FRONT PANEL

A front panel was used on early electronic computers to display and allow the alteration of the state of the machine's internalregisters and memory. The front panel usually consisted of arrays of indicator

lamps, toggle switches, and push buttonsmounted on a sheet metal face plate. In early machines, CRTs might also be present (as an oscilloscope, or, for example, to mirror the contents

of Williams-Kilburn tube memory). Prior to the development of CRT system consoles, many computers such as the IBM 1620 had console typewriters.

Service Tag

A unique number given to Dell products that is often found on the bottom, side, or back of

the product. As seen in the picture, this is an example of what the DellService Tag looks

like, which in this case is next to theMicrosoft Windows Product Key. This Service Tag can

help identify your computer for online support and drivers and is also used to reset

passwords on Dell laptop computers.

Optical disc drive

From Wikipedia, the free encyclopedia

A CD/DVD-ROM computer drive

The CD/DVD drive lens on an Acer laptop

A Blu-ray drive holds independent lenses for Blu-ray and DVD/CD media. Pictured are lenses from a Blu-

ray writer in a Sony Vaio E series laptop

In computing, an optical disc drive (ODD) is a disk drive that uses laser light or electromagnetic waves within or near the visible light spectrum as part of the process of reading or writing data to or from optical

discs. Some drives can only read from certain discs, but recent drives can both read and record, also called burners or writers. Compact discs, DVDs, and Blu-ray discs are common types of optical media

which can be read and recorded by such drives. Optical disc drives that are no longer in production include CD-ROM drive, CD writer drive, and combo (CD-RW/DVD-ROM) drive. As of 2015, DVD writer

drive is the most common for desktop PCs and laptops. There are also DVD-ROM drive, BD-ROM drive, Blu-ray Disc combo drive, and Blu-ray Disc writer drive which are not so much demand in the market.

Optical disc drives are an integral part of standalone appliances such as CD players, VCD players, DVD players, Blu-ray disc players, DVD recorders, certain desktop video game consoles, such as Sony

PlayStation 4, Microsoft Xbox One, and Nintendo Wii U, and certain portable video game consoles, such as Sony PlayStation Portable. They are also very commonly used in computers to read software and

consumer media distributed on disc, and to record discs for archival and data exchange purposes. Floppy disk drives, with capacity of 1.44 MB, have been made obsolete: optical media are cheap and have vastly

higher capacity to handle the large files used since the days of floppy discs, and the vast majority of computers and much consumer entertainment hardware have optical writers. USB flash drives, high-

capacity, small, and inexpensive, are suitable where read/write capability is required.

Disc recording is restricted to storing files playable on consumer appliances (films, music, etc.), relatively small volumes of data (e.g., a standard DVD holds 4.7 gigabytes) for local use, and data for distribution, but only on a small scale; mass-producing large numbers of identical discs is cheaper and faster than

individual recording.

Optical discs are used to back up relatively small volumes of data, but backing up of entire hard drives, as of 2015, typically containing many hundreds of gigabytes or even multiple terabytes, is less practical than with the smaller capacities previously available. Large backups are often made on external hard drives,

as their price has dropped to a level making this viable; in professional environments magnetic tape drives are also used.

Reset button

a reset button is a button that can reset a device. On video game consoles, the reset button restarts the game, losing the player's unsaved progress. On personal computers,[NB 1] the reset button clears the

memory and reboots the machine forcibly. Reset buttons are found on circuit breakers to reset the circuit. This button can cause data corruption so this button often doesn't exist on many machines. Usually, in

computers and other electronic devices, it is present as a small button, possibly recessed into the case or only accessible by a pin or similar thin object, to prevent it being pressed accidentally .

Power button

to start on computer

usb ports USB 2.0 was released in April 2000, adding a higher maximum signaling rate of 480 Mbit/s

called High Speed, in addition to the USB 1.xFull Speed signaling rate of 12 Mbit/s. Due to bus

access constraints, the effective throughput of the High Speed signaling rate is limited to 35 MB/s or

280 Mbit/s.[25][26]

Further modifications to the USB specification have been made via Engineering Change

Notices (ECN). The most important of these ECNs are included into the USB 2.0 specification

package available from USB.

Headphones port