External Hard Drive Capacity.........

At the risk of committing heresy,here goes.

If I get a Creative Sound Labs MP-3 player,to use as an external hard drive,can I record 44.1,rebook standard on it,to use through a USB port or into a digital audio recorder to my two channel system?

If so,how many minutes(or hours) will fill 1GB of capacity?

I see on sale one that is 6gb and one that is 8gb,and I'm wondering how many cds(roughly) I could transfer to each one?

Thank you all.