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Tutorial 09.pdf

Tutorial 09.pdf - TUTORIAL 9 Overview of Mass-Storage...

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TUTORIAL 9 Overview of Mass-Storage Structure Principles of Operating Systems
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Overview of Mass-Storage Structure Magnetic disks provide bulk of secondary storage of modern computers Transfer rate : rate at which data flow between drive and computer Positioning time (random-access time) : time to move disk arm to desired cylinder (seek time) and time for desired sector to rotate under the disk head (rotational latency) Principles of Operating Systems
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Overview of Mass-Storage Structure Drive attached to computer via I/O bus Busses vary, including IDE, ATA, SATA, USB, Fibre Channel, SCSI, SAS, Firewire Host controller in computer uses bus to talk to disk controller built into drive or storage array Principles of Operating Systems
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Important terms Principles of Operating Systems Streaming Transfer Rate The rate for a data transfer that is underway, excluding the effect of access latency Effective Transfer Rate The ratio of total bytes per total seconds, including overhead time such as access latency Utilization of device The ratio of effective transfer rate to streaming transfer rate
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  • Spring '18
  • Operating Systems, Units of information, Gigabyte, Byte, Rotating disc computer storage media

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