The memory hierarchy while the cost per megabyte of

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Unformatted text preview: rs and six surfaces, and the tracks on each surface are numbered consistently, then cylinder is the collection of the six instances of track . 286 CHAPTER 6. THE MEMORY HIERARCHY Disk Capacity The maximum number of bits that can be recorded by a disk is known as its maximum capacity, or simply capacity. Disk capacity is determined by the following technology factors: ¯ ¯ ¯ Recording density (bits in): The number of bits that can be squeezed into a one-inch segment of a track. Track density (tracks in): The number of tracks that can be squeezed into a one-inch segment of the radius extending from the center of the platter. Areal density (bits in¾ ): The product of the recording density and the track density. Disk manufacturers work tirelessly to increase areal density (and thus capacity), and this is doubling every few years. The original disks, designed in an age of low areal density, partitioned every track into the same number of sectors, which was determined by the number of sectors that could be recorded on the innerm...
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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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