why copying take too long from my server to External drive

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http://serverfault.com – I Do n't understand why copying data size of 244 GB From window server could be copying at the rate of 10.49KB/sec. The server ram is 48 GB,Processor :2.19GHZ and hard drive of 1.75TB out which 491GB is free. Am coying sqlserver backup files, using super copier.Did any one know what could be the problem or cause of this.Am coying this file locally not over a network (HowTos)