In my testing, the device would dismount when the host computer went into sleep mode, which is expected, and would take somewhere from 15 to 30 seconds to wake up and reconnect by itself once the host awoke. While I was impressed with the RAID support, the Promise Pegasus2 R8's power management could use a little improvement. Other than that, it shares the same kind of port and cable as Thunderbolt and is also backward-compatible with existing Thunderbolt devices.

Note that Thunderbolt 2 is the next generation of Thunderbolt, which offers a 20Gbps connection speed (twice that of Thunderbolt). Other than the black color and the support for Thunderbolt 2, the new Pegasus2 lineup is almost exactly the same as the previous generation. I tested the R8 model, which is very representative of all three. The more drives generally means more storage space and RAID options. The number of drives is the only difference among the three models.

Housing standard SATA desktop hard drives of 2TB, 3TB, or 4TB, the Pegasus2 offers somewhere between 8TB and 32TB, depending on the models. The Pegasus2 family includes three models - the R4, the R6, and the R8 - that can house four, six, and eight internal drives, respectively. The all new Pegasus2 R8 (left) next to the previous generation, the Pegasus R6.

Promise pegasus2 r6 12tb