Michael J. Mahon wrote:
Data cannot be read reliably until the disk is near its correct speed, and drives differ considerably in the time required to reach full speed, so it would be difficult to use the acceleration period reliably across different drives.
However there are disk protection schemes out there that read data bytes fromt eh disk without the high bit set. They are timing critical and are there to detect a signature. This was some on some later games that have differing numbers of 0 bits between the bytes.
This varying number of bits between bytes can be hard to detect and write accurately if you writing program assumes 1 or 2 bits uniformly.
Thankx, Ed