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9781285161761_Ch08.pptxChapter 8
Digital Storage
Discovering Computers
Technology in a World of Computers, Mobile Devices, and the Internet
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Objectives Overview
Discovering Computers 2014: Chapter 8
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See Page 336
for Detailed Objectives
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Differentiate between storage and memory
Describe the characteristics of internal hard disks
Identify uses of external hard disks and RAID
Describe the benefits of solid-state drives
Differentiate among various types of memory cards and USB flash drives
Objectives Overview
Discovering Computers 2014: Chapter 8
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See Page 336
for Detailed Objectives
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Discuss the benefits and uses of cloud storage
Describe characteristics of and differentiate among types of optical discs
Explain types of enterprise storage
Identify uses of magnetic stripe cards, smart cards, RFID tags, and microfilm and microfiche
Storage
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A storage medium is the physical material on which a computer keeps data, information, programs, and applications
Cloud storage is another storage option, in which the actual online storage media used is transparent to the user
Storage
A storage device is the hardware that records and/or retrieves items to and from storage media
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Reading is the process of transferring items from a storage medium into memory
Writing is the process of transferring items from memory to a storage medium
Storage
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Figure 8-1
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Storage
Capacity is the number of bytes a storage medium can hold
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Table 8-1
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Storage
Items on a storage medium remain intact even when you turn off a computer or mobile device
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Figure 8-2
Storage
Access time measures:
The amount of time it takes a storage device to locate an item on a storage medium
The time required to deliver an item from memory to the processor
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Figure 8-3
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Hard Disks
A hard disk contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information
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Figure 8-4
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Hard Disks
Hard disks can store data using longitudinal recording or perpendicular recording
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Figure 8-5
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Hard Disks
Formatting is the process of dividing the disk into tracks and sectors
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Figure 8-6
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Hard Disks
Characteristics of a hard disk include:
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Tracks
Sectors
Platters
Form factor
Read/write head
Revolutions per minute
Hard Disks
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Figure 8-7
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Hard Disks
A head crash occurs when a read/write head touches the surface of a platter
Always keep a backup of your hard disk
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Figure 8-8
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Hard Disks
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Disk cache, sometimes called a buffer, consists of a memory chip(s) on a hard disk that stores frequently accessed data, instructions, and information
The larger the disk cache, the faster the hard disk
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Hard Disks
RAID (redundant array of independent disks) is a group of two or more integrated hard disks
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Figure 8-9
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Hard Disks
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Figure 8-10
An external hard disk is a separate freestanding storage device that connects with a cable to a USB port or other port on a computer or mobile device
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Flash Memory Storage
Flash memory chips are a type of solid state media and contain no moving parts
An SSD (solid state drive) has several advantages over magnetic hard disks:
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Higher storage capacities
Faster access times
Faster transfer rates
Quieter operation
More durable
Lighter weight
Less power consumption
Less heat generation
Longer life
Flash Memory Storage
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Figure 8-11
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Flash Memory Storage
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
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CF
SDHC
SDXC
miniSD
microSD
microSDHC
microSDXC
xD Picture Card
Memory Stick PRO Duo
M2
Flash Memory Storage
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Figure 8-12
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Flash Memory Storage
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Figure 8-13
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Flash Memory Storage
USB flash drives plug into a USB port on a computer or mobile device
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Figure 8-14
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Cloud Storage
Cloud storage is an Internet service that provides storage to computer or mobile device users
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Optical Discs
An optical disc consists of a flat, round, portable disc made of metal, plastic, and lacquer that is written and read by a laser
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Figure 8-15
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Optical Discs
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Figure 8-16
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Optical Discs
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
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Figure 8-17
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Optical Discs
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A CD-ROM can be read from but not written to
Single-session disc
A CD-R is an optical disc on which users can write once, but not erase
A CD-RW is an erasable multisession disc
Optical Discs
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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
Enterprise Storage
Enterprise hardware allows large organizations to manage and store data and information using devices intended for heavy use, maximum efficiency, and maximum availability
RAID duplicates data, instructions, and information to improve data reliability
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Figure 8-19
Enterprise Storage
Network attached storage (NAS) is a server that is placed on a network with the sole purpose of providing storage to users, computers, and devices attached to the network
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Figure 8-20
Enterprise Storage
A storage area network (SAN) is a high-speed network with the sole purpose of providing storage to other attached servers
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Figure 8-21
Enterprise Storage
Tape is 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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Figure 8-22
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Other Types of Storage
A magnetic stripe card contains a magnetic stripe that stores information
A smart card stores data on an integrated circuit embedded in the card
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Figure 8-24
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Other Types of Storage
The RFID tag consists of an antenna and a memory chip that contains the information to be transmitted via radio waves
An RFID reader reads the radio signal and transfers the information to a computer or computing device
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Figure 8-25
Other Types of Storage
Microfilm and microfiche store microscopic images of documents on a roll or sheet film
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Figure 8-26
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Summary
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Variety of storage options
Storage capacity and storage access times
Characteristics of hard disks, RAID, and external hard drives
Various types of flash memory storage
Advantages and various uses of cloud storage
Characteristics of optical discs
Enterprise storage options
Chapter 8 Complete
Chapter 8
Digital Storage
Discovering Computers
Technology in a World of Computers, Mobile Devices, and the Internet
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