If you need to mount Mac formatted RAID sets on your PC or create ISO Mac images in Windows, then the Pro version will be necessary. For me, the Standard version was more than enough. You can see the difference between the two versions here. The Standard version is $49 and the Pro version is $69. If you find yourself having to copy data back and forth between Macs and PCs fairly often, this program is a great investment. You can then disconnect the drive from Windows, plug it into your Mac and access everything normally. Using the program, you can read and write data to HFS+ drives just like a normal Windows formatted drive. MacDrive is a great program that allows you to use Mac formatted disks on your Windows PC like a normal drive. If you use Macs and PCs heavily in your setup, it might be worth spending some money on a program called MacDrive. So are there any other options? Well, thankfully yes. Another solution is to enable file sharing on your Mac and access files from Windows that way, but this requires a decent amount of setup.