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| Product | Western Digital My Book Mirror Edition (1TB) | LaCie 2big (4TB, USB 3.0)  | LaCie Rugged USB 3.0 Thunderbolt (1TB) | WD My Book Thunderbolt Duo (4TB) |
| Price | Pricing is currently unavailable. | MSRP: $579.99 | $200.00 to $240.00 | $431.99 to $591.99 |
| CNET editors' rating | 4 stars | 4 stars | 4 stars | 3.5 stars |
| Average user rating | 1.5 stars | 0.5 stars | 0.5 stars | 0 stars |
| Release date | 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. | Fast, flexible, rugged, and affordable, the LaCie Rugged Thunderbolt is one of the best high-end portable drives on the market. | 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 | Info unavailable | WD My Book Thunderbolt Duo WDBUPB0040JSL - Hard drive array |
| Packaged Quantity | 1 | 1 | 1 | 1 |
| Device Type | Hard drive array | Hard drive array | Info unavailable | Hard drive array |
| Total Array Capacity | 1 TB | 4 TB | Info unavailable | 4 TB |
| Interface | Hi-Speed USB | SuperSpeed USB 3.0 | Info unavailable | Thunderbolt |
| Installed Devices / Modules Qty | 2 (installed) / 2 (max) | 2 (installed) / 2 (max) | Info unavailable | 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 | Info unavailable | 3.9 in x 6.2 in x 6.5 in |
| Weight | 5.8 lbs | 7.9 lbs | 9.2 oz | 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 | Info unavailable | RAID - RAID RAID 1 - RAID JBOD - RAID RAID 0 |
| Storage Controller (2nd) | None | None | Info unavailable | None |
| Hard Drive | 1 TB 2 Standard | - Helps to reduce power consumption 2 x 2 TB Hot-swap - PC and Mac compatible | Info unavailable | - Thunderbolt technology 2 x 2 TB Standard - Double-safe data protection |
| Hard Drive (2nd) | None | None | Info unavailable | None |
| 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 | Info unavailable | Apple MacOS X 10.6.8 or later |
| Manufacturer Warranty | 3 years warranty | 3 years warranty | 2 years warranty | 3 years warranty |
| Full specifications | Full specifications | Full specifications | Full specifications | Full specifications |
| Buying choices | Pricing is currently unavailable. | MSRP: $579.99 See manufacturer website for availability. |
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LaCie 2big compare (2TB, USB 3.0)
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