eet 450 - advance digital chapter 12 cd - cdr - dvd
Post on 20-Dec-2015
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EET 450 - Advance Digital
Chapter 12
CD - CDR - DVD
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Compact Disk Technology
• Information stored on a reflective surface, read with a laser beam.
• 74 minutes or 640 Mb of data storage– Current 80 min/700 Mb
• CD-ROM is a read only version.– Data is recorded at manufacture using a
printing-style operation
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• Transfer rates have been increasing – See Table for speeds
• A more important measure is access time.– Massive (relatively) mechanism means slow
response to move the read head into position to read information.
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CD Drive Speed Data Rate Kbps
1x 150
4x 600
10x 1,500
12x 1,800
24x 3,600
32x 4,800
40x 6,000
48x 7,200
100x 15,000
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Drive Speed Access Time (ms)
1x 400
2x 300
3x 200
4x 150
6x 150
8x – 12 x 100
16x – 24x 90
32x – 52x or greater 85-75 or less
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• CD-R - Recordable media
• Same storage capacity, but media uses an organic dye– Some makers now featuring 700Mb (80min)
• The dye reflectivity is changed with a low power laser.– Storage is a WORM variety
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CD-R Media Color
• Reflective layer/Die Layer– Gold-gold – Phthalocyanine dye
• Less tolerance for power variations
– Gold-green – Cyanine dye• More forgiving
• 10 yr life span
– Silver-blue – Azo dye• Similar to green, but rated to 100 years.
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• CD-RW - Re-writable CD
• Uses a phase-change technology
• Same storage capacity as CD
• active layer of CD-RW is Ag-In-Sb-Te– Silver - indium - antimony - tellurium – polycrystalline structure is reflective– High power laser heats to 500-700 degrees
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– This solidifies in a non-reflective state– To erase, a lower power laser heats to 200
degrees, which solidifies in the original reflective state.
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CD-ROM Disc & Drive Formats
• Red Book– Digital Audio CDs (CDDA)
• Yellow Book– Computer CDs– Mode 1: ISO 9660– Level 1: PC, Apple, UNIX, DVI– Level 2: CDTV
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CD-ROM Disc & Drive Formats
• White Book– Video CD– MPEG-1, MPEG-2
• Orange Book– Writeable CDs – CDR
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• Green Book– Combination of Red and Yellow Books– CD-I
• CD + (Enhanced CD)– Combines Music and computer Data on 1 CD
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• Data Standard: ISO 9660
• High Sierra Format
• CD-CA (digital Audio)
• CD-ROM XA – extended architecture– Multi-session CDs
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DVD
• Digital Versatile Disk– initial capacity 4.7 G - 135 minutes of video
with three audio and four sub-title channels.– 8.5 G dual layer disks - use a semi reflective
top layer.– double sided
• 9.4G single layer
• 17G double layer
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• Additional capacity from– smaller pit length– reduced track pitch– larger data area on disk– More efficient modulation– More efficient error correction code– less sector overhead
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• Short wave-length laser reads
• fast transfer rate - ~ 9x by CD-Rom standards
• interface - standard IDE/ATA or SCSI
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Standard DVD FormatsFormat Size S/layers Capacity
DVD-5 120mm S/s 4.7G
DVD-9 120mm S/d 8.5G
DVD-10 120mm D/s 9.4G
DVD-14 120mm D/d 13.24G
DVD-18 120mm D/d 17G
DVD-1 80mm S/s 1.4G
DVD-2 80mm S/d 2.7G
DVDR-1 120mm S/s 2.58G
DVDR-2 120mm D/s 9.4G
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• Recordable DVD– Two standards– DVD-R
• WORM type
– DVD-RAM• re-writable like CD-RW
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Recordable DVD Standards
• DVD-RAM – 2.6 G/side – Not compatible w/ DVD ROM $25/disk
• DVD-R – 4.7G (1999 version)– Almost all can read this format $40/disk
• DVD-RW – 4.7G– Almost all can read this format $40/disk
• DVD+RW – 2.8G/side– A few current from Sony or Phillips $30/disk
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DVD Ram encoding
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DVD-Ram
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DVD-R Wobbled Groove
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DVD-R
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MultiRead & MultiRead2Media MultiRead MultiRead2
CD-DA (audio) X X
CD-ROM X X
CD-R X X
CD-RW X X
DVD-ROM - X
DVD-Video - X
DVD-Audio - X
DVD-Ram - X
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References
• http://www.toshiba.com/taecdpd/products/docs/dvdramwhitepaper.shtml
• Mueller, S., Upgrading and Maintaining PC’s 12e, 2000, Que Corp.