Storage

Computer Memory(Storage)

It is a data storing device under hardware component were various types of computer data are stored

Types:

Primary memory

 it is computer memory that is accessed directly by the CPU. This includes several types of memory, such as the processor cache and system ROM. However, in most cases, primary memory refers to system RAM

RAM(Random-access memory):

 It is the hardware in a computing device where the operating system (OS), application programs and data in current use are kept so they can be quickly reached by the device's processor.

When the computer is rebooted, the OS and other files are reloaded into RAM, usually from an HDD or SSD

SRAM (static RAM) is random access memory (RAM) that retains data bits in its memory as long as power is being supplied. Unlike dynamic RAM (DRAM), which stores bits in cells consisting of a capacitor and a transistor, SRAM does not have to be periodically refreshed

Dynamic random access memory (DRAM) is a type of semiconductor memory that is typically used for the data or program code needed by a computer processor to function. DRAM is a common type of random access memory (RAM) that is used in personal computers (PCs), workstations and servers

ROM(Read-only memory):

It is both a non-volatile and permanent form of primary storage 

A programmable read-only memory (PROM) is a form of digital memory where the setting of each bit is locked by a fuse or antifuse. (eFUSEs can also be used) It is one type of ROM (read-only memory). The data in them are permanent and cannot be changed

EEPROM (electrically erasable programmable read-only memory) is user-modifiable read-only memory (ROM) that can be erased and reprogrammed (written to) repeatedly through the application of higher than normal electrical voltage. Unlike EPROM chips, EEPROMs do not need to be removed from the computer to be modified

Secondary storage

Secondary memory is also termed as external memory and refers to the various storage media on which a computer can store data and programs or in other words where programs and data are kept on a long-term basis. Common secondary storage devices are the hard disk and optical disks.

 Hard disk is a spindle of magnetic disks, called platters, that record and store information