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CHAPTER 7 Storage Katie Moody
Storage • Storage holds data, instructions, and information for future use. • Every computer uses storage to hold software.
Storage Terms • A storage medium is the physical material on which a computer keeps data, instructions, and information (i. e) Zip disks, hard disks, CDs, DVDs etc…). • Capacity is the number of bytes (characters) a storage medium can hold. • A storage device is the computer hardware that records and/or retrieves items to and from storage media.
Storage Terms continued… • Writing is the process of transferring data instructions, and information from memory to a storage medium • Reading is the process of transferring these items from a storage medium into memory. • Access time measures the amount of time it takes a storage device to locate an item on a storage medium, or the time required to deliver an item from memory to processor.
Floppy Disks • A floppy disk, also called a diskette, is a portable, inexpensive storage medium that consists of a think, circular, flexible plastic Mylar film with a magnetic coating enclosed in a squareshaped plastic shell.
Floppy Disk Drives • A floppy disk drive is a device that reads from and writes on a floppy disk. A user inserts a floppy disk into and removes it from the floppy disk drive.
ZIP Disks • A ZIP disk is a type of portable magnetic media that can store from 100 MB to 750 MB of data. • A larger capacity Zip disk can hold about 500 times more than a standard floppy disk.
Hard Disks • A hard disk is a storage device that contains one or more inflexible, circular platters that store data, instructions, and information.
Types of Hard Disks • External Hard Disk • Removable Hard Disk - a separate freestanding hard disk that connects with a cable to a USB port on the system unit. - a hard disk that you insert and remove from a hard drive. • Advantages of External and Removable Hard Disks
Hard Disk Controllers
Internet Hard Drives • A service on the web that provides storage to computer users, usually for a minimal fee. • Reasons for Use: – – – Access files on the internet Saves time Allows others to access files View data immediately Store offsite backup for data
CDs and DVDs • Types of optical storage media • Primarily store software, movies, pictures, and music • Can be read only or have read/write capabilities.
-The drive designation of a CD or DVD drive usually follows alphabetically after that of all the hard disks and portable disks. -Are not magnetic media, rather they are optical media, in which information is stored in microscopic pits created by lasers. -Properly cared for CDs and DVDs are guaranteed to last five years.
CD-ROMs (Compact disc read-only memory) • Type of optical disk that uses laser technology to store data. • Can contain audio, text, graphics, and video. • To read items stored on a CD-ROM, insert the disc into a CDROM drive
DVD-ROMs (Digital Versatile disc-ROM) • An extremely high capacity optical disk capable of storing 4. 7 GB to 14 GB. • Goal is to meet the needs f home entertainment , computer usage, and business data with the use of a single medium.
Tapes and PC Cards • Tapes are magnetically • PC cards are thin coated ribbon of credit-card sized plastic capable of devices that add storing large amounts additional storage, of data at a low cost. memory, and other capabilities. • Used in tape drives.
Miniature Mobile Storage Media • • PDA’s Digital Cameras Music Players Smart Phones
Smart Cards • Similar to the size of a credit card or an ATM card, it stores data on a thin microprocessor embedded in the card. • Popular uses include pre-paid telephones, digital cash, and storage of health care information.
Microfilm - a 100 -215 foot roll of film Microfiche - a small sheet of film, usually about 4 inches by 6 inches. Libraries use these media to store back issues of newspapers, magazines, and genealogy records.