The 1693 produces an excellent burn for the first three or four rewrites and then disaster strikes. I’m not sure if it’s the drive or the media, although I strongly suspect it’s the media.
I use the 1693 only for backing up hard drive data. The dvd+rw backup disks are rotated and I note the backup date and check each backup disk with a Kprobe scan, which I store along with the backup records. I was very surprised to see the dvd+rw disks failing after so few rewrites.
You can see the difference between the first burn and the fourth in the Kprobe scans below. The data on the fourth rewrite had fatal errors and the disk was no longer usable.
If you’re getting around 10 rewrites per disk with the NEC, then I’m beginning to suspect the problem may be with the 1693. The other day I flashed the drive to the KS0B firmware. Maybe that was an issue.
OTOH, I’ve started to use Mitsumi 4x dvd+rw disks and one of them has survived with PIE errors peaking from 20 to 50 on the sixth rewrite. A Kprobe scan of that Mitsumi dvd+rw disk is the third scan below.
IIRC, you also have a 1693, or used to. I’d be interested to see a Kprobe scan of one of the Ritek 4x dvd+rw disks you have burned on your 1693.