when you say HDD do you mean the hard drive in the audio system?
depending on what year it is, it either came with an RNS510, or optioned with one. That has a 30GB had internally. check out the audio section for custom firmware if youre into that stuff.
you install MP3s onto it via the SD card slot
also, if you have the MDI, you can option it with a USB port and plug in a hard drive there too
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