storage

1. Objectives Overview

2. Hard Disks

2.1. Hard disks can store data using longitudinal recording or perpendicular recording

2.2. The hard disk arms move the read/write head, which reads items and writes items in the drive

2.3. A head crash occurs when a read/write head touches the surface of a platter

2.4. Always keep a backup of your hard disk

2.5. A disk controller consists of a special-purpose chip and electronic circuits that control the transfer of data, instructions, and information from a disk to and from the system bus and other components of the computer

3. Flash Memory Storage

3.1. Flash memory chips are a type of solid state media and contain no moving parts

3.2. Solid state drives (SSDs) have several advantages over magnetic hard disks:

3.3. A memory card is a removable flash memory device that you insert and remove from a slot in a computer, mobile device, or card reader/writer

3.4. USB flash drives plug into a USB port on a computer or mobile device

3.5. An ExpressCard module is a removable device that fits in an ExpressCard slot

3.6. Developed by the PCMCIA

3.7. Commonly used in notebook computers

4. Video: Thumb Drive (USB Flash Drive) Encryption

5. Cloud Storage

5.1. Cloud storage is an Internet service that provides storage to computer users

6. Optical Discs

6.1. An optical disc consists of a flat, round, portable disc made of metal, plastic, and lacquer that is written and read by a laser

6.2. Typically store software, data, digital photos, movies, and music

6.3. Read only vs. rewritable

6.4. Optical discs commonly store items in a single track that spirals from the center of the disc to the edge

6.5. Track is divided into evenly sized sectors

7. Other Types of Storage

7.1. Tape is a magnetically coated ribbon of plastic capable of storing large amounts of data and information

7.2. A smart card stores data on a thin microprocessor embedded in the card

7.3. A tape drive reads and writes data and information on a tape

7.4. A magnetic stripe card contains a magnetic stripe that stores information

7.5. Microfilm and microfiche store microscopic images of documents on a roll or sheet flim

7.6. Enterprise storage stores huge volumes of data and information for large businesses

7.6.1. Uses special hardware for heavy use, maximum availability, and maximum efficiency

8. Putting It All Together

9. Summary