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Unformatted text preview: rite transaction for a store operation: movl %eax,A. 6.1. STORAGE TECHNOLOGIES 285 6.1.2 Disk Storage Disks are workhorse storage devices that hold enormous amounts of data, on the order of tens to hundreds of gigabytes, as opposed to the hundreds or thousands of megabytes in a RAM-based memory. However, it takes on the order of milliseconds to read information from a disk, a hundred thousand times longer than from DRAM and a million times longer than from SRAM. Disk Geometry Disks are constructed from platters. Each platter consists of two sides, or surfaces, that are coated with magnetic recording material. A rotating spindle in the center of the platter spins the platter at a fixed rotational rate, typically between 5400 and 15,000 revolutions per minute (RPM). A disk will typically contain one or more of these platters encased in a sealed container. Figure 6.9(a) shows the geometry of a typical disk surface. Each surface consists of a collection of concentric rings called tracks. Each tr...
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This note was uploaded on 09/02/2010 for the course ELECTRICAL 360 taught by Professor Schultz during the Spring '10 term at BYU.

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