I would suggest anything from 4x-12x as the burn speed on 16x discs. The 8x speed has been shown as safest on many discs, less potential for errors. Burn speed was not an error for years now for DVD, but the advent of 16x has changed that. Just how fast can you spin a disc and expect it to remain perfectly flat while it etches data into microscopic grooves?
Do not get obsessive over PI/PIE testing. It has its limitations, and is far less valuable than your typical cdfreaks member is willing to admit. PI/PIE should only be one test out of a battery of tests, to determine disc quality. The problem with PI/PIE testing is it largely depends on the drive itself, and it's not a solid scientific method, far too many variables, not enough constants. These tests are infamous for both their false positives and their false negatives.
Good media is, quite simply, media that burns consistently on most burners, and plays in most players, while producting low rate of coasters.
The only way to fully test a disc is by :
- running file comparison/verification (one that works, not that junk in Nero),
- about 2-3 disc scans (both PI/PIE type -and- the surface scans .... but be careful with the testing drives, drives can play a big part in this), maybe even in several different drives
- trying to extract an ISO with no read-back errors (or copy disc-to-disc, though this can be more faulty),
- and then by playing out the entire video front to back (or restoring all data files, if data).
If it can pass all of those, then the disc is fine.
Do not get OCD over one of the tests in one drive. Try another drive for that test, do other tests on your drive. If you cannot try the test in another drive, skip it. The other tests should give you good piece of mind, assuming they all pass okay.
However, for the most part, yes, Verbatim (MCC coded media) is going to be just fine. It has an extremely low coaster rate, only 0-5% of the time on average (meaning a 95-100% success rate overall!). In other words, at most in a 100 pack of discs, you could see 0-5 bad discs, on average.