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I just got a Sandisk Extreme Pro 960GB SSD in the mail. It's second only to the Samsung 850 Pro IMO.

This is with the Seagate GoFlex Portable Thunderbolt cradle with a mid 2012 MacBook Air. It's slightly slower than my tests with the Samsung EVO drive, which is odd b/c this is most definitely a faster drive. It's all negligible of course.

960GB%20Sandisk%20Extreme%20Pro.png
 
For grins, here's a Plextor M3 512GB SSD that I have on hand. This drive was a bit dirty, having just been pulled from a Windows machine and been formatted for OSX. Not sure that matters, but.. <3 Plextor

Plextor%20M3-512.png
 
Sorry for one more huge pic, but I posted the results of the Sandisk 960GB Extreme Pro a bit ago. It was in the Seagate Thunderbolt cradle.

Tonight I installed it in my 2010 Mac Pro using an Apricorn Velocity X2. Here are the results, which are MUCH better.

SandiskInVSolo.png
 
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In the past I had troubles with Crucial M4 SSDs in the larger 500GB sizes on the Seagate Thunderbolt Adapter. This was probably due to the very large power spices this SSD produces while operating which are not present with hard disks which was what this adapter was designed for. Seagate never sold this adapter with SSDs.

However, those older technology SSDs, while power hungry, did have exceptional performance specs. More modern drives that you get today are cheaper, somewhat slower, but have greatly reduced power requirements. I have several Samsung 840 EVO SSDs running from Seagate TB Adapters with no problems.

I think you will be fine with a 850 EVO 500GB SSD on the Seagate Adapter.
 
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