storage

1. A storage device is the hardware that records and/or retrieves items to and from storage media

1.1. Reading

1.1.1. A process of transferring item from a storage medium into memory

1.2. Writing

1.2.1. A process of transferring item from a memory into a storage medium

2. An illustration of volatility

2.1. Its contents are erased when power is removed from a computer or mobile device.

3. Screen display volatile

4. Contents of storage nonvolatile

5. Hard Drives

5.1. A hard disk, also called a hard disk drive (HDD) contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information

5.2. The storage capacity of hard disks varies and is determined by: -The number of platters the hard disk contains -The composition of the magnetic coating -on the platters -Whether the disk uses longitudinal or perpendicular recording Density.

5.3. Characteristics of a hard disk include: Tracks Sectors Platters Form factor Read/write head Revolutions per minute

5.4. SSD (solid state drive)

5.4.1. flash memory storage device that contains its own processor to manage its storage

5.4.2. advantages over traditional (magnetic) hard disks: -Faster access times -Faster transfer rates -Quieter operation -More durable -Lighter weight

5.5. external hard drive

5.5.1. separate freestanding storage device that connects with a cable to a USB port or other port on a computer or mobile device

5.6. RAID

5.6.1. a group of two or more integrated hard drives

6. Cloud Storage

6.1. an Internet service that provides storage to computer or mobile device users

7. Enterprise Storage

7.1. Enterprise hardware allows large organizations to manage and store data and information using devices intended for heavy use, maximum efficiency, and maximum availability

7.2. Network attached storage (NAS)

7.2.1. a server that is placed on a network with the sole purpose of providing storage to users, computers, and devices attached to the network

7.3. storage area network (SAN)

7.3.1. a high-speed network with the sole purpose of providing storage to other attached servers

7.4. Tape

7.4.1. a magnetically coated ribbon of plastic capable of storing large amounts of data and information

8. A storage medium is the physical material on which a computer keeps data, information, programs, and applications

9. Cloud storage keeps information on servers on the Internet, and the actual media on which the files are stored are transparent to the user

10. Contents of most RAM volatile

11. Access time measures

11.1. The amount of time it takes a storage device to locate an item on a storage medium

11.2. The time required to deliver an item from memory to the processor

12. memory

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

12.2. Portable Flash Memory Storage

12.2.1. -microSDXC -CF -xD Picture Card -Memory Stick PRO Duo -M2

13. Optical Discs

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

13.2. -Optical discs commonly store items in a single track that spirals from the center of the disc to the edge of the disc -Track is divided into evenly sized sectors

13.3. A CD-RO -can be read from but not written to Single-session disc A CD-R -an optical disc on which users can write once, but not erase A CD-RW -an erasable multi session disc

14. Other Types of Storage

14.1. A magnetic stripe card has a magnetic stripe that contains information A smart card stores data on an integrated circuit embedded in the card

14.2. The RFID tag consists of an antenna and a memory chip that contains the information to be transmitted via radio waves

14.3. An NFC-enabled device contains an NFC chip An NFC tag contains a chip and an antenna that contains information to be transmitted Most NFC tags are self-adhesive