How Can I Reboot My Computer Without the Disk?by Larry Amon
Booting up a computer basically means to turn it on, so rebooting is the same as restarting. Rebooting is often the resolution for many computer problems, because everything starts again and the memory is cleared.
A disk can refer to the hard drive or a floppy disk. Floppy disks have nothing to do with restarting your computer unless they are boot disks. If you don't have a hard drive you can restart your computer but it will give an error message telling you that there is no hard disk. You can enter the BIOS, however.
Booting With Disc or Flash Drive
You can boot into something other than the operating system on your hard drive. If you have a program or mini operating system on a CD or flash drive or something similar you can set your BIOS to boot first to the device. The computer will then run the program directly from the drive.
Why Boot Without the Disk?
You might want to boot into a CD or flash drive to install an operating system, but you would need a hard drive before you could install it. The only reasons you might want to boot with no hard drive are either to troubleshoot a computer or to work with a tiny operating system that can run from removable media.
- photo_camera disk image by Danil Vachegin from Fotolia.com