SUPER MICRO Computer MICRO COMPUTER MOTHERBOARD P8SC8 - Manual (Page 71)

Chapter 4: BIOS
4-19
Third Boot Device
This item allows the user to set the third boot-up device. The options are
"Floppy", "LS120", "HDD", "SCSI", "CDROM", "ZIP100", "USB-FDD", "USB-
ZIP", "USB-CDROM", "USB-HDD", "LAN" and "Disabled".
Boot Other Device
If enabled, this option enables the BIOS to load the OS from another device
rather than the ones that have been specified as the first, second and third
boot up devices. The settings are "Enabled" and "Disabled".