BIBLIOGRAPHY
DISK STRUCTURE
http://home.att.net/~rayknights/pc_boot/w95aboot.htm
http://www.pcguide.com/ref/hdd/file/fatRoot-c.html
MAGIC NUMBERS
http://www.clueless.com/jargon3.0.0/magic_number.html
(dear old jargon file :) )
http://www.dinopolis.org/documentation/misc/theses/cdaller/node92.html
STEGANOGRAPHY AND STEGANALYSIS
http://www.outguess.org/info.php
http://www.neobytesolutions.com/downloads/invsecr.exe
(30 days free trial version)
And a lot of the documents referred by these ones.