MacDrive software version 9.3.1 is a program that allows users to access and manipulate Mac-formatted disks on a Windows computer. The software provides full support for HFS/HFS+ formatted disks and allows for seamless file transfers between Mac and Windows operating systems. MacDrive also includes features such as disk repair, partitioning, and the ability to create Mac-formatted disks directly from a Windows computer. Additionally, MacDrive 9.3.1 includes performance enhancements and bug fixes to improve overall functionality.