Originally Posted by goumba
Just curious, how big are the videos and what FS on the drive? I have seen this copying files larger than 4GB to a FAT based drive.
that was my first idea, too, but I think this produces a different error condition. "Not enough space" or something like that, IIRC.
However, I occasionally had this effect too - a USB drive (a normal HDD) that mounted fine, I copied a large amount of data to it, and in mid-copy the process stalled and complained about the target being read-only.
I investigeted that, and found out that from time to time the USB device disconnected and reconnected again after fractions of a second. That disconnection was so short that it wasn't even reported by the desktop, but since it happened during a write access, it left file system errors and therefore the file system was re-mounted read-only.
I finally found out that the reason was a bad USB plug that would lose contact from time to time when the cable was moved.
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