It can help you recover from a failed boot.
add/remove programs
My Computer, right click on floppy drive-> Format... In the next windows choose Create a MS-DOS startup disk
It is called rescue disk or emergency disk. It is useful when recovering from a failed hard drive that you cannot access itsresources.
An emergency start-up disk
add/remove programs applet in the control panel !
Every version of Windows, even Vista, bundles a copy of MS-DOS. You can create an MS-DOS boot floppy by formatting a floppy disk, and checking the "Create an MS-DOS startup disk" box.
Go to My Computer, right click on your floppy or dvd/cd, click format, check create startup disk, click start. DONE B*tch
The system disk is the partition from which the operating system was loaded at startup.
bootdisk.com........you can get it from here
In the Add/Remove Programs icon is a tab called Startup Disk, click the tab
https://www.youtube.com/watch?v=LKIzI_aQo60 can show you how to do it on a modern PC
press on startup to display the bootable disks.