Disk geometry disks are constructed from platters

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Unformatted text preview: between the CPU and main memory, and show you how to use your understanding of locality and caching to make your programs run faster. 275 276 CHAPTER 6. THE MEMORY HIERARCHY 6.1 Storage Technologies Much of the success of computer technology stems from the tremendous progress in storage technology. Early computers had a few kilobytes of random-access memory. The earliest IBM PCs didn’t even have a hard disk. That changed with the introduction of the IBM PC-XT in 1982, with its 10-megabyte disk. By the year 2000, typical machines had 1000 times as much disk storage and the ratio was increasing by a factor of 10 every two or three years. 6.1.1 Random-Access Memory Random-access memory (RAM) comes in two varieties—static and dynamic. Static RAM (SRAM) is faster and significantly more expensive than Dynamic RAM (DRAM). SRAM is used for cache memories, both on and off the CPU chip. DRAM is used for the main memory plus the frame buffer of a graphics system. Typically, a desktop system w...
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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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