ThinkPad T61P (6460-D8G) - which SATA interface?

Question

Hello,
I'd like to add a second hard disk to my ThinkPad T61P (model 6460-D8G). I came up with a couple of possibilities;
1) Hitachi Travelstar 7K320 160gb  (model HTS723216L9A360)
 * this drive has an SATA 3GB/s interface !!!
2) Hitachi Travelstar 7K200 160gb (model HTS722016K9SA00)
 * this has an SATA 1.5 GB/s interface, and is exactly the same model as the primary hard disk I already have.
These two disks are of the same physical size. 
Now, I quess the most important question here is; does my ThinkPad support the #1 drive? In other words, does this computer have an SATA 3GB/s interface? This bit of information I haven't been able to find anywhere?!
If this ThinkPad model does NOT have SATA 3GB interface, will I still be able to connect a SATA 3GB drive to it, or should I just buy the slower SATA 1.5GB model? 
Btw, does the Serial ATA Hard Drive Bay Adapter (model 40Y8725) also support SATA 3GB? If this computer supports SATA 3GB, can I connect the #1 drive to the adapter, or should I swap the disks so that the primary disk goes to bay adapter and the new drive replaces the primary disk inside the computer?
Sorry if my english is not very fluent, but could someone still try and help me out here, as I just can't seem to find the answers anywhere myself...
Achie
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Answer 1

Ok, thank you for your reply, wjli2.
I quess that solves the problem then. I can use which ever of those two drives I can get first, but will not benefit from the faster interface in drive #1.
Too bad my retailer estimated I may have to wait for about 4 weeks to get my hands on one of those . I quess others have also found those two to be good drives.
Archie