Asus RS726Q-E7/RS12 - Manual (Page 168)

7-10 Chapter 7: Driver installation
4. Select Yes using the <Tab> key when asked if you have the driver disk, then
press <Enter>.
Main Menu
Do you have a driver disk?
Yes No
5. You have multiple devices which could serve as source for a driver disk. Choose
one you like to use and select OK, then press <Enter>.
OK Cancel
Driver Disk Source
You have multiple devices which could
serve as source for a driver disk.
Which would you like to use?
sdc
sdd
sdb
sr0