cant write HD in ubuntu!!!

ok im new to linux....
i have two HD on comp.one has xp and other has ubuntu breezy badger.
wen i boot from ubuntu i cant write in my windows partitions tho i can resd them...it says no write permission...now how can i modify the permission so as to make changes in windows partition??

Create a Root Password:
-------------------------------
$ sudo passwd root
(Enter Password)
(Enter Password)
Password not echoed!!

Now login as Root:
--------------------------
$ su -
(Enter password)

If it's a Text file load gedit
$ gedit ->Open the file & save it to XP partition.
Other files use the Copy (cp) or move (mv) command
First your XP partitions must be mounted!!
$ cp <path> <destination>
For eg.,
$ cp -R /home/raja/Docs /mnt/win_d
This copies all files & folder in the Docs folder in /home/raja to D drive

Move files eg.,
$ mv /home/raja/Docs /mnt/win_d
This moves the entire directory Docs (& subdirectories) to D drive.
Note:
--------
You must have mounted your D drive in /mnt/win_d!!

Now logout from Root account
$ exit
If you use Mandriva Linux 2006, reading , writing to NTFS is child's play!!
Ubuntu needs some refinements in this regard.

M

If the drive is NTFS you will need some tools to write to the drive.
I have tried NTFS-captive for the purpose. It did write. But, sometime write operation terminated partially. Also, the write speed was too slow. To write anything more than 100MB is a big pain. You can very well have a nap in the meanwhile if you don't have a good PC.

yeah its a ntfs partition.the files aint big....for eg.i wanted to replace shell32.dll by the tweaked one..i couldnt do it....i havent tried jguru's trick yet!

M

You won't be able to write without some external tool. First you will need to install such a tool. Then follow what JGuru is saying.

which tool???

M

@romeo, ntfs-captive or any other, if there is.