They are on my sony experia st26i phone only.
Its purple and 8 mm long with very narrow green section before and narrow orange section after. Available memory 81.45 mb
Below the internal storage bar (green/purple/orange). All 3 take up only about 20% of the bar. It says total space 2.01GB
Below that it shows apps (green) 23.22MB
Then pictures/videos (purple) 371MB
Then audio (orange) 14.74MB
THEN AVAILABLE 212MB
Presumably the high pictures/video number is ***** of all these strange files?