Some install CD no longer readable by CD in Sierra 10.12.6

Some older install disks no longer readable by internal CD drive or external CD drive running Sierra 10.12.6. However, DVD disks do spin up and play. I suspect it may have something to do with the file system used in Sierra. Any ideas or suggestions would be helpful. Running iMac late 2009.

Model Name: iMac

Model Identifier: iMac10,1

Processor Name: Intel Core 2 Duo

Processor Speed: 3.06 GHz

Number of Processors: 1

Total Number of Cores: 2

L2 Cache: 3 MB

Memory: 16 GB

Bus Speed: 1.07 GHz

Boot ROM Version: IM101.00CF.B00

SMC Version (system): 1.52f9

OPTIARC DVD RW AD-5680H:

Firmware Revision: 3AHB

Interconnect: ATAPI

Burn Support: Yes (Apple Shipping Drive)

Cache: 2048 KB

Reads DVD: Yes

CD-Write: -R, -RW

DVD-Write: -R, -R DL, -RW, +R, +R DL, +RW

Write Strategies: CD-TAO, CD-SAO, CD-Raw, DVD-DAO

Media: To show the available burn speeds, insert a disc and choose File > Refresh Information

TSSTcorp CDDVDW SH-S223L:

Firmware Revision: SB02

Interconnect: USB

Burn Support: Yes (Generic Drive Support)

Profile Path: None

Cache: 2048 KB

Reads DVD: Yes

CD-Write: -R, -RW

DVD-Write: -R, -R DL, -RAM, -RW, +R, +R DL, +RW

Write Strategies: CD-TAO, CD-SAO, CD-Raw, DVD-DAO

Media: To show the available burn speeds, insert a disc and choose File > Refresh Information