I don't see why not. If you can't have a 1TB drive installed, then your PC must be not old, but ancient. Same with installing two 250GB drives.

Thanks Sleepless

Forgive me - I'm not the most *au fait* with computers
My pc is far from being old.... but surely I don't have the 'capacity' to *deal with* a 1TB drive....?

I'm low on hard drive space - hence why I'm downloading to an external....
At present, I'm downloading to a 160GB external hard drive - with nowhere to back it up to.
The plan is to get two 250GB drives; download to one and back up to the other.
Will my hard drive be able to cope with two 250GB hard drives plugged in at the same time?

I'm not thick - there's just certain aspects of pc stuff I'm not that familiar with....