You won't notice any real-world difference with your drive in SATA 1 mode.
HDDs can be SATA 3 compatible, but they are not SATA 3 capable.
Your drive can transfer the contents of its 32MB buffer at SATA 3 speeds, but that's it.
No HDD can spin fast enough to Read/Write at SATA 3 speeds.
Thanks for the reply.
But I'm want know: how to make the hdd work with my motherboard that can only work in Sata1 mode (PT800CE-A motherboard on VT8237).
For details You be able to see for details http://www.tomshardware.co.uk/forum/243507-14-sata-compatible-sata-ports#t1730541