This book has everything except working software. The author has decided that he'd make a small bug so you can't compile the bootsector software, and the bootsector that the software writes, isn't bootable. Mr. PODANOFFSKY, if you read this, I appreciate, as other OS programmers do, your work in this field, but the fact that you put a bug in the code, and skip over the explaination on the bootsector code, shows a lack of trust / belief that we (other programmers) are even computer literate. Thank you but I think that I can decide what will, and what will not damage up my hard drive, and if it does, I think I can fix it... hello, it's called "Sys.Com" -- to any perspective buyers of this book, wait until it's at the library or until the author writes the second edition, and fixes the bug, so that this book is actuallty useful.