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VSCAN is a variant of SCAN which varies the elevator's speed dynamically based on system load, offering a compromise between SSTF and SCAN.

Circular SCAN (C-SCAN) moves the head from one end of the disk to the other servicing requests, then jumps back to the beginning and repeats the process.

LOOK moves the head towards the nearest end and processes requests on the way, then reverses direction and does the same, ignoring requests further than the last one in each direction.

The NSS (Next Served Sector) scheduling handles requests by choosing the request with the shortest seek time from the next sector to be serviced.

First Come First Serve (FCFS) processes the requests in the order they arrive in the disk queue.

Circular LOOK (C-LOOK) is similar to LOOK but the head jumps to the opposite end of the queue without servicing requests after hitting the last request in one direction.

SCAN moves the disk arm towards one end servicing all requests until it gets to the end of the disk, then reverses direction.

N-Step-SCAN breaks the disk request queue into subqueues of size N and processes each subqueue using SCAN before moving on.

Shortest Seek Time First (SSTF) selects the request closest to the current head position.