since CD-ROM and Compact Flash share a common interface, perhaps this can also be done for Compact Flash drives. then a portable version could be made.
the trouble of utilizing flash memory is that you may have to convert it to wav files first but i think this is very much doable. it will also provides a convenience to user since most of us does not prefer CD as media over flash memories.
This would be a very nice innovation.
of course the popular flash drive would be used in this case in which we will be opt to use a usb interface. hehehe
and eventually this will look like an audio player in the market that have a usb interface for MP3s. heheheh (i first saw this on a sony component)