4.Basic Storage4.Basic Storage

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Basic storage units have problems dealing with Basic storage units have problems dealing with large multimedia data large multimedia data

Single Hard Drives - SCSI/IDE Drives. So called Single Hard Drives - SCSI/IDE Drives. So called AVAV (Audio-Visual) drives, which avoid thermal (Audio-Visual) drives, which avoid thermal recalibration between read/writes, are suitable recalibration between read/writes, are suitable for desktop multimedia. New drives are fast for desktop multimedia. New drives are fast enough for direct to disk audio and video enough for direct to disk audio and video capture. But not adequate for capture. But not adequate for commercial/professional Multimedia. Employed commercial/professional Multimedia. Employed in RAID architecturesin RAID architectures

Removable Media - Jaz/Zip Drives, CD-ROM, Removable Media - Jaz/Zip Drives, CD-ROM, DVD. Conventional (dying out?) floppies not DVD. Conventional (dying out?) floppies not adequate due 1.4 Mb capacity. Other media adequate due 1.4 Mb capacity. Other media usually ok for backup but usually suffer from usually ok for backup but usually suffer from worse performance than single hard drives. worse performance than single hard drives.

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RAID -- Redundant Array of RAID -- Redundant Array of Inexpensive Disks Inexpensive Disks

Developed to fulfil the needs of current multimediaDeveloped to fulfil the needs of current multimedia Offers some significant advantages as a storage medium:Offers some significant advantages as a storage medium:

- Affordable alternative to mass storage - Affordable alternative to mass storage - High throughput and reliability - High throughput and reliability

The key components of a RAID System are: The key components of a RAID System are: - Set of disk drives, disk arrays, viewed by user as one or - Set of disk drives, disk arrays, viewed by user as one or

more logical drives more logical drives - Data may be distributed across drives - Data may be distributed across drives - Redundancy added in order to allow for disk failure- Redundancy added in order to allow for disk failure

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Optical Storage Optical Storage

Optical storage has been the most popular Optical storage has been the most popular storage medium in the multimedia context storage medium in the multimedia context due its compact size, high density recording, due its compact size, high density recording, easy handling and low cost per MB. easy handling and low cost per MB.

CD is the most common. Laser disc and CD is the most common. Laser disc and recently DVD are also popular. recently DVD are also popular.

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CD Storage CD Storage

1.1. CD-DA (Compact Disc-Digital Audio), or CD-DA (Compact Disc-Digital Audio), or standard music CDs.standard music CDs.

2.2. CD-DA moved onto CD-ROM when people CD-DA moved onto CD-ROM when people realized that you could store a whole bunch of realized that you could store a whole bunch of computer data on a 12cm optical disk (700mb). computer data on a 12cm optical disk (700mb).

3.3. CD-I (Compact Disc-Interactive) came next, CD-I (Compact Disc-Interactive) came next, plugs directly into a TV and stereo system.plugs directly into a TV and stereo system.

4.4. CD-ROM/XA (eXtended Architecture) came next.CD-ROM/XA (eXtended Architecture) came next.

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DVD DVD

Digital Video/Versatile DiscDigital Video/Versatile Disc, the next generation , the next generation of optical disc storage technology. of optical disc storage technology.

DVD a major new medium for a whole host of DVD a major new medium for a whole host of multimedia system: multimedia system:

It's essentially a bigger, faster CD that can hold video as It's essentially a bigger, faster CD that can hold video as well as audio and computer data. DVD aims to encompass well as audio and computer data. DVD aims to encompass home entertainment, computers, and business information home entertainment, computers, and business information with a single digital format, eventually replacing audio CD, with a single digital format, eventually replacing audio CD, videotape, laserdisc, CD-ROM, and perhaps even video videotape, laserdisc, CD-ROM, and perhaps even video game cartridges. game cartridges.