Ah, just looked at those flash drives you mentioned. They are USB sticks or thumb drives as we call them. I have Puppy installed on a Compact Flash card not a USB drive. This particular PC, though made in around 2006 does not support USB booting
Besides, I deliberately wanted to use the CF card to just boot from. Sorry for any confusion.
Along similar lines.. I could get hold of a SD to IDE adaptor and install to an SD card. Now those are dropping in price like a brick. I picked up two 16gb SD cards (ok, only class 6) for less than £10 just a couple of weeks ago. Which equates to around $17US But, again, I already have the CF cards sitting around doing nothing and to me it's all about using stuff that might otherwise be discarded. Plus I don't like spending money if I can help it
(the SD cards excluded because I needed them for my camera).