Drives Burn, but won't read newly burned disk

I've got two sony super drives, they are burning seemingly ok, but when I eject the disk and put it back in the computer tells me I've inserted a blank disk.
I can see the data burned into the disk, so I know there's something on the disk, but what's going on with my drives? It's both drives, so that leads me to believe that it's a software issue, not a bad drive.

I have posted on another section, but here are my comments repeated.
My dual disk drive fails to read some of my backup DVDs, which is a irritating. I have used a DVD cleaner, by the way. They were burnt on the machine originally and have been read in the past by both drives. I fitted 2 drives for just this sort of eventuality – and to do 2 backups at the same time, so I don't believe it is drive failure. I can restart the machine and occasionally they will read, but often not. I reduced the speed of burn from x16 down to x12 to see if it made a difference, but that is fairly inconcusive. The disks are stored 2-up in individual crystal cases, so scratching from sleeves shouldn't be a problem.
The disks fortunately CAN be read on my wife's old iMac, so I can network the data across.
Interestingly, some of the DVDs used are unbranded (plain white for printing), but some are 'Imation' brand. I would note that 'Tesco' (supermarket brand) DVD+R disks appear to be satisfactory at recalling data, for the time being.
The conclusion I draw is that it is down to the quality of the disks that are used. Don't necessarily go for bargain spindles of unbranded disks for valuable backups, although I cannot definitely say that branded ('Imation' in my case) disks will guarantee your backup security.
Judging by the lack of input on this message board on this subject, this may not be a widespread problem, but I would be interested to know if there is a definitive fix out there or if anyone can comment.
MacPro Mac OS X (10.4.11)

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