Sony A-AY7-100-11(1) - Manual (Page 30)

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Notes on using RealJukebox
Caution
When you use the external CD-ROM (including docking-station)
While using RealJukebox software, do not connect/remove the
external CD-ROM drive. If you want to connect/remove the
CD-ROM drive, turn off your computer, then connect/remove the
drive. If you do not, serious malfunction may occur.