Disk Organization

Disk Organization - Disk Organization Disk surface Circular...

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1/31/12 1 Disk Organization Disk surface Circular disk coated with magnetic material Tracks Concentric rings around disk surface, bits laid out serially along each track Sectors Each track is split into arc of track (min unit of transfer) sector
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1/31/12 2 More on Disks CD’s and floppies come individually, but magnetic disks come organized in a disk pack Cylinder Certain track of the platter Disk arm Seek the right cylinder seek a cylinder
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1/31/12 3 Disk Examples ( Summarized Specs ) Seagate Barracuda IBM Ultrastar 72ZX Capacity, Interface & Configuration Formatted Gbytes 28 73.4 Interface Ultra ATA/66 Ultra160 SCSI Platters / Heads 4 / 8 11/22 Bytes per sector 512 512-528 Performance Max Internal transfer rate (Mbytes/sec) 40 53 Max external transfer rate (Mbytes/sec) 66.6 160 Avg Transfer rate( Mbytes/sec) > 15 22.1-37.4 Multisegmented cache (Kbytes) 512 16,384 Average seek, read/write (msec) 8 5.3 Average rotational latency (msec) 4.16 2.99 Spindle speed (RPM) 7,200 10,000
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1/31/12 4 Disk Performance Seek Position heads over cylinder, typically 5.3  8 ms
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