EXP Computer PD-630 - Manual (Page 18)

POWER SAVING
The PD TRAVELER may operate with an AC adapter or batteries. Use of
the supplied AC Adapter will provide the power for use as a portable CD
player, or to extend the computer’s battery life.
The PD TRAVELER drive will automatically enter the sleep mode (spindle
off) when it has not been accessed for about 5 minutes. Also, you can
manually get to the sleep mode by removing the Compact Disc (CD) from
your CD-ROM drive. The operating current will then be reduced to 120 mA.
NOTE:
DO NOT disconnect the PCMCIA card from your CD-ROM drive while the
computer power is ON.