Unable to format the 1TB iomega USB drive

I just bought a 1TB Iomega USB Desktop hard drive, but once I tried to reformat the drive, it's only showing 1x 500GB drive instead of 1TB. I am not sure if there is a malfunctioned hard drive or there is a way to fix it in the disk utilities. Please help!
Thanks.
I am using intel mac mini, OS 10.4.11.

Hi,
from waht I know the 1TB drive consist physically of two 500GB harddisks.
So it sounds as if you have either only formated one of the drives or the 1TB drive is set to the 'Mirroring' modus in which the two HDs inside act like a mirror of one to the other, which results in the capacity being cut to 500GB.
Have a look inside the Iomega manual to determine how to use it with your Mac for full capacity of 1TB.
regards
Stefan

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