When copying a single or small file over USB3 like a word doc it is transferred so fast the window never even pops up that tells you its copying which can be a bit difficult to tell if you actually did copy it or not, downside of the speed

Formatted it and the issue hasn't happened again, but it makes me a bit skeptical about the protection of the data I store on it, so I haven't used it heavily.

Will see how the ADATA replacement does, though I'm a bit skeptical at this point.09/26/13 Update: upgraded one star to three star review as replacement device seems to be functioning as advertised

Really 4.5 stars because cap is a bit loose when you store on the non-business end, also the hole for keychain is tiny and curved, therefore difficult to access, but I'm on this page because I'm looking to buy more

I use Macbook Pro Retina and maybe there's some compatibility issue b/w Mac and the drive?

n’t lose it