Burn process failed 0x03 Key_Medium_Error

Using Nero 6, stimulate burning is successful for data, ISO or ISO/UDF CD-R, but the burn process fails always in the beginning.

I enclose part of the log below. What's wrong?


16:41:47 #31 SPTI -1135 File SCSIPassThrough.cpp, Line 289
M: CdRom1: SCSIStatus(x02) WinError(0) NeroError(-1135)
Sense Key: 0x03 (KEY_MEDIUM_ERROR)
<snip>

16:41:47 #32 CDR -1135 File Writer.cpp, Line 311
Write error
M: DVD+RW RW5240

16:41:47 #33 Text 0 File ThreadedTransfer.cpp, Line 228
all writers idle, stopping conversion

16:41:47 #34 Text 0 File ThreadedTransfer.cpp, Line 222
conversion idle, stopping reader

16:41:47 #35 Phase 38 File dlgbrnst.cpp, Line 1685
Burn process failed at 12x (1 800 KB/s)