Originally Posted by redlemon

That would make a great online calculator; I wonder if there is one? Anyway, the lossless codecs are all variable bit rate (VBR), but I think that they average 700-800 kbps*. A CD is recorded at 1411 kbps constant bit rate (CBR). Lossy codecs usually are done between 128 and 320 kbps. The average CD is, I dunno, maybe 45 minutes? Get our your calculators...

* This is a WAG (wild-ass guess). Someone else can probably correct me.

EDIT: Just did the math. Assuming I am right about the 45 minutes and 800 kbps, you would need about 135 GB. So that's really not out of line. Remember, 8 bits in a byte!