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I suggest looking for another drive, such as a CDRW/DVD.
Get the T20/T21/T22/T23 manual from the HMM link at the top of this page, it has the P/N or FRU for those parts.
Alternative: get a PCMCIA USB2.0-card and a more modern external USB-drive.
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I'm further going to assume that you are indeed using a DVD-ROM drive and not a CD or CDRW drive, inside a T22. If that's the case, some of the oldest DVD-ROM drives can have problems reliably reading CD-R and CD-RW disks. So if your bootable disk(s) are on R or RW media, about the only thing you can do is replace the DVD-ROM drive with something "newer" as RealBlackStuff indicated.
You can replace the drive with one from the Hardware Maintenance Manual (HMM). That is, use a genuine IBM part that is a CDRW drive. I would avoid replacing your drive with a plain old CD drive; they can have the same problems with reading R/RW disks. Or you can "upgrade" to something that is NOT in the HMM by using aftermarket drives and performing a little bit of surgery. If you're interested in that route we can discuss it further here.
X22 X24 X31 X41 X41T X60 X60s X61 X61s X200 X200s X300 X301 Z60m Z61t Z61p 560 560Z 600 600E 600X T21 T22 T23 T41 T60p T410 T420 T520 W500 W520 R50 A21p A22p A31 A31p
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Yes, I did some typos speaking of what I just quoted about the grammar mistakes you were trying to point out, and I edited my forum post too recently.I'm going to make an assumption that when you wrote you are having problems detecting "bootable CD drives" you actually mean bootable DISKS. And that you have properly configured BIOS to place the optical drive first in the boot order.
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