What is the difference between pages and blocks? A block is the smallest unit of data that an operating system can either write to a file or read from a file. What exactly is a page? Pages are used by some operating systems instead of blocks. A page is basically a virtual block. And, pages have a fixed size – 4K and 2K are the most commonly used sizes. So, the two key points to remember about pages is that they are virtual blocks and they have fixed sizes. Why pages may be used instead of blocks Pages are used because they make processing easier when there are many storage devices,
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