PCchips M921 Series User Manual page 37

USB Keyboard Enable this item if you plan to use a keyboard
Support connected through the USB port in a legacy
operating system (such as DOS) that does not
support Plug and Play.
USB Mouse Enable this item if you plan to use a USB
Support mouse.
IDE HDD Block Enable this field if your IDE hard drive
Mode supports block mode. Block mode enables
BIOS to automatically detect the optimal
number of block read and writes per sector that
the drive can support and improves the speed
of access to IDE devices.
3: BIOS Setup Utility
33