Deleting from USB does not free up space

Are you emptying the Trash after you remove the item from the flash drive?

No this question was NOT answered. This problem drove me crazy until I figured out the answer. I had 2 USB flash drives and they were both behaving as described above. The 2 Gb model would only hold about 128mb of photos before it would report "not enough free space" to copy any more. I tried everything. Reformatting with MS-DOS, FAT 16, emptying the trash, repartitioning. Nothing worked until I plugged one of them into a real windoze box and formatted it with Fat-32 (win32s). Now I can copy all the files and use all the space. It is very slow, however. Thanks Apple, for finally getting to the bottom of this.

Thanks. I got this far, too. I emptied the trash and the 'get info' for a SanDisk USB flash drive shows that it is empty (249.7 MB available). When I tried to load 103 photos all at once I get the "not enough space" message. When I load the files in increments of 5-10 files it works up to a point and then I get the "not enough free space" message, when I try to load one more file. This is after I've loaded about 103 MB onto the drive. Yet, when I 'get info' on the flash drive it shows plenty of space still available.

I have even checked the USB flash drive on a windows machine as well and it also indicates the same amount of free space.

Any suggestions?