Problems using USB memory sticks

Whenever i connect a memory stick with my macbook and try to delete a file off it, the file is moved to trash which is all well and good. But when i go to put anything back on it a message pops up saying that the memory is full.
Both times when i've encountered this problem i'd filled the memory stick with pictures and moved them onto a microsoft computer. Then i connected the memory stick back with my macbook and deleted all the photos from the stick by moving them to the trash can. When i go to put another load of pictures on it says its full. But there are no files on the stick!
Both times the USB memory stick can't be used, i've tried looking for any files on the microsoft computer but that can't find any or save anything to it.
Does anyone know anyway i can stop this problem and somehow get the memory stick to work again?

Hi
Try reformatting your memory stick using Applications/Utilities/Disk Utility. If you want to move files between OS X and Windows then you'll need to select FAT 32 format.
You may find you need to reformat the stick each time you copy a batch of photos from one machine to another.
Bob

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Message was edited by: realhiphop0331

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Message was edited by: roeiboot

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Sam,
Format your stick with MS-DOS (FAT32) format. I use camera CF cards as memory stick and a good practice is to regularly format them: it deals with defragmentation effectively.
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