I made my recovery disk out of an SD card rather than a thumb drive. We have only one computer in the house that doesn't have an SD slot, and that's my wife's 11" MBA. For her, I have an SD card reader.
I've test booted all of them using the bare SD card in the SD slot. They all boot fine that way.
The only downside is that since I used the InstallESD from the lion installer, it won't fit on a 4 GB card. I had to buy an 8.
One nice advantage to SD cards is they have a write inhibit switch on them just in case something goes horribly wrong. Not all USB drives have that.
I've test booted all of them using the bare SD card in the SD slot. They all boot fine that way.
The only downside is that since I used the InstallESD from the lion installer, it won't fit on a 4 GB card. I had to buy an 8.
One nice advantage to SD cards is they have a write inhibit switch on them just in case something goes horribly wrong. Not all USB drives have that.