Is the program file that brings up the option to restore the image run from the Autoexec.bat or Config.sys files on the startup disk? If so, access them with the 'edit' command and see if the reference to the image file gives a location. Match that and it should work (theoretically).
One proviso,,,these oem disks generally require you to boot from the floppy with the HD in original setup state (i.e. prior to any format/reloading etc) to restore the saved image. The only other way is to try and get a copy of the imaging software from someone (Seagate backup, or some such) that originally raised the image file.
What software is needed from this image that he had before anyway?
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When all else fails, read the manual!