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| Product | Western Digital My Book Studio Edition II (6TB) | WD My Book Thunderbolt Duo (6TB) | WD My Book Thunderbolt Duo (4TB) | Western Digital My Book Studio Edition II (2TB) | WD My Book VelociRaptor Duo |
| Price | $469.99 to $649.99 | $549.00 to $880.64 | $499.00 to $749.12 | $279.89 to $349.69 | $599.00 to $1,175.92 |
| CNET editors' rating | 3.5 stars | 3.5 stars | 3.5 stars | 3.5 stars | 4 stars |
| Average user rating | 4.5 stars | 0 stars | 0 stars | 2 stars | 0 stars |
| Release date | Info unavailable | Info unavailable | Info unavailable | Info unavailable | Info unavailable |
| Bottom line | The My Book Studio Edition II makes a decent direct-attached storage solution for those who need to extend a computer's storage space or want a large backup drive. The drive's rather buggy firmware might turn many users away, however. | The WD My Book Thunderbolt Duo makes a very good external storage device for Thunderbolt-enabled Macs thanks to its comparative affordability, ease of use, and decent performance. | The WD My Book Thunderbolt Duo makes a very good external storage device for Thunderbolt-enabled Macs thanks to its comparative affordability, ease of use, and decent performance. | The My Book Studio Edition II makes a decent direct-attached storage solution for those who need to extend a computer's storage space or want a large backup drive. The drive's rather buggy firmware might turn many users away, however. | The My Book VelociRaptor Duo is one of the best storage devices thanks to its balanced combination of excellent performance, practical design, and relatively friendly pricing. |
| Product Description | WD My Book Studio Edition II WDH2Q60000 - Hard drive array | WD My Book Thunderbolt Duo WDBUPB0060JSL - Hard drive array | WD My Book Thunderbolt Duo WDBUPB0040JSL - Hard drive array | WD My Book Studio Edition II WDH2Q20000 - Hard drive array | WD My Book VelociRaptor Duo WDBUWZ0020JBK - Hard drive array |
| Packaged Quantity | 1 | 1 | 1 | 1 | 1 |
| Device Type | Hard drive array | Hard drive array | Hard drive array | Hard drive array | Hard drive array |
| Total Array Capacity | 6 TB | 6 TB | 4 TB | 2 TB | 2 TB |
| Interface | Serial ATA-300 Hi-Speed USB FireWire 800 FireWire 400 | Thunderbolt | Thunderbolt | Serial ATA-300 Hi-Speed USB FireWire 800 FireWire 400 | Thunderbolt |
| Installed Devices / Modules Qty | 2 (installed) / 2 (max) | 2 (installed) / 2 (max) | 2 (installed) / 2 (max) | 2 (installed) / 2 (max) | 2 (installed) / 2 (max) |
| Dimensions (WxDxH) | 3.9 in x 6.1 in x 6.5 in | 3.9 in x 6.2 in x 6.5 in | 3.9 in x 6.2 in x 6.5 in | 3.9 in x 6.1 in x 6.5 in | 3.9 in x 6.2 in x 6.5 in |
| Weight | 5.7 lbs | 5.1 lbs | 4.9 lbs | 5.7 lbs | 4.2 lbs |
| Localization | Latin America Canada United States | Latin America United States Canada | Latin America United States Canada | Latin America Canada United States | Latin America Canada United States |
| Storage Controller | RAID - RAID RAID 1 - RAID RAID 0 | RAID - RAID RAID 1 - RAID JBOD - RAID RAID 0 | RAID - RAID RAID 1 - RAID JBOD - RAID RAID 0 | RAID - RAID RAID 1 - RAID RAID 0 | RAID - RAID RAID 1 - RAID JBOD - RAID RAID 0 |
| Storage Controller (2nd) | None | None | None | None | None |
| Hard Drive | 2 x 3 TB Standard | - Thunderbolt technology 2 x 3 TB Standard - Double-safe data protection | - Thunderbolt technology 2 x 2 TB Standard - Double-safe data protection | USB 2.0 - GreenPower 2 x 1 TB Standard - Automatic power-up - Safe shutdown | 2 x 1 TB Standard |
| Hard Drive (2nd) | None | None | None | None | None |
| OS Required | Apple MacOS X 10.5 Microsoft Windows Vista / 7 Apple MacOS X 10.6 | Apple MacOS X 10.6.8 or later | Apple MacOS X 10.6.8 or later | Apple MacOS X 10.4.10 or later Apple MacOS X 10.5.2 or later Microsoft Windows Vista / 2000 / XP | Apple MacOS X 10.6.8 or later |
| Manufacturer Warranty | 5 years warranty | 3 years warranty | 3 years warranty | 5 years warranty | 3 years warranty |
| Full specifications | Full specifications | Full specifications | Full specifications | Full specifications | Full specifications |
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Western Digital My Book Studio Edition II compare (6TB)
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