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Hard disk data transfer rate , data rate

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In case of disk, while doing questions , we have to find the data transfer rate . We do by how much data can be read in 1 rotation  depending on whether there is 1read write head or more than 1.

Sometimes , we are given the data rate . Depending on which we try to find  time to read particular section of data.

What is difference between data transfer rate and data rate given?

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