Read–write memory
Read–write memory is a type of computer memory that can be easily written to as well as read from using electrical signalling normally associated with running a software, and without any other physical processes.  The related storage type RAM means something different; it refers to memory that can access any memory location in a constant amount of time.

The term might also refer to memory locations having both read and write permissions. In modern computer systems using memory segmentation, each segment has a length and set of permissions associated with it.

Types

Read–write memory is composed of either volatile or non-volatile types of storage. Typically read-write speeds are limited to its bandwidth or have mechanical limitations of either rotation speeds and arm movement delays for storage types such as Cloud Storage, Hard Disk Drive or CD-RWs, DVD-RWs, SD cards, Solid State Drive, SRAM, and DRAM, or other integrated circuitry.

History

San Francisco in 1956, IBM was the first company to develop and sell the first commercial Hard Disk Drive (HDD). The drive was the Model 350 disk storage unit, which was 3.75 Megabytes of data storage capacity and had fifty 24-inch diameter disks stacked on a spindle and sold to Zellerbach paper.

See also
 Read-mostly memory (RMM)
 Random-access memory (RAM)

References

Footnotes

Computer memory