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· I'm having trouble adding music to my library
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Import shenanigans (multiple 'I/O failures')
BT Smart Hub 2, Mac Mini running Roon with directly attached USB storage. Various endpoints running over wi-fi and wired via mesh network.
Affecting only one album - Berlioz Requiem etc., Leonard Bernstein, Sony Classical Royal Edition
Used CDs ripped today - just the one 2CD set - at first unsuccessfully (multiple inaccurate rips in dBPowerAmp with the internal CD drive on Dell desktop), so I’ve used a different drive on same PC (external USB BD/DVD/CD drive) and seems to have ripped accurately/perfectly.
Added the files to my Roon USB drive over the network (Samba share?) and Roon doesn’t like something about the files. I ripped as Apple Lossless and converted to WAV with same result - muliple tracks missing and showing as I/O Failure in folder view. (But different tracks missing depending on ALAC or WAV version).
Files are playing perfectly so far from the USB drive on the Mac over the network on Windows Media Player on the PC.
*MusicMaster is the dedicated USB storage connected to my Roon core and only contains my watched music folders.
The fact that I can play the files back faultlessly over the network suggests that I don’t have a network issue (i.e., the files haven’t been mangled over my Wi-Fi network) and this is my normal new music workflow which has pretty much worked flawlessly the last couple of years.
Sorry for the long post and multiple images.
I might have solved this quite by accident. I forced a rescan on my watched folder which seems to have done the trick - at least for the ‘primary’ ALAC version where all tracks are now visible.
(I use ALAC as it’s useful shorthand for ‘ripped from CD’, where everything else, FLAC, DSF, MP3, AAC etc. are from downloads.)
The WAV version is still broken, but I’ll leave it there for now to see if it corrects itself before I delete it. Might have to leave this one as a mysterious anomaly.
The cause might be that Roon is trying to import the files while they are still copying - you might try disabling the watched folder while copying, then enable. I’ve had a couple of similar ‘fails’ when I’ve been lazy… 
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