I turned to Iometer to perform a 2MB sequential access across the first 1TB of the Pegasus R6's RAID-5 array. Without a second Thunderbolt source to copy to the array at closer to the interface's max speed, we had to generate data. That's a peak of nearly 1.8Gbps and we've still got 8.2Gbps left upstream on the PCIe channel. Copying a large video file from the SSD to the Pegasus R6 over Thunderbolt proved this to be true:Īpple's SSD maxed out at 224MB/s to the Thunderbolt array, likely the peak sequential read speed from the SSD itself. But as a relatively modern 3Gbps SSD, this drive should be good for roughly 200MB/s. The model number implies a Toshiba controller and I'll get to its performance characteristics in a separate article. This was the first MacBook Pro I've ever tested with Apple's own SSD, so I was excited to give it a try. The problem is, there's no single drive source that can come close to delivering that sort of bandwidth.Īpple sent over a 15-inch MacBook Pro with a 256GB Apple SSD. With six in a RAID-5 configuration, we should be able to easily hit several Gbps in bandwidth to the Pegasus R6. A single 2TB Hitachi Deskstar 7K3000 is good for sequential transfer rates of up to ~150MB/s.

Pegasus2 r6 drive not mounting