I was looking into something similar to this for work recently and came across a fellow who documents how he implemented an IDE interface with a Microcontroller, and even discusses ATAPI:
https://www.pjrc.com/tech/8051/ide/wesley.html#hwdesc
could have some worthwhile information for anyone working on this.
https://www.pjrc.com/tech/8051/ide/wesley.html#hwdesc
could have some worthwhile information for anyone working on this.