07 External Memory - MetaLab

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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

07 External Memory - MetaLab

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