Fujitsu D3320 PRIMERGY BX2560 M2 Reference Manual page 40

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I
The Legacy USB Support function should be disabled if the
operating system supports USB and you do not want to boot the
operating system from USB devices.
Onboard USB Controllers
Allows the USB controllers on the system board to be enabled or
disabled. If the onboard USB controllers are disabled, all USB devices
connected are not available. Besides locally connected keyboard,
mouse and mass storage, also keyboard, mouse and mass storage via
iRMC and internally connected USB devices do not work.
Enabled
Onboard USB controllers are enabled and work as configured.
Disabled
Onboard USB controllers are disabled.
Mass Storage Device(s)
Allows the user to force a specific device emulation. If Auto is selected
the devices are emulated according to their media format. Optical drives
are emulated as CD-ROM, drives without media will be emulated
according to the drive type.
Auto
Emulation is selected according to the USB device.
Floppy
Forces USB Floppy emulation.
Forced FDD
Forces USB Forced FDD emulation.
Hard Disk
Forces USB Hard Disk emulation.
CD-ROM
Forces USB CD-ROM emulation.
40 D3320 - BIOS Setup Utility
BX2560 M2