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What is the difference between Western Data Purple Disk 6TB 5640 to 64MB SATA3 (60PURX) and Western Data Purple Disk

The parameters are only for reference, and the products are subject to the local actual sales.

Configuration status - None or unknown
Western Data Purple Disk 6TB 5640 to 64MB SATA3 (WD60PURX)
    Western Data Purple Disk 4TB 64MB SATA3 (WD40PURX)
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            Configuration status - None or unknown
             Western Data Purple Disk 6TB 5640 to 64MB SATA3 (WD60PURX)
             Western Data Purple Disk 4TB 64MB SATA3 (WD40PURX)
            Western Data Purple Disk 6TB 5640 to 64MB SATA3 (WD60PURX)
              Western Data Purple Disk 4TB 64MB SATA3 (WD40PURX)
                Please select the model
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                    Please select the model
                      Model name
                      offer nine hundred and seventy-nine

                      twenty-one Merchants

                      five hundred and thirty-nine

                      twenty Merchants

                      E-commerce on sale
                      comment
                      nine point three

                      sixty-four People comment

                      nine point three

                      sixty-four People comment

                      Basic parameters
                      Applicable type
                      Monitor hard disk
                      Hard disk size
                      Hard disk capacity
                      Number of discs
                      6 pieces
                      4 pieces
                      Single disc capacity
                      cache
                      speed
                      5640rpm
                      Interface type
                      Interface rate
                      6Gb/s
                      6Gb/s
                      performance parameter
                      Performance score
                      three thousand six hundred and fifty-six
                      three thousand five hundred and eighty-nine
                      Other parameters
                      Product size
                      147*101.6*26.1mm
                      Product weight
                      750g