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Refurbished: WD6400AAKS-40H2B1 - Western Digital Caviar Blue 640GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive - Newegg.com
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Amazon.com: Western Digital Caviar Blue 640 GB Bulk/OEM Hard Drive 3.5 Inch, 16 MB Cache, 7200 RPM SATA II WD6400AAKS : Electronics
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