Apple macbook, solidstate H/drive option or not.

While I haven't seen any conclusive evidence either way, the users of SSD appear to indicate that the lack of a moving spindle decreases internal noise which somehow improves the playback despite the presence of a buffer. Whether this is accurate or not I'm not sure but once I get my Intel SSD later this month I'll put it to the test against my WD 1TB Green Power RAID1 array.

You might be interested in reading this:

http://www.audioasylum.com/forums/pcaudio/messages/3/39967.html

Gordon Rankin recommends the SSD and has posted instructions on AA as to how to install one in a Mac Book.

Any good hard drive is pretty quiet these days - especially those designed for laptops. The average amp is going to generate more signal path noise than a spinning hard drive.

If you're worried about physical noise I suggest using a network storage device and stuffing it in a closet. You can get significantly bigger (and cheaper) space with that approach. I saw a 1 TB NAS drive for $220 the other day at Fry's electronics. At that price, buy two and use one as a backup.

We weren't referring to external noise.