Computer Science - Operating Systems Concepts - Discussion

Reading from a disk is very slow compared to accessing (real) memory. In addition, it is common to read the same part of a disk several times during relatively short periods of time. For example, one might first read an e-mail message, then read the letter into an editor when replying to it, then make the mail program read it again when copying it to a folder.

Consider how often the command ls might be run on a system with many users. By reading the information from disk only once and then keeping it in memory until no longer needed, one can speed up all but the first read. This is called disk buffering, and the memory used for the purpose is called the buffer cache.

To speed up main memory read operation, read operation is also improved when cache is used.

D is the correct answer.

To speed up the main memory read operation.

Yes, D is the correct answer.

D is the correct answer.

To speed up the main memory read operation.

Disk Buffer also called disk cache or cache buffer is the embedded memory in a hard disk drive (HDD) acting as a buffer between the rest of the computer and the physical hard disk platter. So Correct option is [A].