I think the other commenter is right...you're thinking of DVD-R vs DVD+R, possibly even DVD-RW and DVD+RW.
Based on the specs listed, OP was in college just before me or may have overlapped. The big gold CD-R stacks (you could bur in jewel cases, on spindles, or just gross stacks which were nice and cheap) were a huge thing with my group (who encoded to FLAC & MP3 -V0 and burned audio CDs relentlessly. We felt we were archiving our liberal arts college music library and radio library for the future! Who knows. Some of that "future" is still backed up and on hard disks, and I should migrate them to SSD or tape just on principle.
At that point CD-R were cheaper than CD-RWs, and because most archiving/distributing didn't require rewriting (not return-on-investment wise anyway), we just shared programs on CD-R as well. In some ways it was a beautiful technology! Particularly fidelity to a spec everyone tried to bend and break for a profit angle, when honestly, there was no point for many of us using CD-R
Big difference.