Thanks for your reply, John. The most recent CD burning errors are with drive G.
I have also noticed that my CPU is pegged at 100% (and the mouse is slow) while MC is burning.
Media Center Registered 10.0.92 -- C:\Program Files\J River\Media Center\
Microsoft Windows XP Workstation 5.1 Service Pack 1 (Build 2600)
AMD Athlon 1332 MHz MMX / Memory: Total - 523 MB, Free - 288 MB
Internet Explorer: 6.0.2800.1106 / ComCtl32.dll: 5.82 (xpsp1.020828-1920) / Shlwapi.dll: 6.00.2800.1400 / Shell32.dll: 6.00.2800.1233 (xpsp2.030604-1804) / wnaspi32.dll: 4.57 (1008) , ASPI for Win32 (95/NT) DLL, Copyright © 1989-1997 Adaptec, Inc. / Aspi32.sys: 4.57 (1008)
Ripping / Drive F: Mode:Normal Type:Auto Speed:Max
Drive G: Mode:Normal Type:Auto Speed:Max
Digital playback: Yes / Use YADB: Yes / Get cover art: Yes / Calc replay gain: Yes / Copy volume: 32767
Eject after ripping: Yes / Play sound after ripping: No
Burning / Drive F: PIONEER DVD-RW DVR-104 Addr: 1:0:0 Speed:8 MaxSpeed:8 BurnProof:Yes
Drive G: SAMSUNG CD-R/RW SW-252B Addr: 1:1:0 Speed:48 MaxSpeed:273 BurnProof:Yes
Test mode: Yes / Eject after writing: Yes / Direct decoding: Yes / Write CD-Text: Yes
Use playback settings: No / Normalization: None