Formatting usb-sticks on iMac - Snow Leopard

I have two USB-sticks, which I used several times, all files have been deleted.
Nevertheless they show as being nearly full, so I cannot save anything else on them. Is there a possibility to format these sticks, so that the space is available again? Or do I just have to through them away?
An answer (if possible step-by-step) would be very much appreciated.
An amateur from Vienna

Hi and welcome to Discussions,
when deleting files from an USB-Stcick you should not forget to empty the trash afterwards and before disconnecting the stick.
Otherwise the files you deleted are still eating up the space on the stick.
For formatting an USB-stick you can use Disk Utility (might be Festplatten-Dienstprogramm in Austria) to be found in the Applications/Utilities Folder.
In Disk Utility click on the USB-Stick in the left pane, then on the Format-Tab in the right pane.
Use the Disk Utility Help function if needed.
My I also suggest to have a look at these informations
http://www.apple.com/at/support/mac101/
http://www.apple.com/at/support/switch101/
http://www.apple.com/at/findouthow/mac/
Regards
Stefan
Message was edited by: Fortuny

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