Can't update flash drive from 5.0.0 to 5.1.0

[wonderwrench]

I installed 5.0.0 to a 4 gig flash drive back when it first came out and it was and is bootable to this day. I had some time yesterday so I tried to update the flash drive to 5.1.0. The flash drive is not visible in windows 7 64 bit or in the memtest 5.1.0 installer. It does show up in disk management but all options are grayed out. Is there a way to fix this problem?

Thanks
Bill

[keith]

You can use 'diskpart' to clear the partition information on the drive.

Enter 'list disk' to list all the disks in your system. Then, type 'select disk n' where n is the disk number of your drive. Then enter 'clean' to remove the partition information. After that, you can now use disk management to re-format your drive.

[wonderwrench]

Thanks for the help, that did the trick.