Deep implementations of C-SCAN often utilize optimizations to mitigate the "rewind" penalty.
In multiprogramming environments, the disk drive is often the bottleneck of system performance. The physical limitations of magnetic disk drives—specifically seek time (moving the arm to the correct cylinder) and rotational latency—far outweigh the data transfer time. Consequently, the order in which I/O requests are serviced has a profound impact on system throughput and user-perceived latency. d.cscan.o
The SCAN algorithm moves the head back and forth across the disk, servicing requests in the direction of travel. While this drastically reduces seek time, it introduces a geographical bias. Consequently, the order in which I/O requests are
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To understand the depth of C-SCAN, we must model the total head movement ($T_{move}$) and the waiting time ($T_{wait}$).