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I have a Seagate Barracuda 500GB hard drive that the BIOS shows the size as being 0MB in compatibility mode, and 4.14GB in AHCI mode. My motherboard is an ASUS P7P55D-E PRO.

What is causing the disk's size to be wrong?

Is it possible my troubles are due to the BIOS not recognizing a disk this big? How do I find out the maximum disk size my BIOS will support?

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What model/make is your motherboard? – slhck May 2 '11 at 9:18
Updated the detail into the article up top – Everyone May 2 '11 at 10:20
Hmm, kind of surprising as it's a relatively new board. And the disk works in the OS? – slhck May 2 '11 at 10:27
nope. this is a new box i'm building; but i tried the disk on a neighbour's computer which also reported 0MB – Everyone May 2 '11 at 11:15
So are you able to install anything on it or not? – slhck May 2 '11 at 11:30

If the disk repeatedly clicks (might be rather quite), return it to the retailer. Its defective when it does not even know to report its size correcty to BIOS. This information is stored on the magnetic surface, so there must be a serious problem reading data - very bad for a hard disk.

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No clicking ... but it's almost a week now I've been stooging around this issue; might as well begin consider an RMA now )+: – Everyone May 2 '11 at 15:45

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