You’re welcome but I’m not trying to instruct, I am just trying to share what I have learned in the past 6 years. There are many things that I can not publicly discuss about the CD, DVD, HD, Blue-ray, Xbox, etc specifications. But I can share what is already considered ‘common public knowledge’ so to speak.
I think the biggest thing you should understand is that there are very major differences between optical discs and hard drives. I understand what you mean about talking to a hard drive through the BIOS and having a lot of control. However, this same thing is not as true for CD/DVD.
As I mentioned before, the sector size is defined in the specification and you can not simply read or write a byte from here or there at random (you must read/write entire sectors). Try to consider a sector as the absolute smallest thing on a CD. Even though CDs are random access, you still have to read and write complete sectors at a time. Also, when writing to CDs it must be sequential and you must write an entire sector during the write. In other words, you can not write a sector near the inside of the CD and then write the next sector near the outside. It just doesn’t work like hard drives do. But, you can read any valid sector from any place on the disc in any order that you wish. A valid sector is a sector that the firmware of the drive has determined to be somewhere between the end of leadin (TOC) and the beginning of leadout. And, of course, the firmware only knows this by first scanning the TOC when you insert the CD. So, the theory of placing a ‘rogue’ sector on the CD that is not referrenced in the TOC is not possible.
I can not guarantee that all of the above is 100% accurate but I bet it’s pretty close. I have tried to word it so that it makes the most sense. I hope it helps and feel free to ask more questions.