I noticed a weird problem that just appeard. Was burning a movie with DVD Decrypter, TDK002 @ 12x, NEC ND-3500A 2C8_SE_Ritek_4X_DL (because this is the firmware that gives me best results on TDK002)
The burn started out at 6x as it should be but I immediately noticed that the device buffer was empty. The buffer (program's buffer) was showing full. At about 40% of the burn the program's buffer suddenly emptied, burn slowed down and the device buffer came alive, filled to 100% and then the program buffer also filled up to 100%. After that I had a normal burn with minor fluctuations with both driver and program buffer, but the speed was limited, ranging from 5x-11x.
I rebooted the computer and tried again on my last TDK002 media, same thing. As I had no TDK002 media left, nothing was stopping me from upgrading the firmware so I loaded 2TD to the drive, rebooted and hoped that the problem would have gone away, but no.
Burning a movie on RICOHJPNR02 @ 16x, NEC ND-3500A 2TD was the same as before, burn starts out at 6x with an empty device buffer, later on the program buffer empties and the drive buffer kicks in. Screenshots and log from the RICOHJPNR02 burn below.
I am positive that the drive runs in UDMA2-mode as transfer rate test and data verification reaches up to 16x, so it's not the hard drive limiting the speed either.
I 00:07:56 DVD Decrypter Version 126.96.36.199 started!
I 00:07:56 Initialising SPTI...
I 00:07:56 Searching for SCSI / ATAPI devices...
I 00:07:56 Found 1 CD-RW, 3 DVD-ROMs and 1 DVDÂ±RW!
I 00:09:09 Operation Started!
I 00:09:09 Source File: C:\....img
I 00:09:09 Source File Sectors: 2*272*346 (MODE1/2048)
I 00:09:09 Source File Size: 4*653*764*608 bytes
I 00:09:09 Source File Application Identifier: NERO BURNING ROM
I 00:09:09 Source File Implementation Identifier: AHEAD Nero
I 00:09:09 Destination Device: [1:0:0] _NEC DVD_RW ND-3500AG 2.TD (H:) (ATA)
I 00:09:09 Destination Media Type: DVD+R (Disc ID: RICOHJPN-R02-03) (Speeds: 2,4x; 4x; 6x; 8x; 12x; 16x)
I 00:09:09 Destination Media Sectors: 2*295*104
I 00:09:09 Write Mode: DVD
I 00:09:09 Write Type: SAO
I 00:09:09 Write Speed: 16x
I 00:09:09 Link Size: Auto
I 00:09:09 Test Mode: No
I 00:09:09 BURN-Proof: Enabled
I 00:09:10 Filling Buffer...
I 00:09:13 Writing LeadIn...
I 00:09:35 Writing Image...
I 00:16:39 Synchronising Cache...
I 00:16:40 Closing Track...
I 00:16:51 Finalising Disc...
I 00:17:05 Operation Successfully Completed! - Duration: 00:07:55
I 00:17:05 [B]Average Write Rate: 10 743 KB/s (7.8x) - Maximum Write Rate: 15 048 KB/s (10.9x)[/B]
I 00:17:05 Cycling Tray before Verify...
I 00:17:21 Operation Started!
I 00:17:21 Source Device: [1:0:0] _NEC DVD_RW ND-3500AG 2.TD (H:) (ATA)
I 00:17:21 Source Media Type: DVD+R (Disc ID: RICOHJPN-R02-03) (Speeds: 2,4x; 4x; 6x; 8x; 12x; 16x)
I 00:17:21 Verifying Sectors...
I 00:22:23 Operation Successfully Completed! - Duration: 00:05:02
I 00:22:23 [B]Average Verify Rate: 15 048 KB/s (10.9x) - Maximum Verify Rate: 21 781 KB/s (15.7x)[/B]
Transfer read test:
The graph is not good but that might depend on the lousy burn, I have gotten better results at 16x with this media.