Motherboard GA-M68MT-S2 SATA 3?

has the gigabyte motherboard GA-M68MT-S2 got SATA 3?

Nahh, but unless your using ssds that support sata 3, you dont need it yet.

so your saying this HDD wont work  http://www.amazon.co.uk/Seagate-Barracuda-500GB-Internal-Drive/dp/B005F306RY/ref=wl_it_dp_o_pC_nS_nC?ie=UTF8&colid=21BCD5CJWWY27&coliid=I2CGYXOL9LHNUX

It will work.

sata drives are backwards compatible, and forwards as well, i think.

You are correct :P

i dont understand?

It will work but it will be at SATA 2 speeds, which for a HDD it won't really affect performance.

im recording 720p 1080p videos? onto this dedicated HDD