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gparted will read only (Ubuntu installed)

Heya,

I'm trying to set up my Inspiron 700m to dual-boot both Ubuntu Dapper Drake and Windows XP. Never having used gparted before, I'm at a loss to figure a way around this:

root@cylien:/home/pewterhydra# gparted
Warning: Unable to open /dev/hdc read-write (Read-only file system).  /dev/hdc h as been opened read-only.
Error: Unable to open /dev/hdc - unrecognised disk label.
root@cylien:/home/pewterhydra#


... in order to create a new partition to install Windows on. Can anyone help me out? Why won't it write? The hard drive in question has an Ultra DMA/ATA-33 interface, if that matters. I read that certain sector sizes aren't supported by gparted, but I have no idea how to find out if that is the problem.
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princess_of_reason
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princess_of_reason
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rindiCommented:
The partitions you manipulate with gparted shouldn't be mounted. I suggest you use a liveCD with QtParted or gparted on it. Knoppix is one such liveCD. If you boot with that the partition isn't opened and so QtPArted should work. QtParted is the GUI frontend to gparted, by the way.

http://knoppix.net

(probably the LiveCD version of Ubuntu also includes gparted and QtParted, but I'm not absolutely sure).
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ppfoongCommented:

rindi is right. The partition to be resized should not be mounted and in use during the resizing process.

You can also get the LiveCD of GPartED here:

http://gparted.sourceforge.net/livecd.php

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princess_of_reasonAuthor Commented:
Thank you rindi (and you too ppfoong.) Rindi was right on all accounts. I suppose that detail is rather intuitive, but somehow it escaped me. *blush*

Success.
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rindiCommented:
Your welcome
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