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Seagate Enterprise Capacity 3.5'' HDD 4TB 7200 RPM 512n SAS 12Gb/s 128MB Cache Internal Hard Drive ST4000NM0025 - Newegg.com
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Seagate Desktop Solid State Hybrid Drive - 4 TB, 8 GB Flash, 3.5 in, SATA-600, Buffer 64 MB, Internal, OEM Package (ST4000DX001) at TigerDirect.com
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