[AE CS5.5] Rendering error only .mov file

Good evening

Andfor a long timethat I wanted toputthis problem thatI was never ableto solve.
In mypc I have3 HDDs:
1 - Whatsystemof"C"
2 -DataStorage"E"
3 -DataStorage"F"

Well, whentheeffectofrenderinga mov file, indicatingthe path of "C" or "D" I have no problem, therendering iscompleted.

However, ifI pointa path like "F" or un'HDDexternalI get thefollowing error

Ido not understand whysomediscriminationHDD,is truly a mystery.

Any idea?

THANKS