What reads and writes to Sys.dm_exec_requests DMV SQL Server

According to the explanation given in MSDN at http://msdn.microsoft.com/en-us/library/ms177648.aspx I cannot fully understand the meaning of Reads and Writes. But this is physical or logical or reading and writing to the database. Please help me in this regard.

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The number of physical read / write operations of blocks is 8k. Therefore, if you multiply it by 8, you will get the number of kilobytes that have been read / written.

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