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Western Digital Internal Hard Drive WD5000AAKX 500GB 7200 RPM 16MB Blue 3.5" HDD 718037773421 | eBay
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Western Digital Blue WD5000AAKS 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive - Newegg.com
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Amazon.com: Western Digital WD AV-GP 500GB 32MB Cache SATA 3.0Gb/s 3.5inch (CCTV DVR, PC) Internal Hard Drive (Low power, Quiet) -w/1 Year Warranty : Electronics
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