Types of Secondary memory Mass storage devices:. Primary memory is accessed using address and data buses by the CPU, while secondary memory is accessed using input/ output channels. Primary memory is the memory that is directly accessed by the CPU to store and retrieve information, whereas the secondary memory is not accessible directly by the CPU. Faster than secondary memories. This type of memory is also known as external memory or non-volatile. Flash/SSD. DEFINITION - Primary memory is computer memory that a processor or computer accesses first or directly. Contents of secondary memories are first transferred to main memory, and then CPU can access it. The primary memory or primary storage refers to the RAM - Random Access Memory and the CPU Memory. secondary storage cannot be directly accessed by the CPU and is also external memory storage. Information stored is permanent unless one deletes it intentionally. Secondary Memory. Secondary memories are the external memory of a computer. In addition to secondary memory, many computer systems also utilize primary memory, tertiary memory, and offline storage. The secondary memories of a computer will be much larger than primary memories. Secondary memory is also termed as external memory and refers to the various storage media on which a computer can store data and programs. Secondary memories are cheaper than primary memories. A computer cannot run without the primary memory. In this type of memory the cost per bit of storage is low. In secondary memory, data is first transferred to main memory and then routed to processing unit. That allows a processor to access stores running programs and currently processed data that stored in a memory location. Secondary memory overcome this limitation by providing permanent storage of data and in bulk quantity. All those types of computer memories that are directly accessed by the processor using data bus are called primary memory. The examples of secondary memory are Hard disk, CD, DVD, etc.

Difference between Primary storage and secondary storage.

Data stored is not uniform in secondary memory. It is slower than the main memory. It's very fast compared to Hard Drives. Secondary storage devices are volatile in nature, it means that data does not discard while power turn-off, in which all data store for long time.Secondary memory has the speed of access of data is very slow compare to primary memory, and cheaper as well. It allows a processor to access running execution applications and services that are temporarily stored in a specific memory location. Primary memory is also known as main memory or may also refer to "Internal memory." Primary memory is the main memory (Hard disk, RAM) where the operating system resides.

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