1.0 link Rainbow Dash Network http://rainbowdash.net/ Cloud Kicker (critialcloudkicker) http://rainbowdash.net/critialcloudkicker http://rainbowdash.net/notice/3728435 @<span class="vcard"><a href="http://rainbowdash.net/user/1089" class="url" title="BronieBrown"><span class="fn nickname mention">broniebrown</span></a></span> Basically, there needs to be an MBR on the disk ( this is before partitions come into play ) which allocates maximum adressable storage space. the original technology is called MBR and supports up to 2 TB ( 232 X 512 bytes ). Then GUID partition tables ( GPT ) came along later and has some improvements over the old MBR, such as the ability to support up to 18 Exabytes in size and 128 partitions per disk ( compared to the old MBR format, that only could support 4 primary partitions ( or 3 primary, 1 extended, and unlimited logical ) ... Also there is a greater reliability because of... replication and redundancy check protection of the partition table... ... Which basically translates to &quot;use it when needed, such as when you have a 2TB+ drive or need +4 logical partitions&quot; in my head