[all variants] re-format USB stick with isofs install system?

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http://ubuntuforums.org – Hi - can anyone suggest how to proceed in this interesting situation? I wanted to try out the CrunchBang distro, so I downloaded it and put the install files onto an 2GB USB stick. Didn't work; won't boot. OK, I'll wipe the stick and use it for the next thing... But the stick is formatted with the isofs file system, and Gparted doesn't allow me to reformat it - in fact Gparted can't see anything on the stick, says it has no partition table, and that it can't add a new one. Windows tells me the same. The irritating thing is that Ubuntu mounts the stick and shows the files perfectly (Hardware)