Note that Windows can't read ext3 partitions, so if you want to read your disk on Windows, you should format as NTFS instea, and you should do that on Windows before you connect the drive in your HDA.<br/>
Remember that using NTFS partitions on Linux will be slower that using ext3 partitions, so you should only use NTFS if you really need it.<br/>
How much slower: compare the blue bars (NTFS-3G) with the red bars (ext3) on [http://www.tuxera.com/products/tuxera-ntfs-commercial/performance/ this graph].<br/>'''Be sure to read the [[Adding_a_second_hard_drive_to_your_HDA#NTFS_partitions|last section about NTFS]] on this page if you use a NTFS partition!'''
There are many easy to follow guides online on how to use GParted. You should Google for one, to find one that seems clear to you.<br/>
That's it. Your new hard drive just increased your Greyhole storage pool capacity.
==NTFS partitions==
For NTFS partitions, you'll need to change the line you add in your /etc/fstab file to make your files readable by others (like the web server, and thus the web applications).
Here's what you need to change (two things), using an example.
If what you added in your /etc/fstab is this:
<div style="border: 1px solid #A3B1BF; padding: .5em 1em; color: #000; background-color: #E6F2FF; margin: 3px 3px 1em 3px;">
UUID=9d972abc-1639-44df-a60e-668618d40236 /var/hda/files <strong style="color:red">ntfs</strong> <strong style="color:blue">defaults</strong> 1 2
</div>
You'll need to change that to this ('''all on one line'''):
<div style="border: 1px solid #A3B1BF; padding: .5em 1em; color: #000; background-color: #E6F2FF; margin: 3px 3px 1em 3px; text-align: left">
UUID=9d972abc-1639-44df-a60e-668618d40236 /var/hda/files <strong style="color:red">ntfs-3g</strong> <strong style="color:blue">defaults,gid=100,fmask=0113,dmask=0002,noatime,rw</strong> 1 2
</div>