Some files on my FAT32 partition were deleted. Since I didn't have any utilities that can undelete files from a FAT32 partition, I used a disk editor to restore the missing first characters of the files' names. This worked and they became visible again. After this I ran ScanDisk which told me it had found errors and offered to correct them by truncating the files. Stupidly I agreed and ScanDisk truncated all of my files to 4KB. How do I "untruncate" these files. I know the data is still there because I haven't written anything to the disk since, so why did ScanDisk want to truncate them in the first place?