In this case unetbootin was installed on a windows machine and the flash drive was created in windows, proceedure is same when running unetbootin from Ubuntu.
How old is the computer? I have an old one that mentions USB-ZIP in BIOS but it won't boot a flash drive. try the drive on a different computer. The flash drive should appear in Harddrives on a modern computer.
I'm not sure what you are saying about menu list, I don't think there is one in a 'persistent' install, however a flash drive with a casper-rw partition on it should be able to store the changes when booting a Live CD, you just have to boot the CD as persistent. Home-rw partition stores the stuff that would be stored in home on a full install, casper-rw stores all the other changes.
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