Memory identifies data storage that comes in the form of chips and is used to store data and programs on a temporary or permanent basis. There are two main types of memory storage which are random- access memory (RAM) and read-only memory (ROM). Inside the system unit, ROM is attached to the motherboard.Random-access memory can read data from RAM and write data into RAM in the same amount of time. RAM capacity is measured in bytes. It is volatile which means that it loses the information/data stored on it when the power is turned off. In order to retrieve an important file at a later date, one needs to store it on a separate, non-volatile, storage medium (such as a flash drive or hard-drive) so that, even though the information is erased from RAM, it is stored elsewhere. RAM has different slots where it stores data and keeps track of addresses. Read-only memory cannot be written to and is non-volatile which means it keeps its contents regardless of whether the power is turned off or not. Flash memory (solid-state) is starting to replace ROM. It is also a non-volatile memory chip that is used for storage on devices, like mobile phones, tablets, digital cameras, etc. This type of memory can often be found in the form of flash drives, SD cards, and Solid-State hard drives. The reason for this is so that the data can be quickly updated over time while taking up a smaller amount of physical space in comparison to its precursors. Flash memory is also more resistant to outside forces, such as electro-magnetic fields or shock, than other memory alternatives such as traditional hard-drives.
An optical disc is a flat, circular disc that stores data and is made out of a very strong plastic called polycarbonate substrate. This helps to protect the disc with many layers of coating. Data on these discs are read optically, which means that they store data using laser beams. Data can be stored on one or both sides of the disc. The track, which is a single spiral around the disc, spins from inside the center track (or groove) to the outermost track for the data to be read. Most people today have already switched from VHS movies to DVD movies, and now to Blu-ray DVDs. The advancement in technology has made viewing and burning capabilities for DVDs and CDs much more beneficial. These optical discs do not degrade, like VHS and magnetic media do. Optical discs are used in our every day lives for storage, backing up, photos, movies, music, and much more.
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Flat display devices have become increasingly popular over the years because of their slim design and accessibility. Monitors today must be able to provide full color and gray scale, high efficiency and brightness, the ability to display full-motion video, wide viewing angle, and a wide range of operating conditions.[39] Consumers today want these devices to be thin and light weight, be insensitive to magnetic fields, and not produce any x-rays. All of these attributes are not possible with the cathode ray tubes that are generally found in older televisions or monitors. There are electroluminescent displays, plasma display panels, vacuum fluorescent displays, and field-emission displays all being sold today. The first are used in industries and medical fields because of how durable they are under many temperatures. Plasma displays are usually used in televisions. Vacuum fluorescent displays are used for low information displays like on appliances or small electronics. Liquid-Crystal Displays (LCDS)are the most commonly manufactured displays at this time. 2ff7e9595c
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