External harddrive not recognised

Hi.. im not sure if this is the correct forum, but i'll give it a shot. I have a hard drive I used in a windows pc. I recently bought a mac compatible external usb hdd casing and fitted the hard drive. But when I connect to my powerbook g4, it is not recognised by mac. Its shows up as connected in disk utility but its not mapped.... any help please????

Because USB isn't bootable, most people stick to Oxford 911+ which has FW400 and USB2 support.
You can find "Mac-compatible FireWire" for $38 on Amazon or just head to
http://www.macsales.com and see what is in the sales specials.
Also, you may want to remove the partition table while connected to PC, or try booting from Tiger DVD and wipe the drive.

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    thanks for your time.
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    see both screeshot. Only the usb stick appears. and see preferences also

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