Discuss any two kinds of storage technologies used in modern computers.

At present the following three kinds of storage technology are commonly used in modern computers. Semiconductor storage technology. Magnetic storage technology. Optical storage technology. Other types of unorthodox means of storage technology seldom used are Paper based storage technology. Vacuum Tube Memory. Electro-Acoustic Memory. Semiconductor Storage Technology Semiconductor memory is an electronic data storage device, often used as computer memory, implemented on a semiconductor-based integrated circuit. Examples of semiconductor memory include non-volatile memory such as read-only memory (ROM), magneto resistive random-access memory (MRAM), and flash memory. It also includes volatile memory such as static random-access memory (SRAM), and dynamic random-access memory (DRAM). Magnetic Storage Technology Magnetic storage uses different patterns of magnetization in a magnetizable material to store data and is a form of non-volatile memory. The information is accessed using one or more read/write heads. Magnetic storage media, primarily hard disks, are widely used to store computer data as well as audio and video signals. Other examples of magnetic storage media include floppy disks, magnetic recording tape, and magnetic stripes on credit cards. Optical Storage Technology Optical storage is any storage method in which data is written and read with a laser for archival or backup purposes. Typically, data is written to optical media, such as CDs and DVDs. Paper Based Storage Technology A few technologies allow people to make marks on paper that are easily read by machine - these are widely used for tabulating votes and grading standardized tests. Barcodes made it possible to have some computer readable information securely pasted on paper, to be read through specified machines (Barcode readers). Vacuum Tube Memory Selectron tube used a large vacuum tube to store information as Primary Storage devices. Electro-Acoustic Memory It uses mercury to store information which was dynamically volatile, cycle sequential read/write storage and was used for primary storage. *Note : Students are required to explain any two of the above storage technologies.