Disk test - Does it work or is one of my disks faulty?

Thanks.

I've thrown some more time at this and have determined both disks are failing but because they don't get much usage before the ReadyNAS is shut down for each evening the issues were masked.

I have performed a DIsk Test on 2 other ReadyNASes I own and they have all started correctly scanning. The 312 where the Disk Test fails shortly after issuing it now also has 1 drive that is showing a "Current Pending Sector Count" of 2.

Interesting that the drives appear healthy until a full disk test and that the WD firmware has a go-slow with no other errors triggered if the disks are starting to misbehave.. I suspect the raw throughput test worked as I only ran it on a bit of the drive.. and the Scrub worked (albeit slowly) because the WD isn't overly noisy with SMART logging.. It's only the Disk Test that shows up serious errors. I will make sure to keep my ReadyNASes more routinely disk tested now!

The disks are about 2 months out of the 3 year warranty (always the way isn't it)

I'll come back to update if the raw throughput recovers once my new drives arrive :)