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870 Motherboard Setup - Floppy Boot Options

Menu Item Description
Legacy Floppy Drives  Specifies the boot sequence for removable devices attached to the computer. The operating system assigns a drive letter to each device in the order listed. To specify boot sequence, select the boot device with the up/down arrow keys, and press "+" to move the device up the list or "-" to move the device down the list. Changing the order of the devices changes the drive lettering.