Kernel Mode and the System Call
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
A system call is a request from user mode asking kernel mode to perform an action — crossing an isolation boundary that protects the kernel and programs from each other.
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A records app never opens the disk itself; a request crosses the line.
Watch for
The boundary protects; the call is the door.
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- Nothing yet depends on this.