I am back again with a new query regarding disk read and write. While performing a disk read, For eg:- say 1MB of data, speed of read is 50 to 100MB/sec. If i perform a disk writeimmediately followed by disk read, then speed of read is 1000 to 1200MB/sec. Large variation in speed. i.e. if disk read operation is performed alone, speed is very low. if a disk write is done and then immediately read it, then read speed is very high. Is this also issue with cache ?