Windows 7: usb 3.0 Transfer Speed Very Slow

I've done alot of reading about transfer rate with 2.0 and 3.0. For 2.0 it's 480 MB/s and for 3.0 it's 5 GB/s. Copying a 2GB item from computer to external HHD. Using 3.0 port on my notebook on test 1 it's around 34MB/s and then on test 2 the speed might be 3.57MB/s, and then on test 3, it's around 36MB/s and when the file size get's smaller, the speed starts to slow down. Why can't I get my 5GB/s?

Your speed is limited by the slowest link in the chain. The external hard drive in the enclosure at best can only do 133MB/s if its IDE. Thats the theoretical maximum, real world speed is more like 100MB/s or even less if its only an ATA-100 drive. You won't even come close to the USB 2 max speed.
EDIT: A SATA drive will be faster but still won't come close to the full USB 3 speed. My SATA 300 drive maxes out at around 150MB/s.

I've enclosed an attachment of what my hard drive specs are. So what is the top speed I should get? The enclosure one is a Seagate 2TB 3.0

For SATA II 3.0 GB/s is the maximum theoretical speed. What you get in real life is less than that. What you get for a sustained read speed depends on the drive and what features it supports. My internal SATA II drive gets about 124 MB/s sustained speed and bursts of around 153 MB/s. Its a Western Digital Blue drive.