Hi, In Win7 and Windows Server 2008, a 100MB partition is created for backup/restore purposes and labelled 'System Reserved Volume'. This partition has been created on a 12TB MBR drive I wish to make use of, but I can only take advantage of 2TB unless I switch the drive to GPT. In order to switch the drive to GPT, I first need to either move, or delete the 100MB partition from my 12TB drive. I have one other 600GB drive in the box, which has a single partition containing my C: drive, and is the primary Windows partition. This advice has not worked for me: Ed's System Admin Blog: Removing the 100MB System Reserved Partition from Server 2008 R2 or Win7 (the partition is still not available to delete after the steps mentioned) and this hack is not applicable as I've already installed the OS: Hack to Remove 100 MB System Reserved Partition When Installing Windows 7 Any further advice much appreciated.