Amazon.com: Seagate Barracuda 7200 500 GB 7200RPM SATA 3Gb/s 16MB Cache 3.5 Inch Internal Hard Drive ST3500418AS-Bare Drive : Electronics
Amazon.com: Seagate BarraCuda 500GB Internal Hard Drive HDD – 3.5 Inch SATA 6 Gb/s 7200 RPM 32MB Cache for Computer Desktop PC (ST500DM009) : Electronics
Seagate 500GB BarraCuda SATA 6Gb s 3.5" Internal Hard Drive (ST500DM009)
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Seagate BarraCuda 7200.12 ST3500418AS 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive - Newegg.com