Mine is detecting the HDD as an SSD too.
The motherboard is a Z68X-UD3H-B3 v1.0 and the SATA ports are in AHCI mode.
The HDD is a Hitachi HDT721010SLA360
Its interesting because on the Health tab it has the Rotation rate as 7200 RPM
if you want any more details feel free to contact me. I think if you PM me it will forward me an Email.