Then right click on cmd.exe and run as administrator. To open the Command Prompt on a Windows Vista or Windows 7 machine click on Start and type cmd in the search bar. Important: note the Disk number (such as Disk 1). The properties window shows that the partition table on the drive is MBR. Look for the drive that is identified as the 3TB drive (2794GB).Select Disk Management (listed under Storage).(If you are on Windows 8 or 8.1 move your mouse to the bottom left hand corner of the desktop screen and right click. From the Start menu right click on Computer which will provide a drop down menu.To determine the disk number assigned to the 3TB+ MBR partitioned drive follow the steps below.For more information regarding drives over 2TB and GPT/MBR partition tables please see the following articles.However, this article also applies to any scenario where a Diskpart Erase of an entire disk is necessary.

This article covers Diskpart Erasing a 3TB or larger drive that has a Master Boot Record (MBR) Partition table, which is thereby limiting its capacity to 2TB.This command takes only a few minutes to complete. This article will walk through the steps of using the Microsoft Diskpart Erase utility to Clean the disk of a previous partition and format, including any data on the drive.Remove all additional drives from the computer excluding the drive you are booting from and the drive you want to Erase/Clean.Please make certain that you are erasing the correct disk. Diskpart Erase/Clean will permanently erase/destroy all data on the selected drive.Please read all steps, instructions, and warnings before attempting the Diskpart Erase/Clean.Cleaning or erasing a storage device removes all data and partitions from the drive. In this article 'Clean' and erase are used interchangeably. The command that erases the drive during this process is 'Clean'. This article explains the Microsoft Diskpart Erase utility.Be sure to back up any important data on this drive before proceeding. Disclaimer: Seagate Technology, LLC is not responsible for lost user data.

Clearing a hard drive