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| Product | Promise Pegasus R6 (12TB, SATA II) | LaCie 5big Thunderbolt (20GB) | Promise Pegasus R4 (4TB) | Promise Pegasus J4 (2TB) | WD My Book VelociRaptor Duo |
| Price | $2,304.75 to $2,499.99 | $2,099.99 to $2,199.95 | $922.90 to $1,887.95 | $699.00 to $839.99 | $599.00 to $1,175.92 |
| CNET editors' rating | 3.5 stars | 4 stars | 3.5 stars | 3.5 stars | 4 stars |
| Average user rating | 3.5 stars | 0 stars | 0 stars | 0 stars | 0 stars |
| Release date | Info unavailable | Info unavailable | Info unavailable | Info unavailable | Info unavailable |
| Bottom line | 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. | Though it lacks RAID 5, the speedy 5big Thunderbolt is still worth the hefty investment, and is a better buy than competing devices. | The Pegasus R4 would be a very good investment for those who have a Thunderbolt-enabled computer, be it Windows PC or
Mac. | 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. |
| Product Description | Promise Pegasus R6 - Hard drive array | Info unavailable | Promise Pegasus R4 - Hard drive array | Promise Pegasus J4 - Hard drive array | WD My Book VelociRaptor Duo WDBUWZ0020JBK - Hard drive array |
| Packaged Quantity | 1 | Info unavailable | 1 | 1 | 1 |
| Device Type | Hard drive array | Info unavailable | Hard drive array | Hard drive array | Hard drive array |
| Total Array Capacity | 12 TB | Info unavailable | 4 TB | 2 TB | 2 TB |
| Interface | Thunderbolt | Info unavailable | Thunderbolt | Thunderbolt | Thunderbolt |
| Installed Devices / Modules Qty | 6 (installed) / 6 (max) | Info unavailable | 4 (installed) / 4 (max) | 4 (installed) / 4 (max) | 2 (installed) / 2 (max) |
| Weight | 13 lbs | Info unavailable | 9.9 lbs | 5.3 lbs | 4.2 lbs |
| Storage Controller | RAID ( Serial ATA-300 ) - RAID RAID 50 - RAID RAID 1 - RAID RAID 10 - RAID RAID 6 - RAID RAID 5 - RAID RAID 0 | Info unavailable | RAID ( Serial ATA-600 ) - RAID RAID 1E - 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 |
| Hard Drive | - Thunderbolt technology 6 x 2 TB Hot-swap - Flexible connectivity - RoHS compliant | Info unavailable | 4 x 1 TB Hot-swap | 4 x 500 GB Standard Serial ATA-300 | 2 x 1 TB Standard |
| OS Required | Apple MacOS X 10.6.8 or later | Info unavailable | Apple MacOS X 10.6 or later | Apple MacOS X | Apple MacOS X 10.6.8 or later |
| Manufacturer Warranty | 2 years warranty | Info unavailable | 2 years warranty | 2 years warranty | 3 years warranty |
| Full specifications | Full specifications | Full specifications | Full specifications | Full specifications | Full specifications |
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Promise Pegasus R6 compare (12TB, SATA II)
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