I stumbled into the above folder in my Users folder with 50 sub-folders numbered F1-F50 each containing 7 files with the suffix .ithmb, presumably thumbnails of photographs on my iPhone. Is this folder a necessity?
Michael, its just a cache file, used to pre-set up file data so that the software responds faster, usually to our great delight. When things go wrong programmes like Onyx can delete these caches (after which the software will appear to run slowly first time out while new caches are established).
Those wonderful wind-up torches are useful when exploring the mysteries.
Michael Corgan 