I've just downloaded 8.4 on my iPod touch 5 and almost all of the memory seems to be taken up with "other".
Almost all of my music is now unavailable as 18.5 GB is now taken up with "other". It all fitted on before the update.
It normally holds 32GB.
Well done apple.
iPod touch, iOS 8.4
An "other" larger than about 1 1/2 GB indicates corrupted files.
What is the Other on my iPhone and How to Remove It
What is "Other" and What Can I Do About It?
Next, usually restoring from backup eliminated the corrupted files. However, sometimes restoring to factory settings/new iPod is required.
To restore from backup see:
To restore to factory settings/new iPod see:
problem with iOS 8.4 on my iPod 5
