A disk drive arrangement has a first disk drive such as a CD-ROM drive mounted below a second disk drive such a hard disk drive. The two drives share a single front panel which mounts controls and indicators related to both drives and may also include a disk access opening for at least one of the drives....http://www.google.es/patents/US5524104?utm_source=gb-gplus-sharePatente US5524104 - Compact disk drive arrangement with one disk mounted on top of another
Compact disk drive arrangement with one disk mounted on top of another