Disk access Time , Seek time , Latency & RPM : HDD access Time , Seek time (the time that head moves on plates to find and read address of place that data have been written there or to find a vacant space to write data , Latency : in each plate rotation only once the track will be placed under head to read or write data the time that head should wait to plate rotate to  placing track under head called latency or rotational delay  & RPM : revolutionary per minute when you wana buy HDD you have to choose a higher RPM HDD to have a best performance ,   in this video we are going to learn about hard disk access time which is include seek time , latency , transfer time and RPM all of this issues explained in below video practically on a real hard disk drive to better understanding .

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