07 External Memory - MetaLab
07 External Memory - MetaLab 07 External Memory - MetaLab
Continue..• The third one is the aerodynamic gap- winchester• The head must generate or sense an electromagneticfield of sufficient magnitude to write/read properly.• Winchester heads are used in sealed drive – free ofcontamination – able to reduce the risk of error• They are designed to operate closer to the disk’ssurface than conventional rigid disk heads allowinggreater data density.• The head is an aerodynamic foil that rests lightly onthe platter’s surface when the disk is motionless.
Disk performance parameters• The actual details of disk I/O operation dependon computer system, the OS and the nature ofthe I/O channel and disk controller hardware.• Fig. 6.7 – show general timing of disk I/Otransfer.
- 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: Classification of disk based on hea
- 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 and 28: DVD - technology• Multi-layer•
- Page 29 and 30: Magnetic Tape• Tape system use th
Continue..• The third one is the aerodynamic gap- winchester• The head must generate or sense an electromagneticfield of sufficient magnitude to write/read properly.• Winchester heads are used in sealed drive – free ofcontamination – able to reduce the risk of error• They are designed to operate closer to the disk’ssurface than conventional rigid disk heads allowinggreater data density.• The head is an aerodynamic foil that rests lightly onthe platter’s surface when the disk is motionless.
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