500GB Seagate drive in an external FW enclosure won't mount

Hi-
I have the latest MacPro with one internal HD 250 GB. I found a great deal on a an ATA drive by Seagate 500GB and bought an external FW enclosure, as I've done many times in the past with smaller drives 160GB, 40GB and so on.
I connected everything and it won't mount. This case says it will handle larger drive sizes. I swapped an older drive from another case and it worked fine. Is there a step I'm missing, or do I have a bad drive?
I'm want to use the 500Gb for FCE editing.
Thanks,
Anne Z

Unfortunately, all cases are not made equal. Depending on the chipset used in the external case, it may not be compatible with your 500GB drive. Some chipsets can not handle that big of a drive. I have one firewire drive that can't handle a 250GB drive, but it can a 200GB drive. This seems to be your case since you are able to put a smaller drive in the case and it works. You might want to see if you can return the case and find one that specifically states it can handle a 500GB drive.
Glor

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