Storage Hardware Storage capacity of computer is expressed in bits, bytes, kilobytes, megabytes, gigabytes, terabytes, petabytes or exabytes.
Bit = short for binary digit (0s and 1s)Bytes = 8 bits (usually represent one character, digit, or symbol)Kilobyte (KB) = 1,024 BytesMegabyte (MB) = 1, 024 KBGigabyte (GB) = 1,024 MBTerabyte (TB) = 1,024 GBPetabyte (PB) = 1,024 TBExabyte (EB) = 1,024 PB
Primary StorageRAMRAM (random access memory)is the place in a computer wherethe operating system, applicationprograms, and data in currentuse are kept so that they can bequickly reached by thecomputers processor.
Secondary StorageAny storage device designed to retaindata and instructions (programs) inrelatively permanent form.
Tape Storage (magnetic tapes, cartridge tape units) Magnetic Tapes are especially popular for back-up storage.Diskette Storage (floppy disks, diskettes) Floppy Disks are probably the most common storage device, especially for users of PC.
Hard Disks Rigid metal platters that hold data as magnetized spots.
Optical Disks CD-ROM- Compact Disk Read-Only Memory CD-R- Compact Disk Readable CD-RW- Compact Disc Re-writable DVD-RW- Digital Versatile Disc Recordable WORM Disks- Write-Once-Read-Many
Mass Storage Device USB Flash Drive- are typically removable and rewritable and muck shorter than a floppy disk.
Solid-State DriveA data storage device that uses solid-statememory cards to store persistent data.
Output HardwareDevices that translate informationprocessed by the computer into aform that humans can understand.