However a bit of research has enearthed what it is for. Well two theories at least:
- LOST.DIR is like the recycle bin from windows. Android is a linux derivate so if you delete a file via Windows PC, and forgot to unmount the device, where such files get deleted, the LOST.DIR keeps em for recovery
- LOST.DIR is something mac/PC disk repair looks for and will ask about as part of it's repair process. If it's related at all to the standard lost+found, then it's a special file that holds all the corrupted or orphaned files found during a file system check.
- LOST.DIR this directory is simply for ANY deleted or 'lost' file for recovery purposes.
Now there you go