I just cut and pasted a swathe of files from the Samsung S2 USB 2.0 1TB external hard drive to a PC internal drive and about a third of their contents have disappeared. The folders of the missing material have remained on the external drive and have been copied over to the internal drive, but on both sides the folders are empty or contain a tiny fraction of their contents - absolutely no sign of the moved material anywhere.
Any ideas please on how to recover the missing files?