It was ExFAT

[churchofsmalldog]

Just want to update everyone that the problems here:

Copying file from windows PC to HD on vero results in network error

If the drive just has media files on it and you need to be able to plug the drive into a Windows computer as well, format it NTFS. NTFS is a little bit slower than EXT4 on Linux, but not enough that it would matter, certainly not for video playback.

and here:

Eternal buffering

After an hour or two of video playback, the next video I try to play will buffer forever. No further videos will play until the vero is rebooted. Music plays fine. The video files are an external harddrive, which is the same one i was using with OSMC on my raspberry Pi, which did not have this issue. I enabled logging and had it running when trying to play a video only to find that the log uploader addon is also broken. Any help greatly appreciated, thanks!

both appear to have been solved by reformatting the drive in NTFS. it took a long as time to do (3TB of data transferred both ways, ugh) but neither issue has appeared since. Just wanted to let everyone know.