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| Product | Drobo Mini | Drobo (Second generation) | Promise Pegasus R6 (12TB, SATA II) | WD My Book Thunderbolt Duo (6TB) |
| Price | $599.00 to $1,043.67 | $1,010.42 | $2,291.56 to $2,499.99 | $529.99 to $861.49 |
| CNET editors' rating | 2.5 stars | 3 stars | 3.5 stars | 3.5 stars |
| Average user rating | 5 stars | 2.5 stars | 3.5 stars | 0 stars |
| Release date | Info unavailable | Info unavailable | Info unavailable | Info unavailable |
| Bottom line | The esoteric Drobo Mini seems to strive to be unique mostly for the sake of uniqueness, and offers very little, if at all, in terms of usability considering its crazily high cost. | The second-generation Drobo adds a FireWire 800 connection, but the original USB-only on the now discounted Drobo might be the best bet for Windows users until better FireWire 800 drivers arrive. The device remains the most automated and easy-to-use redundant backup product we've seen. | 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 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 | Info unavailable | Data Robotics Drobo DRO4DD10 - Hard drive array | Promise Pegasus R6 - Hard drive array | WD My Book Thunderbolt Duo WDBUPB0060JSL - Hard drive array |
| Packaged Quantity | Info unavailable | 1 | 1 | 1 |
| Device Type | Info unavailable | Hard drive array | Hard drive array | Hard drive array |
| Interface | Info unavailable | Hi-Speed USB FireWire 800 | Thunderbolt | Thunderbolt |
| Installed Devices / Modules Qty | Info unavailable | 0 (installed) / 4 (max) | 6 (installed) / 6 (max) | 2 (installed) / 2 (max) |
| Dimensions (WxDxH) | Info unavailable | 6 in x 10.7 in x 6.3 in | 7.4 in x 9.3 in x 9.8 in | 3.9 in x 6.2 in x 6.5 in |
| Storage Controller | Info unavailable | Serial ATA | RAID ( Serial ATA-300 ) - RAID RAID 50 - 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) | Info unavailable | None | None | None |
| Hard Drive | Info unavailable | Serial ATA-I - BeyondRAID technology 0 x 0 GB Hot-swap Serial ATA-II - Drive reordering - Mixed drive capacity utilization - Self-healing - Status lights - Email warnings - Storage pooling - Storage virtualization | - Thunderbolt technology 6 x 2 TB Hot-swap - Flexible connectivity - RoHS compliant | - Thunderbolt technology 2 x 3 TB Standard - Double-safe data protection |
| Hard Drive (2nd) | Info unavailable | None | None | None |
| Manufacturer Warranty | Info unavailable | 1 year warranty | 2 years warranty | 3 years warranty |
| Full specifications | Full specifications | Full specifications | Full specifications | Full specifications |
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