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Internal storage: WD Red 3TB NAS HDD $100 shipped (Orig. $155), Toshiba 5TB HDD $150 shipped (Orig. $290)
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Amazon.com: Western Digital 10TB WD Red Pro NAS Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR, 256 MB Cache, 3.5" - WD101KFBX (Old Version) : Electronics
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Seagate IronWolf Pro 12TB NAS Hard Drive 7200 RPM 256MB Cache CMR SATA 6.0Gb/s 3.5" Internal HDD ST12000NE0008 - Newegg.com
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Seagate Ironwolf Pro 16 Tb | Seagate Ironwolf Pro 20tb | Seagate Ironwolf Pro 16tb - Portable Hard Drives - Aliexpress
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