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| Product | Western Digital My Book Mirror Edition (1TB) | LaCie 2big (2TB, USB 3.0)  | Western Digital My Book Studio Edition II (2TB) | Western Digital My Book Mirror Edition (2TB) | WD My Book Thunderbolt Duo (4TB) |
| Price | $251.48 | MSRP: $349.99 | $179.00 to $273.88 | $320.68 | $431.99 to $745.23 |
| CNET editors' rating | 4 stars | 4 stars | 3.5 stars | 4 stars | 3.5 stars |
| Average user rating | 1.5 stars | 0.5 stars | 2 stars | 2.5 stars | 0 stars |
| Release date | Info unavailable | Info unavailable | Info unavailable | Info unavailable | Info unavailable |
| Bottom line | The Western Digital My Book Mirror Edition is a compelling choice for an external drive, delivering excellent value, good performance, and two hard drives for added data security. For anyone looking for an external USB 2.0 drive, the My Book Mirror belongs on your shortlist. | The LaCie 2big USB 3.0 is an overall excellent external hard drive. | 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 Western Digital My Book Mirror Edition is a compelling choice for an external drive, delivering excellent value, good performance, and two hard drives for added data security. For anyone looking for an external USB 2.0 drive, the My Book Mirror belongs on your shortlist. | 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. |
| Product Description | WD My Book Mirror Edition WDH2U10000 - Hard drive array | LaCie 2big - Hard drive array | WD My Book Studio Edition II WDH2Q20000 - Hard drive array | WD My Book Mirror Edition WDH2U20000 - Hard drive array | WD My Book Thunderbolt Duo WDBUPB0040JSL - 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 | 1 TB | 2 TB | 2 TB | 2 TB | 4 TB |
| Interface | Hi-Speed USB | SuperSpeed USB 3.0 | Serial ATA-300 Hi-Speed USB FireWire 800 FireWire 400 | Hi-Speed USB | 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 | 3.7 in x 7.2 in x 7.9 in | 3.9 in x 6.1 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 | 5.8 lbs | 7.9 lbs | 5.7 lbs | 5.8 lbs | 4.9 lbs |
| Storage Controller | RAID - RAID RAID 1 - RAID RAID 0 | ( USB 3.0 ) 1 x RAID - RAID RAID 1 - RAID JBOD - RAID RAID 0 | RAID - RAID RAID 1 - 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 | 1 TB 2 Standard | - Helps to reduce power consumption 2 x 1 TB Hot-swap - PC and Mac compatible | USB 2.0 - GreenPower 2 x 1 TB Standard - Automatic power-up - Safe shutdown | 2 TB 2 Standard | - Thunderbolt technology 2 x 2 TB Standard - Double-safe data protection |
| Hard Drive (2nd) | None | None | None | None | None |
| Optical Storage | None | None | None | None | Info unavailable |
| OS Required | Apple MacOS X 10.5.2 or later Apple MacOS X 10.4.11 or later Microsoft Windows Vista / 2000 / XP | Apple MacOS X 10.5 Apple MacOS X 10.6 Microsoft Windows Vista / XP / 7 | Apple MacOS X 10.4.10 or later Apple MacOS X 10.5.2 or later Microsoft Windows Vista / 2000 / XP | Apple MacOS X 10.5.2 or later Apple MacOS X 10.4.11 or later Microsoft Windows Vista / 2000 / XP | Apple MacOS X 10.6.8 or later |
| Manufacturer Warranty | 3 years warranty | 3 years warranty | 5 years warranty | 3 years warranty | 3 years warranty |
| Full specifications | Full specifications | Full specifications | Full specifications | Full specifications | Full specifications |
| Buying choices |
| MSRP: $349.99 See manufacturer website for availability. |
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Western Digital My Book Mirror Edition compare (1TB)
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