There are Yotabits, which is equal to 1,000,000,000,000,000,000,000,000 bits, but all the worlds computers memory storage put together don't even equal 1 zetabyte, which is equal to 1,000,000,000,000,000,000,000.
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Access time is the time it takes for the processor to access the device to read or write to / from it. To put it in more human terms: Which is faster, a train that takes 60 minutes to reach its destination, or a train that takes 70 minutes to reach its destination? The first one, obviously. The access time of 60ns will be faster than access time of 70ns
Virtual memory is memory taken from your HDD and converted into ram. Ram is the actual memory chips installed in the memory modules on your motherboard that are used for running processes,programs(etc.)
Data transfer will be faster in packet switching providing the setup time in circuit switching is greater than the time required to send a packet. If not, that is setup time in circuit switching takes less time, then circuit switching is quicker.
In terms of time complexity, O(log n) is better than O(n) because it has a faster rate of growth as the input size increases.
When comparing the time complexity of an algorithm for n vs logn, the algorithm with a time complexity of logn will generally be more efficient and faster than the one with a time complexity of n. This is because logn grows at a slower rate than n as the input size increases.