This is the best of the best, get thunderbolt speed and USB 3.0 in a versatile package.  These are very sought after.  The hard drive itself can be opened up and you can swap in an SSD if you want, with an SSD it will give speeds of about 400 megs per second using the Thunderbolt adapter.  The current drive is limited to about 133 MB per second, still very fast!  I am including a USB 3.0 adapter, a USB 2.0 adapter and the Thunderbolt adapter.  All adapters have cables included.  There are also two cases to hold everything.  To top it all off, I went with everything black, so this is like the Darth Vader of hard drives!  I am including Priority Mail Shipping and insurance.  Thanks for looking, returns accepted, buy with confidence!

STAE128 STAE121 SRD0001 Thunderbolt adapter for Seagate GoFlex portable 2.5" hard drives.  Make your older Mac with USB 2.0 ports transfer at USB 3.0 speeds. People are using these for blackmagic cameras to transfer video to the computer. 

Seagate backup plus thunderbolt adaptor   (STAE128)

Thunderbolt technology is a revolutionary interface supporting high-resolution display and high-performance data devices through a single port. At 10Gbps, Thunderbolt technology is up to 20x faster than USB 2.0 and up to 12x faster than FireWire 800. Transferring high-definition movies and other large files now can take seconds versus minutes when compared with older interface technologies. Taking advantage of the Backup Plus and USM design, the Seagate Thunderbolt adapter turns any Backup Plus Portable drive into a blazing-fast Thunderbolt device for your compatible computer. This portable solution allows you to take it with you everywhere you go, as it is completely bus powered, meaning you do not need an external power supply. Connect it to the end of a daisy chain of Thunderbolt devices, or directly to the Thunderbolt port on your computer. With the help of Thunderbolt technology and compatible peripherals, users can turn their everyday computer into a powerful workstation. System Requirements: Backup Plus or GoFlex Portable drive, Mac OS X operating system 10.6.8 or higher.