I have a Sandisk 8GB USB 2.0 drive - a brand I've used for years, replacing them as I lose them. I'm happy though I know there are faster USB flag drives available.
Under Windows 8.1, the drive is not identified by my Asus p8p67 pro or by a Dell 7010 running Win7 at work. It is sometimes recognized by my laptops running Win 8.0. There have been no bios changes, just the OS update on the Asus box. the Dell box is new as of late Sept. 2013.
The same thing happens with a Sandisk USB 2 4GB drive too.
I don't care about an OS drive, have run FAT only on the USB drives. Might I be better running NFTS or FAT32? (I don't sneaker net large files.)
Any ideas or similar experiences? This was easy and smooth for me for years now.