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The BIOS is not autodetecting the CD-ROM drive when the system boots up
Explanation: Your BIOS supports detecting CD-ROM drives when it autodetects at boot time, but either consistently or intermittently does not detect your drive.
Diagnosis: Support for detecting CD-ROM drives in BIOSes can be rather spotty. Newer ones usually support this feature but older ones don't. I have also seen drives that are sometimes detected and sometimes not. Ironically, the BIOS doesn't really do anything when it autodetects a CD-ROM, unlike when it detects a hard disk. The CD-ROM is controlled entirely by the software driver. So in short, it doesn't really matter much if the CD-ROM is detected in the BIOS or not.
Recommendation: Don't worry about it.