wise that prevents the machine from seeing a drive the size of 400-500GB? (Even though advertised as suitable for OS9 etc).
Is there anything else that might be going on?
All help appreciated: quite apart from the cash involved in buying the drive, I feel exposed with no viable large back-up facilities!
Many thanks...
Beige G3 Mac OS 9.2.x

Hi, Bousque. With the large drive connected to the Powerbook running OS X, open Disk Utility and partition the big drive (using the Mac OS Extended format on each partition) so no partition is larger than about 190GB. Then test it again on your B&W G3 running OS 9.
Unfortunately, a drive connected to the B&W's built-in USB 1.1 ports will only operate at USB 1.1 speed: about 1/30-1/40 of FireWire speed, and 1/25-1/35 of real-life USB 2 speed. That is to say, data transfers between computer and drive will crawl along at a maximum of less than 1.5MB/second. If you're only reading and writing an occasional file to/from the external drive, that may be OK with you. But if you're backing up a large amount of data to it, expect the backup to take at least 11.5 minutes per gigabyte.

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However, when your anti-virus actually snaps to it, and removes the virus / trojan, and you go off on a virus-killing mission, galavanting through the registry and cleaning the little buggers out in Safe Mode and everything... you might remove the viral elements... but... the reference to them might still remain. The device manager is still looking for that "driver file", and will cause the optical drives to lock up in a Code 39 or Code 41 because of it.
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Wondering whether large USB drive is being recognised.

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