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| Product | WD My Book VelociRaptor Duo | Promise Pegasus R4 (4TB) | WD My Book Thunderbolt Duo (6TB) |
| Price | $655.80 to $1,167.01 | $863.50 to $1,854.23 | $529.99 to $861.49 |
| CNET editors' rating | 4 stars | 3.5 stars | 3.5 stars |
| Average user rating | 0 stars | 0 stars | 0 stars |
| Release date | Info unavailable | Info unavailable | Info unavailable |
| Bottom line | 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. | The Pegasus R4 would be a very good investment for those who have a Thunderbolt-enabled computer, be it Windows PC or
Mac. | 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 VelociRaptor Duo WDBUWZ0020JBK - Hard drive array | Promise Pegasus R4 - Hard drive array | WD My Book Thunderbolt Duo WDBUPB0060JSL - Hard drive array |
| Packaged Quantity | 1 | 1 | 1 |
| Device Type | Hard drive array | Hard drive array | Hard drive array |
| Total Array Capacity | 2 TB | 4 TB | 6 TB |
| Interface | Thunderbolt | Thunderbolt | Thunderbolt |
| Installed Devices / Modules Qty | 2 (installed) / 2 (max) | 4 (installed) / 4 (max) | 2 (installed) / 2 (max) |
| Dimensions (WxDxH) | 3.9 in x 6.2 in x 6.5 in | 7.4 in x 9.3 in x 7.7 in | 3.9 in x 6.2 in x 6.5 in |
| Weight | 4.2 lbs | 9.9 lbs | 5.1 lbs |
| Localization | Latin America Canada United States | Info unavailable | Latin America United States Canada |
| Storage Controller | RAID - RAID RAID 1 - RAID JBOD - RAID RAID 0 | RAID ( Serial ATA-600 ) - RAID RAID 1E - RAID RAID 1 - RAID RAID 10 - RAID RAID 6 - RAID RAID 5 - RAID RAID 0 | RAID - RAID RAID 1 - RAID JBOD - RAID RAID 0 |
| Storage Controller (2nd) | None | Info unavailable | None |
| Hard Drive | 2 x 1 TB Standard | 4 x 1 TB Hot-swap | - Thunderbolt technology 2 x 3 TB Standard - Double-safe data protection |
| Hard Drive (2nd) | None | None | None |
| OS Required | Apple MacOS X 10.6.8 or later | Apple MacOS X 10.6 or later | Apple MacOS X 10.6.8 or later |
| Voltage Required | AC 120/230 V ( 47/63 Hz ) | AC 120/230 V ( 50/60 Hz ) | Info unavailable |
| Manufacturer Warranty | 3 years warranty | 2 years warranty | 3 years warranty |
| Full specifications | Full specifications | Full specifications | Full specifications |
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LaCie 5big Thunderbolt compare (10TB)
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