Why do my dvd burns fail to verify

Several attempts to burn dvds have resulted if failures to verify. It seems to burn fine, but will not verify and tells me the disk may be unreliable. I am using Delkin Devices Archival Gold DVD-R discs. Burned at both x6 and x8. The first 6 or so burned and verified fine, but the last 4 have not been verifyable. Any thoughts?

There could be several reasons:
iMac Superdrives are extremely finicky - mine only likes Verbatim for instance. So you might want to try a different brand; another way to get consistent good burns is to burn slowly - I set mine at the slowest speed available; I'd rather wait a few more minutes. I also do not do anything else during the burn process (and turn off screensaver/sleep). And, the drives are not sturdy desktop models, they get hot - so I would not burn more than two at most and then let it cool down for at least 15 - 20 minutes. For all of the above reasons, I usually use a desktop sturdy tray loaded burner which just works. But, even using the internal, I've never had a coaster.

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