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c++.dos - Hard disk controller depending on system timer

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Hello.   I heard that hard disk controller depends a lot on the 08h =
interrupt timer.  I heard this from a book for programming games in =
real-mode.  I am not sure weather hard disk controllers depend on the =
08h timer while the CPU is in protected-mode.  I don't want to risk my =
hard disk for just a low-level game.

Can any one tell me weather hard disk really depends on 08h timer while =
the CPU is in protected-mode?
Nov 23 2001