I USE MAC FOR 3 YEARS AND EVERYTHINGIS VERY GOOD. WILL NOT HANG LIKE WINDOW OR NEED TO RESTART THE COMPUTER. AND NEVER HAPPEN CRASH THE SYSTEM AND NEED TO RESTORE AGAIN. ALSO THE TIME MACHINE TO BACK UP IS ALSO VERY GOOD. AFTER U BACK UP,U CAN OPEN THE FILE AND SEE WHAT U BACK UP. AND U CAN ALSO RESTORE THE WHOLE SYSTEM. NO COMPLAIN WITH MAC AT ALL.....