Internal hard drive- can it be used as an external hard drive???

Well, this may be ranked right up there with dumb stupid questions but I have to ask. My sons both have iMacs- one has a new 80G internal hard drive. The other has the original one (600mhz iMac). I have the 20G internal one that was removed from iMac #1- is there any way that can be set up for iMac #2 as an external drive? I don't believe there is anything wrong with it and iMac#2 user would like to have more hard drive space...... Thanks for any help with this! Judy

mrstee,
Before I upgraded my iMac, I went looking for an external 3.5" enclosure. I went to BestBuy and then CompUSA. There are more choices at CompUSA, and yet, I left CompUSA empty handed because their choices were 1) clunky looking, 2) pricey, and 3) the specifications on the enclosures left me wondering about their (intended) compatibility with OS X.
I purchased my external 3.5" enclosure from CDW/MacWarehouse. It is a Macally PHR-100AF (strictly firewire) enclosure. They also have the PHR-100A (strictly USB 2.0), and PHR-100AC (USB 2.0 and Firewire 400). Mine was $48 + shipping. Macally shows these offered at CircuitCity, CostCo, and Fry's.
Positives: Aesthetic appearance. Simple transplant of internal drive to external enclosure without jumper change. Only two screws and ten minute task. Very fast and simple solution. Works perfectly with OS9 and OS X (10.4.3). Atractive price. Positive online reviews.
http://www.giantmike.com/reviews/macallyfirewire.html
http://www.coolmacintosh.com/phr100af35firewireenclosure111304.html
Negatives: None.
You can see these at http://www.macally.com
I have no financial interest in Macally.
Hope this helps.
/ckh

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