How do I find my external hard drive capacity?

I've just bought a Brand New Western Digital 1TB My Book Pro Hard Drive.
However, now that it's hooked up when I look at it 'Get Info' it tells me the following
Capacity 465.75 GB
Avaliable 421.57 GB
Used 44.18 GB
This doesn't look right to me - How can I verify the Hard Drive I've bought actually has 1TB of space?

Hi,
looks to me that the two HDs inside your 1TB are setup as a mirrored RAID, so that the actual size is 500GB (whic actual is 488GB).
Together with the drive you should have a CD where you can find some sort maintenance application.
Have a look inside the manual for the Drive at how to change it from a 'mirrored 500GB' to a 1GB Drive.
regards
Stefan

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