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Which statement is valid for the SCAN algorithm Which statement is valid for the SCAN algorithm the read / write head moves till the highest

Which statement is valid for the SCAN algorithm
Which statement is valid for the SCAN algorithm
the read/write head moves till the highest and lowest number of cylinder data request
the read/write head read/write data only in one direction
this algorithm can provide uniform waiting time
the read/write head moves till the inner and outermost cylinders even though there is no data request

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