Posted this earlier in a Windows 10 thread in EDMW ...
For those planning to buy a thumbdrive to use as an installer, I suggest to avoid buying the Sandisk Cruzer Blade.
I bought an 8gb one to use as a Windows 8.1 Pro installer ... the Media Creation Tool does not detect it even though my existing Windows (7, on the laptop I was trying to do it on) did. The Media Creation Tool successfully detected 3 other thumbdrives - a Toshiba 8gb, an old Sandisk Cruzer Slice 8gb, and 1 more I can't remember what model it was right now. Ended up using the Sandisk Cruzer Slice as my Windows 8.1 Pro installer, and the Cruzer Blade took over the duties of the Cruzer Slice.
Now I need to buy another thumbdrive to use as my Windows 10 installer, I am definitely not going to get another Cruzer Blade.