500 gig hard drive showes 127

[simplyme4353]

have had this mother board Asrock M3A770DE 5 days and have worked on it ever day, ever thing works great except the fact that the two 500 gig hard drives only show 127 gigs, been all thru the bios, setup and ever thing else i can find to go into, but it still dont show over the 127 gigs, can some one tell me what i need to do to get this problem solved, G i hope they didnt sell me a old hard drive

thanks
simplyme4353