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Western Digital My Book Thunderbolt Duo 4 TB Dual-Drive Storage, WDBUPB0040JSL-NESN (Discontinued by Manufacturer): Amazon.ca: Computers & Tablets
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Western Digital releases My Book external RAID USB-C drives with up to 20TB capacity, more - 9to5Mac
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WD My Book Duo 4TB RAID USB 3.1 (Gen 1 Type-A) 3.5" Desktop External Hard Drive - Gray - Micro Center
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Amazon.com: WD My Book Duo WDBLWE0080JCH - Hard drive array - 8 TB - 2 bays - 2 x 4 TB - USB 3.0 (external): Computers & Accessories
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