The invention includes a slot-in disk drive with a release device, wherein a side of a traverse is pivoted to a casing. A spindle motor disposed on the traverse rotates an optical disk with a non-data area. The release device is set on the traverse adjacent to the spindle motor. A first hole is formed on the traverse and located in a position corresponding to the non-data area. A release bar protrudes from a bottom of the casing for inserting into the first hole. A buffer is installed between the release bar and the traverse for isolating vibration.