If you are not able to read the speed written physically on the drive, I suggest you use SIW tool to get all the info about HDD.
You can also undergo full system diagnosis from SIW.
*i142.photobucket.com/albums/r116/kiran_rkk/Miscellaneous/hddspeed.jpg
Read review of things you can do with it & also download the tool.
REVIEW: SIW System tool <A good tool you ever need>