American Megatrends MB980 User Manual page 42

BIOS SETUP
EHCI Hand-off
Enabled/Disabled. This is a workaround for OSes without EHCI hand-off
support. The EHCI ownership change should be claimed by EHCI driver.
USB Mass Storage Driver Support
Enable/Disable USB Mass Storage Driver Support.
USB Transfer time-out
The time-out value for Control, Bulk, and Interrupt transfers.
Device reset tine-out
USB mass Storage device start Unit command time-out.
Device power-up delay
Maximum time the device will take before it properly reports itself to the
Host Controller. 'Auto' uses default value: for a Root port it is 100ms, for
a Hub port the delay is taken from Hub descriptor.
38 MB980 User's Manual