EASEUS Partition Master 12 is comprehensive hard disk partition tool and system optimization software for Windows-based administration without data loss. Both basic and advanced partition operations can be done by this partition software. It is provided to optimize the performance of server or non-server machines including latest Windows 8.1 by extending the system partition. EaseUS Partition Master Professional Edition is an ALL-IN-ONE partition solution and disk management utility. It allows you to extend partition, especially for system drive, settle low disk space problem, manage disk space easily on MBR and GUID partition table (GPT) disk under 32-bit and 64-bit Windows.