Windows 7: Need Help making a partition that can be accessed by two OS

Hello,I have a 640gb harddrive and I am making a partition for windows 7 and another partition for Linux.Both are 100 gb.So i have unallocated space of about 400gb.I want to make this a partition that i can access either from winows or from linux.Can someone tell me how to make a partition like this?

You could do it either from Windows or Linux. This is the way I would do it:

1. Install Windows - during installation, allow it to be installed into a new 100GB partition.
2. Install Linux - during installation, allow it to be installed into a new 100GB partition.
3. Boot into Windows. Go to Control Panel --> Administrative Tools --> Computer Management. Right-Click on the free space, and select the option to create a new partition. Make the partition NTFS, format (quick format is OK). Assign drive letter for use within Windows, label partition.
4. When you boot into Linux, this partition will be visible, and usable.

If you chose to do it in Linux, install gparted (if using Ubuntu), and run it. It shows up a graphical interface to create/resize partitions.

Best to the OP's post first.
Want to Shrink C partition into 3 partition but files are preventing

huh???

If you click on the link above, you will see that the OP (thread starter) has already been shown how to achieve what he wants to do.

well actually I needed more help,if you dont want to help then dont help,but just sticking your smug comments in there is not helpfull

If you needed more help, why didn't you ask in the original thread?

If you're not happy with the free, voluntary advice you're getting, feel free to contact the moderators.

That's me done on this one. Have a nice day.

I did reply on the other thread and no one responded,smugness must be a british thing

ive been to many forums and its always the same,you talk down to others