Macbook Air 13-inch Mid 2013. If i try to use my Sandisk Extreme USB 3.0 16GB key in 10.8.5 this corrupts all partitions inside the usb key with lost of data, the corruption happen when i use the key or simply dismount the volumes. After the corruption if that key is directly connected to USB 3.0 i can't repartition the key either initialize the partition. To reuse the usb key i have to use an usb 2.0 hub, with an usb 2.0 connection the problem disappear and i can repartition or initialize the key. I have tried also after smc/pram/nvarm reset, but the problem remain. In another Mac with 10.8.4 and USB 3.0 no problem. Already sended the feedback to Apple, please check if you have same problem.