EXP Computer CD Traveler Series CD-620, CD-820, CD-1020, and CD-2020 with Portable CD-ROM card - Manual (Page 35)

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POWER SAVING
The PCMCIA CD-ROM is designed to save power.
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Built-in inactivity timer for about 40 seconds in stand-alone mode, the power
will be turned off automatically.
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when used with the computer, the drive will automatically enter the sleep mode
(spindle off) when it has not been accessed for about 1 minutes.
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if you remove the Compact Disc (CD) from your CD-ROM drive, the drive will
manually get into the sleep mode.
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when the PCMCIA CD-ROM is turned on, it will spin in a lower speed to save
power. The operating current will then be reduced.
The “Hot insert/remove” feature of a PCMCIA card helps to save power, too. If
Exchangeable Card Architecture (ExCA) compliant PCMCIA software has been
loaded on to your computer, then you can remove the PCMCIA CD-ROM after the
system has been booted, and insert it again when you need to use the CD-ROM
device. For notebook computer users, removing the card will preserve power and
prolong battery life.
Note: You are allowed to remove and insert the PCMCIA CD-ROM from the
computer at any time. But DO NOT remove the PCMCIA card from your
CD-ROM drive