User manual
19
USB Features Submenu of the Advanced Menu
The USB Features Submenu allows for the enabling or disabling of SCSI SubClass support, thus enabling support for 
USB mass storage devices that belong to the SCSI SubClass. Examples of such devices include USB memory keys and 
floppy drives.
Figure 10. USB Features Submenu
Table 10: Fields, Options and Defaults for the USB Features Submenu of the Advanced Menu
Menu Field Options Default Description
Legacy USB 
Support:
• Disabled
• Enabled
[Enabled] When Enabled is selected, Legacy USB Emulation is 
enabled and USB devices are available without a USB-
aware OS. When Disabled is selected, Legacy USB Emula-
tion is disabled.
SCSI SubClass 
Support:
n
Disabled
n
Enabled
[Disabled] When Enabled is selected, USB devices that belong to the 
SCSI subclass in the mass storage class (e.g., USB Memory 
Key) are enabled. Note that enabling this feature may 
cause the system to hang during POST, depending on the 
device that is connected.
F1  Help
ESC Exit
Select Item
Select Menu
-/Space
Enter
F9 Setup Defaults
F10 Save and Exit
Change Values
Select Sub-Menu
▲
Main Advanced  Security Power Savings Exit
Item Specific Help
[Disabled]
The feature is disabled.
[Enabled]
Legacy USB Emulation
is enabled, and USB
devices are available 
without USB-aware OS.
USB Features
PhoenixBIOS Setup Utility
Legacy USB Support: 
 SCSI SubClass Support: [Enabled] 
[Enabled]
Advanced Menu










