This is a bus problem, not a storage problem.
It COULD be related to bad drive HW, but it also could be bad signal or power connection, or insufficient / bad power. The least likely of those problems, I believe, is the drive itself. Also, compared to the slimmer chance that it's a drive's onboard controller, it's at least as likely to be RAID or drive controller or expander cards.
That said, people seem to want to believe it's the drive since the count appears in a drive's smart output. In my experience it's far more likely to be flaky or insufficient power, or drive controller / expander. For example, at-home NAS setups frequently don't adequately cool the controller and expander cards. Until I put large fans literally ON EVERY controller and expander, I had flaky data problems all over the place.
Also, it's a good idea to have an extra power supply on hand for debugging possible power issues. It doesn't have to be big - you can power a drive by itself, on its own power supply, for testing.
And especially for ppl experiencing these same "UDMA CRC Error Count" problems on multiple drives, it's almost certainly not your drives.
