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NORTHERN EET 450 - Advance Digital

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EET 450 - Advance DigitalCompact Disk TechnologySlide 3Speed comparisonSlide 5CD-Rom DriveSlide 7Slide 8ISO 9660Slide 10CD-R Media ColorSlide 12Slide 13CD-ROM Disc & Drive FormatsSlide 15Slide 16Slide 17DVDSlide 19Slide 20Slide 21Standard DVD FormatsSlide 23Recordable DVD StandardsDVD Ram encodingDVD-RamDVD-R Wobbled GrooveDVD-RMultiRead & MultiRead2ReferencesEET 450 - Advance DigitalChapter 12CD - CDR - DVDCompact 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•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.Speed comparisonCD Drive Speed Data Rate Kbps1x 1504x 60010x 1,50012x 1,80024x 3,60032x 4,80040x 6,00048x 7,200100x 15,000Speed comparisonDrive Speed Access Time (ms)1x 4002x 3003x 2004x 1506x 1508x – 12 x 10016x – 24x 9032x – 52x or greater 85-75 or lessCD-Rom Drive•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 varietyISO 9660CD-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.•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–This solidifies in a non-reflective state–To erase, a lower power laser heats to 200 degrees, which solidifies in the original reflective state.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: CDTVCD-ROM Disc & Drive Formats•White Book–Video CD–MPEG-1, MPEG-2•Orange Book–Writeable CDs – CDR•Green Book–Combination of Red and Yellow Books–CD-I•CD + (Enhanced CD)–Combines Music and computer Data on 1 CD•Data Standard: ISO 9660•High Sierra Format•CD-CA (digital Audio)•CD-ROM XA – extended architecture–Multi-session CDsDVD•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•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•Short wave-length laser reads•fast transfer rate - ~ 9x by CD-Rom standards•interface - standard IDE/ATA or SCSIStandard DVD FormatsFormat Size S/layers CapacityDVD-5 120mm S/s 4.7GDVD-9 120mm S/d 8.5GDVD-10 120mm D/s 9.4GDVD-14 120mm D/d 13.24GDVD-18 120mm D/d 17GDVD-1 80mm S/s 1.4GDVD-2 80mm S/d 2.7GDVDR-1 120mm S/s 2.58GDVDR-2 120mm D/s 9.4G•Recordable DVD–Two standards–DVD-R•WORM type–DVD-RAM•re-writable like CD-RWRecordable 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/diskDVD Ram encodingDVD-RamDVD-R Wobbled GrooveDVD-RMultiRead & MultiRead2Media MultiRead MultiRead2CD-DA (audio) X XCD-ROM X XCD-R X XCD-RW X XDVD-ROM - XDVD-Video - XDVD-Audio - XDVD-Ram - XReferences•http://www.toshiba.com/taecdpd/products/docs/dvdramwhitepaper.shtml•Mueller, S., Upgrading and Maintaining PC’s 12e, 2000, Que


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NORTHERN EET 450 - Advance Digital

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