Protogo USB installation failure and subsequent flash drive problem

Hello,

Help please. I have two problems. I started to create a Mac OS X Basic Profile installation on a brand new Lexar USB 3.0 flash drive. The process started, but did not complete despite running for many hours. I now find that the flash drive is unusable. It will not mount onto the Desktop, although it has appeared in Disk Utility. I cannot repair or format it from there. I tried using the various TechTool repair options, but, again, the drive won't respond. It locks up Disk Utility and TechTool and I have to Force Quit.

Can you help?

Thanks,

Nick.