• Learning Outcomes
• Describe how a disk works
• Given how disks work, identify the key design criteria that file systems might use to maximize performance of the disk system.
• 6.1.2, 6.1.3, 6.1.4
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CPSC 313 1
Extending our View of a Computer System
Execution Cores
Execution Cores
Bus Interface
Host bus adapter
System bus
I/O Bridge
Memory bus
Modern Disk Drives
Disk Heads
Disk Surface
Disk Sector Numbering
CPSC 313 5
Disk Drive Performance
• Speed of a disk drive is a function of: • RPM (7200 – 10,000)
• Size of the device (1.8” – 3.5”)
• Density (bits per track; tracks per inch) 500-600Gbit/in2 Capacity
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