I have 4GB and 8GB flash drives currently serving as Live USB drives with persistence running Quantal and Saucy. For the sake of troubleshooting the Flash/LightDM-login problems more invasively, I would like to make another Live setup with persistence running Raring, but I don't have another bigger flash drive on hand.

But I do have several 1GB flash drives. I tried making a Live USB with one of those, setting persistence storage to 100MB (via UNetBootin). But when I tried to use it I kept getting no-space-available sorts of errors. So I concluded that 1GB was too small to serve both for the Live USB and the persistence storage. True? (Though I think I observed after the fact that UNetBootin had preserved some files and folders that were already on the drive, so maybe I just need to try again after deleting everything or formatting.)

I then tried to set up a Raring Live DVD with persistence using either a flash drive or the internal hard drive, but so far have failed.

In one case I used Gparted (I don't know where I was using that, since I don't now find it in the installed version of Raring) to create a single ext3 partition labeled casper-rw to serve as the persistence storage, but that didn't work for me.

For two other cases I began by running in a terminal:
    dd if-/dev/zero of=casper-rw bs=1M count=768
    mkfs.ext3 -F casper-rw
Then I copied the resulting casper-rw file both to a flash drive and to the hard drive, but booting with the Live disc and either of those running did not result in successful persistence.

Can anyone see what I was doing wrong?

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