Tray controlling method for using firmware for detecting different inclined position

A method for controlling tray retraction of a disk drive that includes a tray for carrying a disk, a detect switch, a DC motor, a firmware and a traverse module, wherein a voltage is applied to the DC motor to move the tray in sequence through a fourth position, a third position, a second position to a first position meanwhile the detect switch is correspondingly shifted in sequence through a fourth inclined position, a third inclined position, a second inclined position to a first inclined position, wherein a third signal is transmitted to the firmware when the detect switch is shifted to the third inclined position, and a fourth signal is transmitted to the firmware when the detect switch is shifted to the second inclined position, the tray retraction control method comprising the following steps:

• moving the tray from the fourth position to the third position, wherein the traverse module is disposed at a lower position;
• receiving the third signal;
• moving the tray from the third position to the second position, wherein the traverse module is raised from said lower position to an upper position;
• receiving the fourth signal;
• determining whether the disk is present on the tray or not;
• and
• moving the tray from the second position to the first position, wherein the traverse module is disposed at said upper position, the traverse module being retained at said upper position during movement of the tray from the second position to the first position.