Access speed increases as we move closer to the CPU.
Hard Drive is the slowest among the given options.
RAM is faster than Hard Drive.
Cache memory is faster than RAM.
CPU Registers are the fastest because they are inside the CPU.
So, the correct order from slowest to fastest is:
Hard Drive $\to$ RAM $\to$ Cache $\to$ CPU Registers
Online Test Series, Information About Examination,
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Online Test Series, Information About Examination,
Syllabus, Notification
and More.