Samsung SE-T084M-RSWD - Manual (Page 18)

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When the On/Off light is orange, do not turn the PC off or remove the External DVD Writer as it may
cause damage in the drive.
How to Use a Horizontally Installed Drive
You can use 3.15 Inch or 4.72 Inch (8cm or 12cm)
discs.
The drive cannot read the disc properly if any part of the
disc is place outside the tray guiding line.
- Only standard round type disc(8cm,12cm) is available.
- Do not use the external drive vertically.