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| Product | Promise Pegasus J4 (2TB) | WD My Book VelociRaptor Duo | WD My Book Thunderbolt Duo (6TB) | Drobo |
| Price | $721.99 to $880.99 | $649.00 to $1,167.01 | $529.99 to $861.49 | Pricing is currently unavailable. |
| CNET editors' rating | 3.5 stars | 4 stars | 3.5 stars | Info unavailable |
| Average user rating | 0 stars | 0 stars | 0 stars | 2.5 stars |
| Release date | Info unavailable | Info unavailable | Info unavailable | Info unavailable |
| Bottom line | 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 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 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. | Info unavailable |
| Product Description | Promise Pegasus J4 - Hard drive array | WD My Book VelociRaptor Duo WDBUWZ0020JBK - Hard drive array | WD My Book Thunderbolt Duo WDBUPB0060JSL - Hard drive array | Info unavailable |
| Packaged Quantity | 1 | 1 | 1 | Info unavailable |
| Device Type | Hard drive array | Hard drive array | Hard drive array | Info unavailable |
| Total Array Capacity | 2 TB | 2 TB | 6 TB | Info unavailable |
| Interface | Thunderbolt | Thunderbolt | Thunderbolt | Info unavailable |
| Installed Devices / Modules Qty | 4 (installed) / 4 (max) | 2 (installed) / 2 (max) | 2 (installed) / 2 (max) | Info unavailable |
| Weight | 5.3 lbs | 4.2 lbs | 5.1 lbs | Info unavailable |
| Localization | United States | Latin America Canada United States | Latin America United States Canada | Info unavailable |
| Storage Controller | RAID ( Serial ATA-300 ) - RAID RAID 1 - RAID JBOD - RAID RAID 0 | RAID - RAID RAID 1 - RAID JBOD - RAID RAID 0 | RAID - RAID RAID 1 - RAID JBOD - RAID RAID 0 | Info unavailable |
| Hard Drive | 4 x 500 GB Standard Serial ATA-300 | 2 x 1 TB Standard | - Thunderbolt technology 2 x 3 TB Standard - Double-safe data protection | Info unavailable |
| OS Required | Apple MacOS X | Apple MacOS X 10.6.8 or later | Apple MacOS X 10.6.8 or later | Info unavailable |
| Manufacturer Warranty | 2 years warranty | 3 years warranty | 3 years warranty | Info unavailable |
| Full specifications | Full specifications | Full specifications | Full specifications | Full specifications |
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| Pricing is currently unavailable. |
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