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| Radius of the innermost track |
| Radius of the outermost track |
| The speed of the read/write head |
| In C-SCAN, the time to backtrack from the outer to the inner track |
| Arrival rate of the requests |
| r.v. denoting radius of the track specified by a memory request |
| pdf for |
| r.v. denoting job size; rotational latency + transfer time for a request |
| pdf for |
| The (large) number of jobs in a hypothetical request sequence |
| The average access time of a job |
| The time access time of label |
| The part of during which the head is moving |
| The part of during which the head is processing a job |
| r.v. denoting the number of jobs in the system not being processed at a random time |
| The load of the system |
| r.v. denoting the remaining time on a job being processed |
| The pdf of the location of the head, given that it is not backtracking |
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