Thanks for the suggestion. I was trying to get rid of these old 1-2x disc I have lying around. I usually use the RITEX, which is what I tried next and ...
Here is the log if anyone is interested:
I 14:22:18 Operation Started!
I 14:22:18 Source File: <REMOVED>
I 14:22:18 Source File Sectors: 2,268,741 (MODE1/2048)
I 14:22:18 Source File Size: 4,646,381,568 bytes
I 14:22:18 Source File Volume Identifier: <REMOVED>______________________
I 14:22:18 Source File Application Identifier: MKISOFS ISO 9660/HFS FILESYSTEM BUILDER & CDRECORD CD-R/DVD CREATOR © 1993 E.YOUNGDALE © 1997 J.PEARSON/J.SCHILLING
I 14:22:18 Source File Implementation Identifier: mkisofs
I 14:22:18 Source File File System(s): ISO9660, UDF (1.02)
I 14:22:18 Destination Device: [1:0:0] PLEXTOR DVDR PX-716AL 1.02 (H:) (ATA)
I 14:22:18 Destination Media Type: DVD-R (Disc ID: RITEKG05) (Speeds: 4x, 6x, 8x)
I 14:22:18 Destination Media Sectors: 2,298,496
I 14:22:18 Write Mode: DVD
I 14:22:18 Write Type: DAO
I 14:22:18 Write Speed: MAX
I 14:22:18 Link Size: Auto
I 14:22:18 Test Mode: No
I 14:22:18 BURN-Proof: Enabled
I 14:22:19 Filling Buffer...
I 14:22:20 Writing LeadIn...
I 14:23:10 Writing Image...
I 14:30:28 Synchronising Cache...
I 14:30:48 Image MD5: <REMOVED>
I 14:30:48 Operation Successfully Completed! - Duration: 00:08:29
I 14:30:48 Average Write Rate: 10,359 KB/s (7.5x) - Maximum Write Rate: 11,211 KB/s (8.1x)
I 14:30:50 Operation Started!
I 14:30:50 Source Device: [1:0:0] PLEXTOR DVDR PX-716AL 1.02 (H:) (ATA)
I 14:30:50 Source Media Type: DVD-R (Book Type: DVD-R) (Disc ID: RITEKG05) (Speeds: 4x, 6x)
I 14:30:50 Image File: <REMOVED>
I 14:30:50 Image File Sectors: 2,268,741 (MODE1/2048)
I 14:30:50 Image File Size: 4,646,381,568 bytes
I 14:30:50 Image File Volume Identifier: <REMOVED>______________________
I 14:30:50 Image File Application Identifier: MKISOFS ISO 9660/HFS FILESYSTEM BUILDER & CDRECORD CD-R/DVD CREATOR © 1993 E.YOUNGDALE © 1997 J.PEARSON/J.SCHILLING
I 14:30:50 Image File Implementation Identifier: mkisofs
I 14:30:50 Image File File System(s): ISO9660, UDF (1.02)
I 14:30:50 Verifying Sectors...
I 14:37:25 Device MD5: <REMOVED>
I 14:37:25 Image MD5: <REMOVED>
I 14:37:25 Operation Successfully Completed! - Duration: 00:06:34
I 14:37:25 Average Verify Rate: 11,516 KB/s (8.3x) - Maximum Verify Rate: 16,699 KB/s (12.1x)