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Question: Is it compatible with The Seagate GoFlex 1T?
Document: I got this adapter to use with a Seagate Freeagent Goflex drive that I used to use with a USB 2.0 connection. I popped the USB Adapter off the drive, inserted this new Thunderbold adapter and was able to connect to my new MacBook Pro with no problem. The performance of the drive is now unbelievably fast. I would highly recommend this device.
I have a GoFlex drive with the USB 2.0 adapter that's a few years old. It still works like a charm so I detached the drive from the USB 2 SATA interface and snapped it onto the Thunderbolt interface in a few seconds. The only slight issue was that there was a slight gap between the bottom of the drive and the adapter base leading me to believe the newer Seagate drives may be designed to fit better.
Yesterday I got the Seagate Thunderbolt adapter for BACKUP PLUS PORTABLE DRIVES. The box clearly states this works with BACKUP PLUS or GoFlex portable drives. And certainly works with a couple of old portable Backup Plus drives I had around. Problem is... The two new Backup Plus drives I bought have ONLY a USB 3 plug... Not the adapter style plug. Very disappointed!
I no longer see the portable GoFlex USB 3 adapter for sale and it appears that all of the newer Seagate Backup Plus drives have USB 3.0 built in and can be snapped onto faster interfaces like Thunderbolt, so the older GoFlex drives are obsolete. Thunderbolt is a fast technology but the current pricing of cables and adapters is ridiculous. There is no Thunderbolt cable included so I had to borrow the one from my desktop Thunderbolt drive until I buy an extra.
Fortunately my husband has a compatible external portable HD  so the only thing I needed was the cable. Since I am definitely not a techie type, I wasn't sure how trouble free this configuration was going to be. As it turned out, there was no reason to be concerned. Attached to my Mac, this was a big GO from start to finish.
I'm sorry for the title of my review. This is a great product, unfortunately I had to wait a little longer to test it because I was not aware that this adapter did not include the cable. Also, just in case you are wondering, this is NOT a harddrive, it will not work on it's own, it's pretty much useless if you do not currently own or are planning to purchase a compatible harddrive to go with it.
I'm sure this device works great with 2.5&#34; drives, but I wasn't able to test it out on one. I purchased this portable adapter to transfer data off of my 3.5&#34; drives... only to find out they're not compatible. The description needs to be updated to reflect 2.5&#34; drives only.
Works very well with a Samsung 840 (not pro) SSD on a retina MacBook Pro. But somehow the benchmark shows only about 220M/s read, not quite SATA3 6Gbps fast. Since the SSD is 6Gbps capable and thunderbolt is not the bottle neck, maybe the adapter is only SATA2 3Gbps compatible?I also used with with 2 hard drives, no complains there.
Using a GoFlex HDD, USB 2 on a MBPNo speed increase, and the adapter was so sensitive that barely touching the drive would cause it to improperly eject or fail to be recognized altogether, Returning immediately.
Also, if you have multiple devices that will be connected, USB3 can not do what thunderbolt is  capable of. In general I would say to look over both and determine which is going to be a better fit.In the end if you have a goflex portable drive and neeed thunderbolt, this will be a great add-on for you.
Answer: yes