Windows 7 - Best way to partition a hard drive with windows 7

Hi guys i have just setup my computer with the windows 7 on its own hard drive and all my data on a seperate hard drive.
My question is whats the best way to partition this second hard drive, i dont want to loose the data on it if possible.
I know it can be done in the computer managment with shrink volume, but i dont understable the numbers i would like to shrink one partition to approx 250 gb to store my documents and then leave the rest as a 500 Gb drive.

i have tried Acronis disk director but i had to reformat the drive after as it trashed the drive.

i have attached a screen shot of the shrink volume dialog box

Can someone please help me.

Take look here:

Disk - Clean and Clean All with Diskpart Command
Partition or Volume - Delete
Partition or Volume - Create New

Thanks fo the info but i am still not sure what i should reduce the numbers to in the (Enter the amount of space to shrink in MB)

The way would be with NO DATA on HD, I do my HD 50/50.

Ok thank you for your advice

This may help to create your Data Partition: Data Partition The rest is arithmetic.

Hi sam49

WHS video is very good, do take a look.

Thanks for the video thats very good.

For the size itself, target size in GB X 1024.

So if you want a 250GB partition ..
250 X 1024= 256000 MB

Thank you all guys