HP Hard Drive is the Refurbished and Tested Hard Drive. Where it has 30 days warranty, 18.2GB Capacity, 10K RPM, size of the hard drive is 3.5 Inch and Interface of the hard drive is SCSI.
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Hitachi Hard Drive is the Refurbished and Tested Hard Drive. Where it has 30 days warranty, 1.3GB Capacity, 3.6K RPM, size of the hard drive is 5.25 Inch and Interface of the hard drive is ESDI.
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