Ah, against my better advise I purchased a USB EXTERNAL HD: WesternDigital "My Book" USB drive:
http://www.wdc.com/en/products/products.asp?driveid=723 .
I want to use SuperD to prepare a bootable back up of LEOPARD ( which is located on a FireWire external hard drive ),
Will the ( a ) USB external hard drive be capable or even fast enough to boot Leopard ( and by next week end ) the SnowyLeopard ?