Storage

Ripping your CDs to your hard disk requires some space
This table gives you an impression of the number of CDs you can store on a HD given the file format.

Audio Format	Setting	320 GB	500 GB	750 GB	1000 GB
RAW (AIFF/WAVE)	No compression	530	821	1,233	1,644
FLAC	Lossless compression	920	1,448	2,176	2,900
MP3	128kbit/s 160kbit/s 192kbit/s 320kbit/s	5,780 4,620 3,850 2,310	9,048 7,238 6,032 3,619	13,599 10,879 9,066 5,439	18,130 14,500 12,090 7,250

Note: Calculations are based on the data volume of a 60-minute audio CD. The actual CD capacity might vary depending on the length of each CD.
Source: http://www.olive.us/products/storagecalculator.html

Another calculator can be found here: http://www.pinnacleaudio.co.uk/products/storage_calculator.html