The other day I purchased a Western Digital Thunderbolt DUO drive and did some speed tests and this is what I came up with. The Thunderbolt drive gets about 103 MB/s on read and write in RAID 1 (mirroring) Haven't tried RAID 0 which I assume would be faster. My other Firewire 800 drive gets about 65 MB/s read and write. The internal hard drive on my Mid 2011 iMac (i5 2.7) gets about 98 MB/s. Do these numbers sound correct? Shouldn't the Thunderbolt drive be getting more speed? I was expecting at least 150 MB/s or more. I'm thinking maybe it's because I have it in RAID 1. I was also concerned about the internal hard drive on my iMac. Is that really as fast as that hard drive can perform? Thanks.