I've now re-imported the three discs via the Control:10 and they have appeared, as normal, without affecting the corrupted one. Apparently, the system does not recognise them as being the same as the corrupted one because the size and shape of the data is not the same, so the algorithm doesn't make a match.

I am left still needing to delete the corrupted file...

Has anybody else encountered anything like this before?

C10, Source One (broken), 1x TwinStore (2x4TB), various DACs, Musical Fidelity A5 pre/power amps into B&W speakers. F80 in bright shiny red.