Lecture note Computer Organization - Part 2.2: The computer system
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Lecture note Computer Organization - Part 2.2: The computer system
External Memory6.1Magnetic DiskMagnetic Read and Write Mechanisms Data Organization and Formatting Physical CharacteristicsDisk Performance Parameters Lecture note Computer Organization - Part 2.2: The computer systems6.2RaidRAID Level 0RAID Level IRAID Level 2RAID Level 3RAID Level 4RAID Level 5RAID Level 663 Optical MemoryCompact Disk Digital Versatile DiskHigh-Definition Optical Disks6.4Magnetic Tape6.5Recommended Reading and Web Sites6.6Key Terms. Review Questions, and Problems184This chapter examines a rang Lecture note Computer Organization - Part 2.2: The computer systeme of external memory devices and systems. We begin with the most important device, the magnetic disk. .Magnetic disks arc the foundation of ex- tcmalLecture note Computer Organization - Part 2.2: The computer system
memory on virtually all computer systems. The next section examines the use of disk arrays to achieve greater performance, looking specifically at theExternal Memory6.1Magnetic DiskMagnetic Read and Write Mechanisms Data Organization and Formatting Physical CharacteristicsDisk Performance Parameters Lecture note Computer Organization - Part 2.2: The computer systemcal memory, and this is examined in the third section. Finally, magnetic tape is described.A disk is a circular platter constructed of nonmagnetic material, called the substrate, coated with a magnetizable material. Traditionally, the substrate has been an alu- minum or aluminum alloy material. More Lecture note Computer Organization - Part 2.2: The computer system recently, glass substrates have been intro- duccd. The glass substrate has a number of benefits, including the following:•Improvement in the uniformiLecture note Computer Organization - Part 2.2: The computer system
ty of the magnetic film surface to increase disk reliability•A significant reduction in overall surface defects to help reduce read-write errors•AbiliExternal Memory6.1Magnetic DiskMagnetic Read and Write Mechanisms Data Organization and Formatting Physical CharacteristicsDisk Performance Parameters Lecture note Computer Organization - Part 2.2: The computer systemc Read and Write MechanismsData are recorded on and later retrieved from the disk via a conducting coil named the head: in many systems, there are two heads, a read head and a write head.During a read or write operation, the head is stationary while the platter rotates beneath it. The write mechanis Lecture note Computer Organization - Part 2.2: The computer systemm exploits the fact that electricity flowing through a coil produces a magnetic field. Electric pulses are sent to the write head, and the resultingMaLecture note Computer Organization - Part 2.2: The computer system
gnetizationMR sensorShieldRead currentWrite currentInductive write elementRecording mediumExternal Memory6.1Magnetic DiskMagnetic Read and Write Mechanisms Data Organization and Formatting Physical CharacteristicsDisk Performance ParametersExternal Memory6.1Magnetic DiskMagnetic Read and Write Mechanisms Data Organization and Formatting Physical CharacteristicsDisk Performance ParametersGọi ngay
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