Categorize storage devices and backup media FDD (floppy disk drive) has only 1.4 Mb storage space. Was used for backup of dataand mode of transferring data from one PC to another. As of 2005 3½-inchdrives were still common equipment on many new PCs other than laptops. Buthave become pretty much obsolete, portable storage options, such as USBstorage devices and recordable or rewritable CDs / DVDs have taken its place. HDD (hard disk drive) A device containing one or more inflexible platters coated withmaterial in which data can be recorded magnetically, together with their
read/write heads, the head-positioning mechanism, and the spindle motor in asealed case that protects against outside contaminants. The protectedenvironment allows the head to fly 10 to 25 millionths of an inch above thesurface of a platter rotating typically at 3600 to 7200 rpm; therefore, much moredata can be stored and accessed much more quickly than on a floppy disk. Mosthard disks contain from two to eight platters. Solid state vs. magnetic Solid state disk drive, a mass storage device that holds data in RAM rather thanin magnetic storage. Magnetic disk, a computer disk enclosed in a protective case (hard disk) orjacket (floppy disk) and coated with a magnetic material that enables data to bestored in the form of changes in magnetic polarity (with one polarityrepresenting a binary 1 and the other a 0) on many small sections (magneticdomains) of the disk surface. Magnetic disks should be protected from exposureto sources of magnetism, which can damage or destroy the information theyhold. Optical drives CD-ROM Compact Disc Read-Only Memory Used for data storage and datatransfer. A standard 120mm CD-ROM holds 650 or 700 Mb of data. DVD-ROM Digital Versatile Disc or Digital Video Disc is an optical discstorage media format that can be used for data storage, including movies withhigh quality video and sound. DVDs resemble compact discs as their physicaldimensions are the same but they are encoded in a different format and at amuch higher density allowing for a greater data capacity of about 4.7 GB CD-RW ● CD-RW recorder can rewrite 700 MB of data to a CD-RW disc roughly1000 times. ● CD-RW recorders can also write CD-R discs. Except for the ability tocompletely erase a disc, CD-RWs act very much like CD-Rs. ● CD-RWs cannot be read in CD-ROM drives built prior to 1997.
● CD-R is considered a better technology for archival purposes as disccontents cannot be modified. DVD-RW ● Rewritable optical disc with equal storage capacity to a DVD-R, typically4.7 GB. ● Primary advantage of DVD-RW over DVD-R is the ability to erase andrewrite to a DVD-RW disc. ● DVD-RW discs may be written to about 1,000 times before needingreplacement, making them comparable with the CD-RW standard. ● DVD-RW discs are commonly used for volatile data, such as backups orcollections of files. Dual Layer recording allows DVD-R and DVD+R discs to store significantlymore data, up to 8.5 Gigabytes per disc, compared with 4.7 Gigabytes forsingle-layer discs BLU-RAY Is an optical disc storage medium designed to supersede the standard DVDformat. Its main uses are for storing high-definition video, and other data, withup to 25 GB per single layered, and 50 GB per dual layered disc. The disc hasthe same physical dimensions as standard DVDs and CDs. The name Blu-ray Disc derives from the blue-violet laser used to read the disc.While a standard DVD uses a 650 nanometer red laser, Blu-ray uses a shorterwavelength, a 405 nm blue-violet laser, and allows for almost six times moredata storage than a DVD. Removable storage Tape drives mainly for backup and long-term storage. Can be connected withSCSI (most common), parallel port, IDE, USB, FireWire or optical fibre. Tapedrives can range in capacity from a few megabytes to upwards of 800 GBcompressed. External CD-RW and hard drive May be used for backup, easy transfer of datato another PC, and are good choices for offsite backup data storage in case offire et..
Thumb drive, flash and SD cards small, lightweight, removable and rewritabledata storage devices. Some recent USB flash drives act as two drives - as aremovable disk device , and as a USB floppy drive. This is likely intended tomake it easier to use them as a bootable device. Hot swappable devices and non-hot swappable devices Hot swapping and hot plugging are terms used to separately describe thefunctions of replacing system components without shutting down the system.Hot swapping describes changing components without significant interruptionto the system, while hot plugging describes changing or adding componentswhich interact with the operating system. Both terms describe the ability toremove and replace components of a computer, while it is operating. For hotswapping once the appropriate software is installed on the computer, a user canplug and unplug the component without rebooting. A well-known example ofthis functionality is the Universal Serial Bus (USB) that allows users to add orremove peripheral components such as a thumb drive, external hard drive,mouse, keyboard, or printer.