Apple Performa 6400/180 - Manual (Page 86)

Troubleshooting Symptom Charts/CD-ROM Drive - 12
CD-ROM Drive
CD-ROM drive does
not accept disc
1 If compact disc is dirty or damaged, use known-good compact
disc.
2 Replace CD-ROM drive.
Volume control does
not operate correctly
when playing Audio
CD, but does work
when playing system
sounds.
Check Sound control panel setting.
Spinning disc causes
vibration sounds in
12x CD-ROM drive.
The 12x CD-ROM drive reads CD-ROM discs very quickly, and
because of the drive’s high rotation speed, unexpected vibration
sounds may occur. This sound is normal for a 12-speed (12x)
CD-ROM drive.