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Seagate IronWolf Pro 6TB NAS Hard Drive 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive ST6000NE0021 - Newegg.com
Seagate 6TB Enterprise Desktop Hard Disk Drive - 7200 RPM SAS 12Gb/s 128MB 3.5" ST6000NM0054 - Newegg.com