I'm not sure. When I bought the drive several years ago I only owned that Macbook Pro so it's quite possible I did. What would I need to do to make it recognizable by both? Then it probably formatted as HFS or HFS+ then. There are some free utilities that let you read HFS from windows but not write. OSX can read NTFS but not write. If you plan on regularly moving data back and forth paragon's NTFS on Mac or HFS on windows are highly regarded and fairly cheap.
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Mac OS X won't let you create a FAT32 partition larger than 2TB; so if your drive is larger than that, you'll need to divide the available drive capacity into multiple partitions. Advanced partition management for Mac. All present-day operating systems come with basic partitioning tools that let you format and partition a hard drive. While it may be enough for most people, there are experienced users who would like to have support of non-native file systems, to.
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You only need one. There are a couple of file systems both can read but they don't handle 1Tb very gracefully. Edit: exFAT would work pretty well for you actually. But only if you have windows 7/8 and OSX snow leopard or newer.