Logic Pro X found audio files in 8 bit format

It seems indeed that the problem was due to the audio files being stored on a FAT32 drive. After moving them to an HFS one, the problem no longer occurred. I haven't been able to recover the corrupted files, though (e.g. using raw format import & changing file header).

This is truly irritating, since you would think that once you stop recording a take, any DAW should leave the recorderd audio files alone and (unless you deliberately utilize any destructive editing) perform read out operations at best. Contrary to that, Logic actually seems to change data in the files upon project shutdown. I can't think of any logic behind this (talk about logic in Logic, what a pun), let alone why this should lead to (randomly!!) corrupted files on FAT32 drives after re-opeing the project.

I've recorde to external drives dozens of times with Logic and no problem whatsoever, but I'm not exactly positive that they were all HFS. Following the reasoning above, they must have been...?!

Anyway - to be safe, no more recording to FAT32 for me.

One complete day of a paid recording session gone to h*e*l*l, with an appropriate damage to my personal reputation...
Whoever may be responsible for this, THANK YOU VERY MUCH.

@Rainburst: Using Logic 10.2.4

PS. Interesting censorship detail: I previously wrote the word *h*e*l*l* (without these asterisks) in this post, and after posting, some algorithm obviously censored the word, leaving it as all asterisks... - come on Apple, that's ridiculous, it's not even a cuss word.