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Unformatted text preview: Once the seek has occurred, the time spent waiting for the sector to be accesses to appear under the head is called rotational latency time . Average rotational latency time is about half of the time for a full rotation of the disk. (Typical rotational speeds of disks ranges from 60 to 120 rotations per second). The access time is then the sum of the seek time and the latency and ranges from 10 to 40 milli-sec. 2. data transfer rate , the rate at which data can be retrieved from or stored to the disk. Current disk systems support transfer rate from 1 to 5 megabytes per second. 3. reliability , measured by the mean time to failure . The typical mean time to failure of disks today ranges from 30,000 to 800,000 hours (about 3.4 to 91 years)....
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This note was uploaded on 10/25/2010 for the course CMPN SEM4 taught by Professor Thakur during the Spring '07 term at University of Mumbai.
- Spring '07