Difficulty in partitioning HD for installing Windows

I am attempting to install windows using bootcamp and windows 8.1.  I have a MB Pro 13inch, no optical drive.  I have made an .iso version on another computer, saved it on my MB pro, plugged in an empty flash drive, 16GB, and continued with bootcamp assistant, and constantly get the message when getting to the partitioning of my HD, that files can't be moved in order to create the partition.  Disk utility says that my HD is the appropriate format (single partition, Mac OS extended (journaled), I have verified the disk, and even reinstalled OS X, then repeated the process of using bootcamp, still with the same error message, that I can't partition the disk and files have to be moved!  How do I get around this one?

1. What year is your Mac? It may or may not support USB installation.
2. You have insufficient contiguous disk space for partitioning to work properly. Backup your OSX installation, use Internet Recovery (OS X: About OS X Recovery - Apple Support) and erase your internal disk, restore from backup and try BCA partitioning again.

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    This question was solved.
    View Solution.

    Tornado7 wrote:
    I wanted to ask
    1. whether we can install a mSATA drive of 60-120 GB in the mSATA slot and use it as the place to install Windows? Would it be like having a dual hard disc setup if windows is installed on the mSATA and the 5400 rpm HDD is formatted? I know this might affect the warranty but still i am curious.
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    4. What is the size of the mSATA drive that would fit in the slot available?
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