Ahhhh - that is reassuring. I was fairly certain the drive I swapped out had issues, but then on seeing this in the logs I just thought the worst.

I will now complete the upload of the remaining 12000 tracks:-)

Thanks Mark.
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock