I have a few ideas, though I don't know if they are accurate or not. I'm guessing that when you switched the BIOS settings after formatting, you corrupted the format information on the drive, hence ...

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A 80GB Samsung HDD has been added to a Pentium-3 era Dell to replace the old IBM Deathstar which died (whilst clicking of course). Now, the BIOS sees all 80GB of the HDD with settings on AUTO. However ...