I recently bought a 2011 Mac Mini 2.5GHz 4 GB ram with stock 500 GB HDD. It is running the latest version of Lion, with only 2 applications so far: CCC and Blackmagic Disk Speed Test. I booted and ran fine before putting in the SSD, which is an OWC 120 GB Mercury Electra 6G SSD (just purchased, new). I decided to place the SSD into Mini in addition to the stock HDD. I opened up Mini, swapped out SATA connector and moved HDD to slot furthest from fan (using SATA connector from ifixit mini dual drive kit. SSD was placed in slot closest to fan, using stock SATA connector. Installation was ineventful, nothing broke, everything went back together nicely. I booted up using stock HDD and was able to see the SSD in there. I formatted it and then cloned the HDD to the SSD using CCC. I was able to boot using SSD, boot time being roughly equal to stock HDD actually. For now, I have left the original bootable copy of Lion on the HDD, but start-up is switched to SSD in System Preferences. To test speed of new SSD, using Blackmagic, I get read speeds of 190 MB/s and write speeds of 140 MB/s. This is a far cry from the OWC advertised speeds and some people on here have achieved much faster speeds. Do you think this is an accurate reading? (I tried using AJA Kona, but I can never get this to work for me, on any of my Macs. I press Start and it the button flashes Stop, but then goes right back to Start.) Is there something else that I am missing or is this a defective SSD? Could the Lion boot copy on the stock HDD be interfering in some way?