SECONDARY STORAGE. -2 Competencies Distinguish between primary & secondary storage Discuss the...
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Transcript of SECONDARY STORAGE. -2 Competencies Distinguish between primary & secondary storage Discuss the...
SECONDARY STORAGE
-2
Competencies
Distinguish between primary & secondary storage
Discuss the different types of storage media
Describe the traditional floppy disk and the high capacity floppy disks
Describe various types of hard disk devices
-3
Competencies cont.
Describe ways to improve hard-disk operations
Describe the different types of optical disks
Describe other kinds of secondary storage devices
-4
Storage
Primary storageVolatile
Temporary
Secondary storageNonvolatile
Permanent
Secondary storage characteristics
Media
Capacity
Storage devices
Access speed
-5
Secondary Storage Devices
-6
Floppy Disks
Diskettes
Floppies
Portable storage media
Floppy disk drives (FDD)
Traditional Floppy Disk
-7
Traditional Floppy Diskette
-8
Types of Floppies
High capacity
Known as a floppy-disk cartridge
Require special disk drives
Three well known typesZip disks
HiFD disks
SuperDisks
-9
Hard Disks
Use thicker, metallic platters for storage
Faster than a floppy diskette
Large capacity
Sensitive instruments
-10
Materials that Cause a Head Crash
-11
Internal Hard Disk
Located inside system unit
Known as a fixed disk
Designated as the C drive
Advantages over floppies
Access speed
Capacity
-12
Hard-Disk Cartridges
Removable hard disks
Used to complement
internal hard disk
Capacities of 10 to 20
GB PC Card Hard Disks
-13
Hard-Disk Packs
Removable
Massive storage capacity
Common in mainframes
Resembles stack of vinyl records
-14
Hard-Disk Pack
-15
Performance Enhancements
Disk caching
Redundant arrays of inexpensive disks (RAID)
File compression and decompression
-16
Optical Disks
Compact
Permanent storage
Laser beams reflect off pits
Two common typesCD
DVD
-17
Compact Disc
Optical format
From 650 MB to 1 GB capacity
Rotation speeds vary
Types Read only: CD-ROM
Write once: CD-R
Rewriteable: CD-RW
Picture CDs and Photo CDs
-18
Digital Versatile Disc
Digital Versatile Disk or Digital Video Disk (DVD)
Similar to CDs, but can store more data
TypesRead only
Write once
Rewritable
-19
DataPlay
Optical disk
Write once format
Quarter size500 MB capacity
Holds 5 hours of CD-quality sound
Use for storing and playing music files
-20
Other Types of Secondary Storage
Solid-state storage
Internet hard drives
Magnetic tape
-21
Solid-State Storage
Flash memory cardsWidely used in notebook computers
Used to record MP3 music files
Key chain hard drives Key chain flash memory devices
Connects to a USB port
-22
Internet Hard Drives
-23
Magnetic Tape
External storage
Provides sequential accessInformation stored in sequence
Slower than disks which provide direct access
Magnetic tape streamers or tape cartridges used by both mainframes and microcomputers
-24
A Look to the FutureBlu-Ray Technology
New standard in storage
Blu-RayNew disks use blue laser light instead of the red laser light used in traditional CD players
Disks may ultimately hold Over 30GB on one-sided disks
Over 50GB on two-sided disks
-25
FAQs
What is the difference between primary storage and secondary storage?
What kinds of floppy disks are available?
What is the C drive of a computer?
When would I use a hard-disk cartridge?
What is the difference between a CD and a DVD?
-26
Discussion Questions
Discuss three ways to improve the performance of hard disks.
Describe the different types of compact discs.
Describe the different types of DVDs.
What are the advantages and disadvantages of using an Internet hard drive?
Describe solid state technology. Discuss the many uses for key chain flash memory devices.