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| Product | Promise Pegasus R4 (4TB) | Promise Pegasus R6 (12TB, SATA II) | LaCie 5big Thunderbolt (10TB) | LaCie 2big Thunderbolt Series (6TB) | WD My Book VelociRaptor Duo |
| Price | $863.50 to $1,854.23 | $2,291.56 to $2,499.99 | $1,079.99 to $1,200.99 | $669.00 to $1,297.98 | $655.80 to $1,167.01 |
| CNET editors' rating | 3.5 stars | 3.5 stars | 4 stars | 3.5 stars | 4 stars |
| Average user rating | 0 stars | 3.5 stars | 0 stars | 5 stars | 0 stars |
| Release date | Info unavailable | Info unavailable | Info unavailable | Info unavailable | Info unavailable |
| Bottom line | The Pegasus R4 would be a very good investment for those who have a Thunderbolt-enabled computer, be it Windows PC or
Mac. | 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 LaCie 2big Thunderbolt Series strikes a balance between capacity, performance, and price and would be a good choice for owners of Thunderbolt-enabled computers. | 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 R4 - Hard drive array | Promise Pegasus R6 - Hard drive array | LaCie 5big Thunderbolt Series - Hard drive array | LaCie 2big Thunderbolt Series - Hard drive array | WD My Book VelociRaptor Duo WDBUWZ0020JBK - Hard drive array |
| Packaged Quantity | 1 | 1 | 1 | 1 | 1 |
| Device Type | Hard drive array | Hard drive array | Hard drive array | Hard drive array | Hard drive array |
| Total Array Capacity | 4 TB | 12 TB | 10 TB | 6 TB | 2 TB |
| Interface | Thunderbolt | Thunderbolt | Thunderbolt | Thunderbolt | Thunderbolt |
| Installed Devices / Modules Qty | 4 (installed) / 4 (max) | 6 (installed) / 6 (max) | 5 (installed) / 5 (max) | 2 (installed) / 2 (max) | 2 (installed) / 2 (max) |
| Dimensions (WxDxH) | 7.4 in x 9.3 in x 7.7 in | 7.4 in x 9.3 in x 9.8 in | 6.8 in x 7.7 in x 8.7 in | 3.6 in x 7.9 in x 6.8 in | 3.9 in x 6.2 in x 6.5 in |
| Weight | 9.9 lbs | 13 lbs | 16.8 lbs | 6 lbs | 4.2 lbs |
| Storage Controller | 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 50 - RAID RAID 1 - RAID RAID 10 - RAID RAID 6 - RAID RAID 5 - RAID RAID 0 | RAID ( Serial ATA-600 ) - RAID RAID 1 - RAID JBOD - RAID RAID 0 | ( Thunderbolt ) RAID - RAID RAID 1 - RAID JBOD - RAID RAID 0 | RAID - RAID RAID 1 - RAID JBOD - RAID RAID 0 |
| Hard Drive | 4 x 1 TB Hot-swap | - Thunderbolt technology 6 x 2 TB Hot-swap - Flexible connectivity - RoHS compliant | 5 x 2 TB Hot-swap | - Portable 2 x 3 TB Hot-swap - Thunderbolt technology - Dual cooling system - Aluminum enclosure | 2 x 1 TB Standard |
| Hard Drive (2nd) | None | None | None | None | None |
| OS Required | Apple MacOS X 10.6 or later | Apple MacOS X 10.6.8 or later | Apple MacOS X 10.6 or later | Apple MacOS X 10.6 or later | Apple MacOS X 10.6.8 or later |
| Voltage Required | AC 120/230 V ( 50/60 Hz ) | AC 120/230 V ( 50/60 Hz ) | AC 120/230 V ( 50/60 Hz ) | Info unavailable | AC 120/230 V ( 47/63 Hz ) |
| Manufacturer Warranty | 2 years warranty | 2 years warranty | 3 years warranty | 3 years warranty | 3 years warranty |
| Storage Controller (2nd) | Info unavailable | None | None | None | None |
| Full specifications | Full specifications | Full specifications | Full specifications | Full specifications | Full specifications |
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| Prices from 14 stores |
Promise Pegasus R4 compare (4TB)
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