Question: In which of the four I/O software layers is each of the following done. (a) Computing the track, sector, and head for a disk read.

In which of the four I/O software layers is each of the following done.
(a) Computing the track, sector, and head for a disk read.
(b) Writing commands to the device registers.
(c) Checking to see if the user is permitted to use the device.
(d) Converting binary integers to ASCII for printing.

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