07 External Memory - MetaLab
07 External Memory - MetaLab 07 External Memory - MetaLab
High Definition Optical Disks• Designed for high definition videos• Much higher capacity than DVD▫ Shorter wavelength laser• Blue-violet range▫ Smaller pits• HD-DVD▫ 15GB single side single layer• Blue-ray▫ Data layer closer to laser• Tighter focus, less distortion, smaller pits▫ 25GB on single layer▫ Available read only (BD-ROM), Recordable once (BR-R) and re-recordable (BR-RE)
Magnetic Tape• Tape system use the same reading/writingtechnique as disk system.• Made from polyester tape coated withmagnetizable material.• Serial access• Slow• Very cheap• Backup and archive
- Page 1 and 2: William StallingsComputer Organizat
- Page 3 and 4: Magnetic Disk• Disk - a circular
- Page 5 and 6: Inductive Write MR Read
- Page 7 and 8: Disk Data Layout
- Page 9 and 10: Disk Layout Methods Diagram
- Page 11 and 12: Multiple zone recording (MZR)• To
- Page 13 and 14: Removable or Not• Removable disk
- Page 15 and 16: Multiple Platters
- Page 17 and 18: Classification of disk based on hea
- Page 19 and 20: Disk performance parameters• The
- Page 21 and 22: Optical Storage CD-ROM• Originall
- Page 23 and 24: Continue..• Data on CD/CD-Rom is
- Page 25 and 26: Other Optical Storage• CD-Recorda
- Page 27: DVD - technology• Multi-layer•
High Definition Optical Disks• Designed for high definition videos• Much higher capacity than DVD▫ Shorter wavelength laser• Blue-violet range▫ Smaller pits• HD-DVD▫ 15GB single side single layer• Blue-ray▫ Data layer closer to laser• Tighter focus, less distortion, smaller pits▫ 25GB on single layer▫ Available read only (BD-ROM), Recordable once (BR-R) and re-recordable (BR-RE)
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