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1- Device header
2- Local Procedures/Data
3- Strategy
4- Interrupt procedures
5- Command processing procedures
All Device drivers in ms-dos has to have all these commands.
Under Windows 3.0, the problem is a little more complicated, and in Windows 3.1 is a little diferent, and so on.
Windows 95 uses an architecture driver/mini-driver that is easy to the people make specific code for the device.
Unix uses a diferent architecture because the I/O is separated in two subsystems, I/O by character and I/O by block.