For the disk described in the Figure below, consider a workload consisting of 500 read requests, each of a randomly chosen sector on disk, assuming that the disk head is on the outside track and that requests are serviced in P-CSCAN order from outside to inside. How long will servicing these requests take?

\begin{tabular}{ll} \hline Size & \\ Platters/Heads & 2/4 \\ Capacity & 320GB \\ Performance & \\ Spindle speed & 7200RPM \\ Average seek time read/write & 10.5ms/12.0ms \\ Maximum seek time & 19ms \\ Track-to-track seek time & 1ms \\ Transfer rate (surface to buffer) & 54128MB/s \\ Transfer rate (buffer to host) & 375MB/s \\ Buffer memory & 16MB \\ Power & \\ Typical & 16.35W \\ Idle & 11.68W \\ \hline \end{tabular}