I have some free space in my Hard disk and i want to create it as a NTFS partition to able to detect in my Windows XP . I am completely new to Linux/Ubuntu .
Open your terminal and type this
then click at unity dash and type as gparted . it will gives you gparted application icon , click it to open . it will prompt for your root password nothing but login password(if you are singe user ) .
it will display you all the partitions and empty space of your HDD . Now right click at the unallocated/empty space . among the options click at NEW . then it will open the window . give the required size and type of the partition .
look at the image for more information .
control panel, admin tools, then computer management. Storage, disk management option. You can shrink \ partition as you would like. in ubuntu you could use disk utility or fdisk to do this