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CHAPTER 4: SECONDARY STORAGE, (g) Enterprise Storage, (h) Other Types of…
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(g) Enterprise Storage
RAID
- Duplicates data, instructions and information to improve data reliability.
Network Attached Storage (NAS)
- A server that is placed on a network with the sole purpose of providing storage to users, computers and devices attached to the network.
Storage Area Network (SAN)
- A high-speed network with the sole purpose of providing storage to other attached servers.
Tape
- A magnetically coated ribbon of plastic capable of storing large amounts of data and information.
- A tape drive reads and writes data and information on a tape.
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(a) Storage
Holds data, instructions and information for future use.
Storage medium
The physical material on which a computer keeps data, instructions, and information.
Secondary storage
- Provides permanent or non-volatile storage.
- Items on a storage medium remain intact even when you turn off a computer or mobile device.
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(c) Solid-state Storage
Solid-state memory contains no moving parts. Data and information are stored and retrieved electronically.
Solid-state drives
- Faster and more durable than hard disks.
- Access to slash memory or solid state storage .
Flash memory cards
- Widely used in laptops, smartphones, GPS navigation systems.
USB flash drives (or Flash Drives)
- Connect to USB port.
- Capacity of 1 GB to 256 GB.
- Portable.
(e) Optical Disks
An optical disc consists of a flat, round, portable disc made of metal, plastic and lacquer that is written and read by a laser.
- A CD-ROM can be read from but not written to.
- A CD-RW is an erasable multisession disc.
- A CD-R is an optical disc on which users can write once, but not erase.
- A DVD-ROM is a high-capacity optical disc on which users can read but not write on or erase.
- A DVD-R or DVD+R are competing DVD-recordable WORM formats, on which users can write once but not erase.
- DVD-RW, DVD+RW, and DVD+RAM are high-capacity rewritable DVD formats.
Use reflected light to represent data
- Lands represent 1s and 0s on the disc.
- Pits are bumpy areas on the disc that, when light is reflected, determine the 1s and 0s.
- Use tracks and sectors to organize and store files but only use a single track unlike the hard drive.
(f) Mass Storage Device
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Devices include:
- File servers
- Networked attached storage ((NAS)
- Raid systems
- Organizational cloud storage
(i) Careers in IT
Disaster recovery specialists are responsible for recovering systems and data after a disaster strokes.
General employer requirements:
- Bachelors or associates degree in computer science or information systems
- Experience in the field and skills in networking, security and DBA
- Communication and skills and be able to handle high-stress situations
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(b) Hard disk
A hard disk contains one or more inflexible, circular platters that use magnetic particles to store data, instructions and information.
Internal hard disk
- Located inside the system unit.
- Fast access to retrieve large quantities of information.
- Cannot be easily removed from the system unit.
External hard disks
- Slower access.
- Usually connected to a USB or Thunderbold port on the system unit.
- Easily removed.
(d) Cloud Storage
Cloud Storage is an Internet service that provides storage to computer or mobile device users.
Supplied by servers that provide cloud storage or online storage.
Advantages of cloud storage:
- Access file from computer.
- Store large files instantaneously.
- Allow others to access their files.
- View time-critical data and images immediately.
- Store offsite backups.
- Provide data center functions.
Disadvantages of cloud storage:
- Access speed.
- File security.
(j) A Look to The Future
At some point, hard drives will no longer be able to keep up.
- Looking at ways of increasing capacity without increasing size.
- Currently hard drive maxes out at 128 GB per square inch.
- New technologies may advance this 6.25 TG (6,250 GB) per square inch.
Storage device
- The computer hardware that records and/or retrieves items to and from storage media.
- Involves two processes:
(i) Reading the process of transferring items from a storage medium into memory.
(ii) Writing is the process of transferring items from memory to a storage medium.