The disk storage requirement of LiveCycle is fairly high – see here. Once LiveCycle is installed, configured and integrated, there might be things you can do to minimize disk storage requirements.
The first step is determining which file(s) or folder(s) are taking up large amounts of storage. WinDirStat is excellent in this regard – it provides a visual map of disk usage which lets you quickly focus on the biggest culprits. Thanks to Steven Fukes of Adobe partner Ensemble Systems for introducing us to this nifty little tool.