Computer Information</span> I/O Devices --Examples of input devices: -keyboard -optical character reader -microphone --Examples of output devices: -video screen -printer -loudspeaker Ports and Connectors ---Port are categorized by their mode of transmission: --Parallel port -Standard parallel port (printers) -Small Computer System Interface (SCSI) --Serial port -Standard serial port (modem, mouse) -Musical instrument digital interface (MIDI) -Universal Serial Bus (USB) --Connectors -Male have one or more pins -Female have locators that match the pins on the male Storage -Hard Drive -Floppy Drives -CD-ROM -DVD -R-CD-ROM -RW-CD-ROM -Zip Drives Disk Capacities Floppy: 1.4 MB -Hard disk: 20 GB – 160 GB -CD: 700 - 800 MB -DVD: 4.7 GB - 17 GB Disk Fragmentation -Fragmented disk shows spaces where data has been removed -Defragmenting has placed all files in contiguous spaces -Defragmenting a drive will increase efficiency for file retrieval CD-ROM and Optical Disks --CD-ROM (compact disk ROM) -650 MB of information --DVD-ROM (digital versatile disk) -4.7 gigabytes --CD-R (compact disk-recordable) - --Magneto-optical (MO) -230 MB, 650 MB, 1.3 GB -supports read and write operation. Memory --RAM = Random Access Memory -The space available to a computer to use while performing operations. -The space is emptied out when the computer is turned off. --ROM = Read Only Memory -The memory programmed by the manufacturer containing system information. -Cannot be overwritten without special software. <span style=\'color:red\'>Computer Units ---Quantity/size/capacity --Kilo byte -- KB -one KB is 1024 (210) --Mega byte -- MB -one MB is 1024KB -e.g., 4096MB = 4MB --Giga byte -- GB -one GB is 1024MB --Tera byte -- TB -one TB is 1024GB
thanx......dunno what 4 but thanx............a bit of a random topic Merged Post: thanx......dunno what 4 but thanx............a bit of a random topic
