...as my 10Gig HU became full I was dismayed. Then upon doing some research on what Windows Media Player can do I was happy to see that a WMA file is about 1/2 the size of an MP3 of the same quality...so I began deleting some stuff that I had ripped and managed to put twice as much music on. If I had a 60Gig I wouldn't have bothered as I dont beleive I would have filled it up. But in my car, which has considerable road noise, I find no noticable deterioration in listening quality with WMA files. Now that is all I use.