An image is like a compressed photograph of all the files on a partition. Every file, folder, and user setting ... everything.
Let's say you imaged the partition that contained Win98, when everything was perfect. After a month or so, when you would normally format and reinstall Windows, you would instead simply change the boot order in the BIOS to CD-ROM, and boot with the image. Then you would decide where to place the image, and it would format the chosen partition as it installed itself. All the old files would be gone, and everything would be perfect again. It would take less than an hour.
Newer programs like this can create images that only contain the files on the partition, without the free space. That makes the image much smaller. You could easily place the entire image on one or two CDs.
The imaging program creates a virtual floppy disk, which runs in a proprietary version of DOS. That virtual floppy can be edited by the user.
The bootable virtual floppy disk will be part of the image. The image can be stored on a separate partition on the hard drive, and/or on CD-R disks. This gives you two different ways to restore a partition.
An image can be created that contains the contents of <i>any</i> partition, not just the one that contains the operating system ... so it is also an excellent way to backup your personal files. The image can be spanned into different sizes, and the contents can be verified during the creation process (and this includes the file system) so that there will be no errors.
Norton Ghost and Drive Image are the two most popular programs of this kind.
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