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First thing I'd try is going into Settings, Applications, Manage Applications, Running. Have a look if there's any app there that could be feasibly accessing your second partition, Force Close it, then try again.

@thanawat:
What program are you using to partition your SD Card [screen shots 1 & 3 above] is it gedit?
I had this prob on a cheap card.
I then bought a 100% genuine sandisk and now it works ok.

I tried to force stop every app that show in running(some app can't stop) and run Link2SD again but it's show the same![]()
Yes, I use Gparted to do partitioning SD card (I know you know this app, just type wrong name)
If you have a terminal installed [and are rooted] you can find out if any processes are accessing your SD Card by using busybox lsof followed by the partition you are interested in eg: busybox lsof /sdcard1.

...
tried this but cannot use this lsof![]()
Have you confirmed your card is the full stated capacity yet?
Which computer OS do you use?
Sometimes, just doing the basics correct from the start often works best.