I have a Cyrix MII 300, Windows 98 system with 128 MB of ram, 48X CDROM, and a Teac 512EB CDRW, which has been operating fine for 2+ months. I could burn from any source at the full 12X speed of the burner.
A couple of days ago, Adaptec Easy CD Creator would only let me burn at 4X directly from CD to CD, or from any other source (HDD, etc.). I had burned a CD at 12X the night before with no problems, All using the same media (IMATION 16X discs).
It now requires that I copy to the HDD first at any speed over 4X. Running the CD test in Adaptec reveals that the maximum extraction rate from the CD is 7X.
I installed a new Delta 50X CDROM in place of my Memorex 48X, but got the same results.
Teac tech support seems baffled at this point, saying it's not our problem. They suggested bad EIDE cable.
I have uninstalled and reinstalled the software and the CD drives in Device Manager but no change.