Note: This only affects users who have a PowerBook 1400, are using Mac OS 7.6 or earlier, and have a 12x CD-ROM drive. You can tell what speed your CD-ROM drive is by taking it out of the PowerBook and reading the label near the back of it.
If you have a 12x CD-ROM drive in your PowerBook 1400, you will need Apple CD-ROM driver version 5.3.3 or later. System software versions 7.6.1 and later come with the appropriate software. If you have an earlier version of the CD-ROM driver software, the system will hang when trying to wake the CD-ROM from sleep.
Note: The CD-ROM drive goes to sleep when a CD is present but not accessed for about a minute.
These articles can help you locate the software update mentioned here:
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Where To Find Apple Software Updates" - Lists online services for free Apple software updates.
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Obtaining Apple Product Support in the USA" - Lists 800 numbers and online services for software updates, Apple support information, and a subset of the Apple Tech Info Library.