Toshiba M750 ユーザーガイド

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To insert an optical disc into the drive:

Make sure the computer is turned on.

The drive will not open if the computer’s power is off.

Make sure the drive’s in-use indicator light is off.

Press the drive’s eject button. If the drive is locked, wait a few 
seconds until the drive is unlocked.

The disc tray slides partially out of the drive (about 1 inch).

Grasp the tray and pull it fully open.

Hold the disc by its edges and check that it is free of dust.

If the disc is dusty, clean it as described in 

Place the disc carefully in the disc tray, label side up.