Disk On Key Problem

[NoamC]

I'm not sure if this is the right forum to post about Disk on key, but i'm trying.

I have a problem with mine, which makes all the files invisible.
I connect the disk on key, open the folder but cannot see all the files I put it. When I try to add files, it tell me that it's full, and I can also see that on Properties, so they are still there but i cannot see them.
Anyone knows why its happening?

[LooseChippings]

Disk on Key?

What make / model hardware are you having a problem with?

Which Operating Syatem are you using?

[NoamC]

Disk on key, i mean that thing like the pic below:
Disk On Key
Oparting System - Win XP