After the rare and easy to use a Airbook the board made after six weeks every second loud hits and can no longer be addressed. The white indicator light is still on and the disk rotates quietly as ever, but it is no longer recognized. On the wobbly connecting cables it is not. It is the first record for 20 years, which has given up the ghost. As a backup disk, it is not appropriate at this quality. And I'm not the first, in which she stops working after a short time.