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| Product | WD My Book VelociRaptor Duo | Promise Pegasus R6 (12TB, SATA II) | Promise Pegasus J4 (2TB) | WD My Book Thunderbolt Duo (4TB) |
| Price | $649.00 to $1,167.01 | $2,291.56 to $2,499.99 | $721.99 to $880.99 | $445.00 to $745.23 |
| CNET editors' rating | 4 stars | 3.5 stars | 3.5 stars | 3.5 stars |
| Average user rating | 0 stars | 3.5 stars | 0 stars | 0 stars |
| Release date | Info unavailable | 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. | If you have a Thunderbolt-enabled computer, the Promise Pegasus R6's storage capacity, its features, and especially its performance are worth the hefty investment for those who demand fast external storage. | The Pegasus J4 is currently the only good choice on the market if you're looking for a compact four-bay Thunderbolt storage device. | 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 R6 - Hard drive array | Promise Pegasus J4 - Hard drive array | WD My Book Thunderbolt Duo WDBUPB0040JSL - Hard drive array |
| Packaged Quantity | 1 | 1 | 1 | 1 |
| Device Type | Hard drive array | Hard drive array | Hard drive array | Hard drive array |
| Total Array Capacity | 2 TB | 12 TB | 2 TB | 4 TB |
| Interface | Thunderbolt | Thunderbolt | Thunderbolt | Thunderbolt |
| Installed Devices / Modules Qty | 2 (installed) / 2 (max) | 6 (installed) / 6 (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 9.8 in | Info unavailable | 3.9 in x 6.2 in x 6.5 in |
| Weight | 4.2 lbs | 13 lbs | 5.3 lbs | 4.9 lbs |
| Localization | Latin America Canada United States | Info unavailable | United States | Latin America United States Canada |
| Storage Controller | RAID - RAID RAID 1 - RAID JBOD - RAID RAID 0 | RAID ( Serial ATA-300 ) - RAID RAID 50 - RAID RAID 1 - RAID RAID 10 - RAID RAID 6 - RAID RAID 5 - RAID RAID 0 | RAID ( Serial ATA-300 ) - RAID RAID 1 - RAID JBOD - RAID RAID 0 | RAID - RAID RAID 1 - RAID JBOD - RAID RAID 0 |
| Storage Controller (2nd) | None | None | Info unavailable | None |
| Hard Drive | 2 x 1 TB Standard | - Thunderbolt technology 6 x 2 TB Hot-swap - Flexible connectivity - RoHS compliant | 4 x 500 GB Standard Serial ATA-300 | - Thunderbolt technology 2 x 2 TB Standard - Double-safe data protection |
| Hard Drive (2nd) | None | None | Info unavailable | None |
| OS Required | Apple MacOS X 10.6.8 or later | Apple MacOS X 10.6.8 or later | Apple MacOS X | Apple MacOS X 10.6.8 or later |
| Manufacturer Warranty | 3 years warranty | 2 years warranty | 2 years warranty | 3 years warranty |
| Full specifications | Full specifications | Full specifications | Full specifications | Full specifications |
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LaCie 5big Thunderbolt compare (20GB)
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