first of all, thank you for your support and apologies if this a silly question, but this evening i simply can't succeed in burning any dvd data (i tried at least 6 different dvds, but it didn't work. i've tried one cd and it worked fine as usual)

this is the log of latest error:

[ Info ]: Burning data CD/DVD/Blu-Ray/HD-DVD 00:14:10
[ Info ]: Selected device: 'TSSTcorpCD/DVDW SH-S182D' 00:14:10
[ Info ]: Requested burning speed: Fastest possible speed 00:14:10
[ Info ]: Testing unit ready... 00:14:10
[ Info ]: Unit ready 00:14:10
[ Info ]: Enabling Buffer Underrun Protection 00:14:10
[ Info ]: Device reported speed: 18.0x or 24930 KB/s 00:14:10
[ Info ]: Sending Optimum Power Calibration... 00:14:10
[ Info ]: Building ISO file system... 00:14:33
[ Info ]: Need to burn 2982 MB 00:14:33
[ Info ]: Starting burn in Track-At-Once mode 00:14:33
[ Info ]: Starting burn in Track-At-Once mode 00:26:50
*Error*: Burning disc error! 00:26:50
[ Info ]:
SCSI Status: 0x00, CDB Length: 10, CDB Dump: 0x2A 0x00 0x00 0x16 0x87 0x40 0x00 0x00 0x20 0x00 0x00 0x00 0x00 0x00 0x00 0x00

SCSI sense data dump:
Error Code: 0x71, Is Sense Valid: 潎, Segment Number: 0x00 (0)
Sense Key: 0x03, Reserved: 0x00, Incorrect Length: 潎
End Of Media: 潎, File Mark: 潎, Information: 0x00 0x00 0x00 0x00
Additional Sense Length: 0x0A (10)
Command Specific Information: 0x00 0x00 0x00 0x00

Additional Sense Code (ASC): 0x0C, Additional Sense Code Qualifier (ASCQ): 0x00


00:26:50
[ Info ]: Closing session 00:26:50
[ Info ]:
SCSI Status: 0x00, CDB Length: 10, CDB Dump: 0x5B 0x00 0x02 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00

SCSI sense data dump:
Error Code: 0x70, Is Sense Valid: 潎, Segment Number: 0x00 (0)
Sense Key: 0x02, Reserved: 0x00, Incorrect Length: 潎
End Of Media: 潎, File Mark: 潎, Information: 0x00 0x00 0x00 0x00
Additional Sense Length: 0x0A (10)
Command Specific Information: 0x00 0x00 0x00 0x00

Additional Sense Code (ASC): 0x3A, Additional Sense Code Qualifier (ASCQ): 0x02


00:26:50
[ Info ]: Eject 00:26:50

could you please help me to understand what has gone wrong?

thanks