ABB 81EA11D-E GJR2374800R0210

ABB 81EA11D-E GJR2374800R0210 Once the disk read/write head is on the HDD, it reaches the proper location, and the data, subsequent data on the track, can be accessed very quickly. To reduce seek time and rotation delay, data is transferred to or from disk in large contiguous blocks.

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ABB 81EA11D-E GJR2374800R0210 Once the disk read/write head is on the HDD,

it reaches the proper location, and the data, subsequent data on the track, can be accessed

very quickly. To reduce seek time and rotation delay, data is transferred to or from disk in large

contiguous blocks. Sequential or block access on disk is several orders of magnitude faster than

random access, and many complex paradigms have been developed to design efficient algorithms

based on sequential and block access. Another way to reduce I/O bottlenecks is to use multiple disks

in parallel to increase the bandwidth between primary and secondary memory.

ABB 81EA11D-E GJR2374800R0210

Most computer operating systems use conceptual virtual memory, which allows the utilization of more primary storage capacity than is physically available in the system. As main memory fills up, the system copies the least-used blocks (pages) to swap files or page files on secondary memory so that they can be retrieved later if needed. If you move a large number of pages to slower secondary storage, system performance degrades.

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