I assume he is talking about the boot disk for the imaging program.
As an aside for users of Macrium Reflect Free Edition: you MUST make a boot disk. Otherwise, you CANNOT restore an image. The paid version does not have this restriction. I think other imaging programs have various requirements.
Which reminds me:
For imaging programs in general (Macrium Reflect Free, Acronis, etc): Is it necessary to make a new boot disk periodically???
Imagine this scenario:
January 2010: I download Macrium Reflect Free, make a boot disk, and an image of C.
Over the next 2 years, Macrium releases various updates and new editions of the program.
January 2012: I download and install the newest version.
January 2013: I have a system failure and attempt to restore the image made in Jan 2010 using the boot disk made in Jan 2010.
Will it fail because the disk was not made with the Jan 2012 version of Macrium???
I am guessing it will work, assuming the boot disk has not itself deteriorated, but would like better insight or confirmation.
If it works, does that mean that the boot disk is effectively a self-contained version of the 2010 version of the program--and in fact would work even if Macrium was not on my PC in 2013---all I would need is the boot disk and the 2010 image file?
Or does the boot disk still interact with and require a version of Macrium in order to restore? If so, what version in this scenario?