Here is the diagnostic from one of my last failed burn attempts.
600)
Dell Computer Corporation Dimension 4600i
iTunes 7.1.1.5
CD Driver 2.0.6.1
CD Driver DLL 2.0.6.2
LowerFilters: PxHelp20 (2.0.0.0), drvmcdb (1.0.0.1), sscdbhk5 (1.0.0.1), MxlW2k (1.1.0.116),
UpperFilters: GEARAspiWDM (2.0.6.1),
Current user is not an administrator.
Video Display Information:
Intel(R) 82865G Graphics Controller
Connected Device Information:
DiskDrive, ST340014A
Could not open CD handler, 5. Problem with installation of drive in Windows or drive contains copy protected CD.
CDROM, SAMSUNG CD-R/RW SW-252S, Bus Type ATA, Bus Address [1,0]
CDROM, SAMSUNG DVD-ROM SD-616E, Bus Type ATA, Bus Address [0,0]
Some computers need an update to the ATA or IDE bus driver, or Intel chipset. If iTunes has problems recognizing CDs or hanging or crashing while importing or burning CDs, check the support site for the manufacturer of your computer or motherboard.
D: SAMSUNG DVD-ROM SD-616E, Rev F501
Drive is empty.
E: SAMSUNG CD-R/RW SW-252S, Rev R901
Audio CD in drive.
Found 13 songs on CD, playing time 51:22 on Audio CD.
Track 1, start time 00:02:00
Track 2, start time 04:38:36
Track 3, start time 08:55:36
Track 4, start time 12:31:40
Track 5, start time 16:32:61
Track 6, start time 20:45:09
Track 7, start time 23:40:63
Track 8, start time 27:19:42
Track 9, start time 31:40:65
Track 10, start time 35:31:06
Track 11, start time 39:15:74
Track 12, start time 42:56:03
Track 13, start time 46:51:28
Audio CD reading succeeded.
Get drive speed succeeded.
The drive CDR speeds are: 4 8 16 24 32 40 48.
The drive CDRW speeds are: 4.
Force Optical Power Calibration before burn is turned on in the preferences.
The last failed audio CD burn had error code 4251(0x0000109b). It happened on drive E: SAMSUNG CD-R/RW SW-252S on CDR media at speed 16X.