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Second Boot Device

Common Options : Floppy, LS/ZIP, HDD-0, SCSI, CDROM, HDD-1, HDD-2, HDD-3, LAN, Disabled

Quick Review

This BIOS feature allows you to select the second device from which the BIOS will attempt to load an operating system. If the BIOS finds and loads an operating system from the device selected through this feature, it won't load another operating system, even if you have one on a different device.

By default, HDD-0 is the second boot device in practically all motherboards. But, unless you boot often from the floppy drive (which is often the first boot device), it is better to set your hard disk (HDD-0) as the first boot device. This will shorten the boot process because the BIOS no longer needs to check the floppy drive for a bootable operating system.

More importantly, doing so prevents the BIOS from loading the wrong operating system in case you forgot to remove the boot disk from the floppy drive! This also indirectly prevents the loading of any virus-infected floppy disk that was left in the drive during booting.


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