There's newer firmware (DW10) available for your burner.
Thanks . . .
I found that the drive was operating in PIO mode, as the referenced post suggested. Deleted the driver and rebooted, and now it is set to DMA mde. Also, thanks for the info on the new firmware. Downloaded and installed that also.
Did a 'test mode' burn of the same file again, and operation seems to be back to normal. Here is the log of that burn:
I 09:54:30 ImgBurn Version 2.5.0.0 started!
I 09:54:30 Microsoft Windows XP Professional (5.1, Build 2600 : Service Pack 3)
I 09:54:30 Total Physical Memory: 2,061,284 KB - Available: 1,024,960 KB
W 09:54:30 Drive V:\ (FAT) might not support single files > 4 GB in size.
I 09:54:30 Initialising SPTI...
I 09:54:30 Searching for SCSI / ATAPI devices...
I 09:54:31 Found 1 DVD±RW/RAM!
I 09:55:44 Operation Started!
I 09:55:44 Source File: C:\Documents and Settings\Alex . . . .\Desktop\LC_PSCS4E3D.iso
I 09:55:44 Source File Sectors: 933,206 (MODE1/2048)
I 09:55:44 Source File Size: 1,911,205,888 bytes
I 09:55:44 Source File Volume Identifier: LCPSCS4E3D
I 09:55:44 Source File Application Identifier: Nero Burning ROM
I 09:55:44 Source File File System(s): ISO9660, Joliet
I 09:55:44 Destination Device: [0:1:0] TSSTcorp DVD+-RW TS-H653G DW10 (D:) (ATA)
I 09:55:44 Destination Media Type: DVD-R (Disc ID: SONY16D1) (Speeds: 4x, 6x, 8x, 12x, 16x)
I 09:55:44 Destination Media Sectors: 2,297,888
I 09:55:44 Write Mode: DVD
I 09:55:44 Write Type: DAO
I 09:55:44 Write Speed: MAX
I 09:55:44 Link Size: Auto
I 09:55:44 Lock Volume: Yes
I 09:55:44 Test Mode: Yes
I 09:55:44 OPC: No
I 09:55:44 BURN-Proof: Enabled
I 09:55:44 Filling Buffer... (40 MB)
I 09:55:45 Writing LeadIn...
I 09:56:03 Writing Session 1 of 1... (1 Track, LBA: 0 - 933205)
I 09:56:03 Writing Track 1 of 1... (MODE1/2048, LBA: 0 - 933205)
I 09:58:37 Synchronising Cache...
I 09:58:50 Cycling Tray after Test Write...
I 09:58:54 Exporting Graph Data...
I 09:58:54 Graph Data File: C:\Documents and Settings\Alex . . . .\Application Data\ImgBurn\Graph Data Files\TSSTcorp_DVD+-RW_TS-H653G_DW10_TUESDAY-MARCH-09-2010_9-55_AM_SONY16D1_MAX.ibg
I 09:58:54 Export Successfully Completed!
I 09:58:54 Operation Successfully Completed! - Duration: 00:03:09
I 09:58:54 Average Write Rate: 12,198 KB/s (8.8x) - Maximum Write Rate: 15,990 KB/s (11.5x)