If one runs into an issue where Boot Camp Assistant states that the “startup disk does not have enough space to be partitioned” and that one needs at least 10 GB of free space available even though there is already even more than that, it is possible that there is not enough free space in a single congruent piece on the hard drive, which can happen if the disk is fragmented due to having too little space available for an extended period of time. If one has 160 GB total, this would amount to about 36-52GB of ideal free space being available, of which 16-31 GB would be left to Mac OS X and 20GB would be given to Windows.
HOW TO INSTALL WINDOWS ON MAC DESKTOP FOR MAC OS X
The recommended amount is over 20GB, however, enough to still leave some free space for Mac OS X (ideally 10-20% of total disk space on a Mac partition) and 20GB for the Windows partition. Have at least 10 GB of free disk space available.
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Modern Macs use the same underlying system architecture as Windows PCs.