jecasc - 4:39 pm on May 16, 2010 (gmt 0)
I am at a loss to understand why scanned images are saved - it serves no obvious purpose.
The purpose is simple: To speed up the copying process. If you need 500 copies of one sheet it is a lot faster to take one picture of the page, safe it and then print it 500 times than to take 500 pictures for 500 copies. Also this allows various features for copiers, like automatically sorting copies, or scaling or printing multiple pages in reduced size on one page.
However even if the copies are stored I can think of no reason why the files could not be overwritten after a few minutes. And there is no way this costs 500$ to implement a basic security feature like this. Or they could store the files in non persistant storage devices where the data is lost when the machine is turned off.
And I would expect this information to be on the first page of the manual, and you could expect that companies or public authorities at least clear the harddrives before selling the machines. Or that used machine dealers do this before they resell them. However companies and administrations do not even wipe computer harddrives.