Samsung NP900X5N-L01US User Manual page 61

Troubleshooting
How can I start my computer in DOS?
To start the computer in DOS via a USB device:
1
Turn on the computer.
2
Before the Samsung logo appears, press the F2 key several
times.
3
Select the Boot menu.
4
Select Boot Device Priority.
5
Select the USB device for Boot Option #1.
6
Set Fast BIOS Mode to Off.
7
Set Secure Boot Control to Off.
8
Set OS Mode Selection to CSM OS.
9
Select Save → Ok to save and restart.
Samsung Recovery
What is a Recovery Area?
The computer has an additional partition for restoring data or
saving backup files (only for models with the Samsung Recovery
application). This partition is called a Recovery Area and it
includes a recovery image comprised of the operating system and
applications.
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