E0262 – MIS – Multimedia Storage Techniques SMIL – Synchronized Multimedia Integration Language.
Storage and Multimedia: The Facts and More Chapter 6.
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Transcript of Storage and Multimedia: The Facts and More Chapter 6.
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Storage and Multimedia: The Facts and More
Chapter 6
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Secondary Storage Device
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Secondary Storage Benefits
Semi-permanent Non-volatileReliableConvenient – Locate and access data
quickly
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Secondary Storage Benefits
Compressed storage Diskette – about 500 printed pages Optical disk – about 500 books
Economy Savings in physical storage costs Savings in the speed and convenience of filing
and retrieving data
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Types of Storage Magnetic Disk Storage Optical Disks
CD-ROM CD-R CD-RW DVD-ROM Blu-ray
Magnetic Tape Storage Flash Drive
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Magnetic Disk StorageData represented as magnetic spots
Magnetized spot = 1 Absence of a magnetized spot = 0
Read Converts the magnetized data to
electrical impulsesWrite
Converts electrical impulses to magnetized spots on disk
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Diskettes
Low capacity – small files
PortableFlexible Mylar coated
with metallic substanceHard plastic jacket for
protection3 ½ inch, 1.44 MB
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Hard Disk
Various sizes Portability
Generally non-portable Removable hard disks available for PC Portable hard disk is gaining popularity
Rigid platter coated with metallic substance
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Disk Pack
Several plattersAirtight, sealed module
Mount disk pack on disk drive
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Logical Layout of a DiskTrack
Concentric circlesPasses under read/write head as disk
rotates1.44 MB diskette has 80 tracks on each
surfaceEach track stores the same amount of
data
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Logical Layout of a DiskSector
Pie-shaped division of track
Holds a fixed number of bytes (512 bytes)
• Cluster– Adjacent sectors treated as a unit of
storage– Fixed number (2-8 sectors)– Minimum space allocated to a file
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Logical Layout of a DiskZone Recording
• Assigns more sectors to tracks in outer zones
• More sectors = more data storage available
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Disk DriveRead / Write Operation
Disks rotate Access arm moves
read/write head Read / write operation
begins and continues until complete
Data is transferred to/from memory
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Optical DiskGreater capacity
than other portable media
Process Laser writes on
metallic material spread over the surface of disk
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CD-ROMCompact Disk Read-Only Memory
High capacity portableRead multiple timesCannot recordCapacity – up to 680 MB (450
standard 3 ½ inch diskettes)Used for software
distribution
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CD-RCompact Disc-Recordable
High capacityPortableWrite onceRead multiple times
CD-R drive CD-ROM drive
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CR-RWCompact Disk-Rewritable
High capacityPortableRead multiple timesRecord multiple timesSome compatibility problems reading
CD-RW disks on CD-ROM drives
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DVD-ROMDigital Versatile Disk
Larger capacity than CD-ROM Standard – Up to 4.7 GB, 7 times more
than CD-ROM Double layers – 8.5 GB Double-sided – 17 GB
Data is packed more denselyRead multiple times, Cannot recordCan read CD-ROM disks
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DVD-ROMDigital Versatile Disk
Benefits Full-length movies Audio quality comparable to audio
compact disks High-volume business data
Expected to replace CD-ROM in the near future
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Blu-ray Disc Developed by the Blu-
ray Disc Association (BDA)
BDA includes company like Apple, Dell, Sony etc
Developed to enable recording, rewriting and playback of high-definition video (HD)
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Blu-ray Disc
DVD, DVD±R, DVD±RW, and DVD-RAM rely on a red laser
Blu-ray use blue violate laser Benefits:
Average disc holds 25GB/50GB. Advance BRD has storage capacity up to
500GB on a single disc by using 20 layers
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Magnetic Tape Storage Plastic tape with magnetic
coating Magnetic tape unit
Read/write head Erase head erases previously
recorded data Inferior to disks
Not as reliable Sequential access to data
Inexpensive Primarily for backup
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Flash Drive USB flash drives are
removable and rewritable reads and writes to flash memory.
They are a solid-state storage medium that's both inexpensive and durable.
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Flash Drive (Contd.)
Currently, USB 2.0 flash drives on the market are able to reach a data transfer speed of 480 Mbit/s and
USB 3.0 has transmission speeds of up to 5 Gbit/s.
More commonly used sizes vary from 2 Gigabytes -16 Gigabytes.