All software configuration guides and command references can be found on Cisco Documentation Site <http://www.cisco.com/univercd/home/home.htm>
This link will take you to the Cataylst 3750 Software Configuration Guide for release 12.2(25)SEE, "Working with the Cisco IOS File System, Configuration Files, and Software Images" section.
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12225see/scg/swiosfs.htm#wp1017927
Good luck with upgrading.
HTH
--Leon
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