EASEUS Partition Master Professional is an all-in-one drive partition solution and disk management utility on this page. .html' title='R4 Revolution Sdhc Software'>R4 Revolution Sdhc Software. . It allows you to extend partition, especially for system drive, settle low disk space problem, manage disk space easily.. The most common partition problem for computer users is that the Windows system partition runs out of space, the Windows system partition needs to be expanded. But for most users, changing partition structure requires Windows operating system reinstallation and format. The built-in partition manager function of EASEUS Partition Master is right to meet the need.