I just discovered a problem today with the LiteOn LH-20A1P and I have been investigating further with help from geno888 and Dee-27 who both have the same drive.
The preliminiary conclusion is, that the LiteOn LH-20A1P cannot perform a Full Erase on 4x DVD+RW media with KL0G firmware.
When a Full Erase is attempted with ImgBurn 126.96.36.199 the following errors are logged:
W 01:15:47 Potential 'WaitImmediateIO' Deferred Error - (0/4) - Session Fixation Error
E 01:15:51 Failed to Erase Disc - Session Fixation Error
E 01:15:51 Operation Failed! - Duration: 00:00:17
When a Full Erase is attempted with Nero CD-DVD Speed 188.8.131.52 the application simply hangs at 0% but no erasing is taking place.
What are the limitations of this problem?
Firmwares KL05 and KL0A don't seem to have this problem.
CD-RW, DVD-RW and DVD-RAM media don't seem to have this problem.
8x rated DVD+RW media don't seem to have this problem (three types tested).
What media types were tested and shown to exhibit this problem?
Verbatim 4x DVD+RW (MKM A02) has the problem (tested by DrageMester).
Philips 4x DVD+RW (PHILIPS 041) has the problem (tested by geno888).
Ricoh 4x DVD+RW (RICOHJPNW11) has this problem (tested by DrageMester).
The extent of our testing is not such that we can definitely say that the problem exists for all 4x DVD+RW media with KL0G firmware, nor can we definitely say that it doesn't exist with any other firmware for this drive or with any other media types.
Please post your experiences with performing Full Erase (not Quick Erase) with this family of drives (16A7S, 16W1P, 18A1P/H/S, 20A1P/H/S) and different firmware, so that we can find the extent of the problem.