Partitioning and Formatting USB Hard Drive

I'm using a FreeAgent USB hard drive on my system, but placed a lot of files on it before realizing that Mac can't write to an NTFS file system. I've got about 35 GB of files on a 250GB drive. So, two questions:
1. Is there something I can use to partition the drive and format part of it to FAT32 and part of it to the Mac format (realizing that I won't be able to read the Mac formatted partition in Windows).
2. Is it possible to partition the drive without removing the files that are now on it and reformatting (obviously leaving part of it as NTFS)?
I'll probably be able to do 1, but just thought I'd ask about 2 for information purposes.
Thanks,

I suppose I could just format it FAT, but I have some vague notion that the Mac format will work better with the Mac OS, especially for backing up. I'd primarily use the Mac partition for backup, and for storage of video files that just take up too much space on the MacBook internal HD. Don't know how realistic that is, and I'm also not sure which backup program would be best suited. I'm pretty new to the Mac environment, and am not even all that sure whether to keep the *.dmg files that I've used to install several programs that I purchased for the Mac.

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              1 2.66 GHz Intel Core 2 Duo CPU: 2 cores
              4 GB RAM
    Video Information:
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    Disk Information:
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                        EFI (disk0s1) <not mounted>: 209.7 MB
                        Macintosh HD (disk0s2) / [Startup]: 639.28 GB (230.87 GB free)
                        Recovery HD (disk0s3) <not mounted>: 650 MB
              PIONEER DVD-RW  DVRTS08 
    USB Information:
              Apple Inc. iPhone
              Apple Inc. Built-in iSight
              Apple, Inc. Keyboard Hub
                        Logitech USB Receiver
                        Apple Inc. Apple Keyboard
              Apple Computer, Inc. IR Receiver
              Apple Inc. BRCM2046 Hub
                        Apple Inc. Bluetooth USB Host Controller
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    Thunderbolt Information:
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              [System] com.f-secure.aua.plist 3rd-Party support link
              [System] com.f-secure.clstate-periodic.plist 3rd-Party support link
              [System] com.f-secure.fsavd.dbhelper.plist 3rd-Party support link
              [System] com.f-secure.fsavd.plist 3rd-Party support link
              [System] com.f-secure.fsmac.firewall.plist 3rd-Party support link
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              iSightAudio: Version: 7.7.3 - SDK 10.9
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              Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
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              DivX  3rd-Party support link
              Flash Player  3rd-Party support link
              Flip4Mac WMV  3rd-Party support link
              Growl  3rd-Party support link
              Java  3rd-Party support link
              XBox 360 Controllers  3rd-Party support link
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              BrFirmDataProvider:          Version: 1.0.4 - SDK 10.4 3rd-Party support link
                        /Applications/Brother/Utilities/Firmware Update Tool/BrMain/resources/BrFirmDataProvider.app
              SLLauncher:          Version: 1.0 - SDK 10.5 3rd-Party support link
                        /Library/Application Support/Microsoft/Silverlight/OutOfBrowser/SLLauncher.app
              ControlCenter:          Version: 2.5.3 - SDK 10.5 3rd-Party support link
                        /Library/Printers/Brother/Utilities/ControlCenter/ControlCenter.app
              RemoteSetup:          Version: 3.0.9 - SDK 10.4 3rd-Party support link
                        /Library/Printers/Brother/Utilities/RemoteSetup.app
              CameraWindow:          Version: 7.11.0.1 - SDK 10.5 3rd-Party support link
                        /Applications/Canon Utilities/CameraWindow/CameraWindow.app
              X-Plane 10 Demo Installer:          Version: 3.10r1 - SDK 10.4 3rd-Party support link
                        /Users/[redacted]/Downloads/X-Plane 10 Demo Installer.app
              iSkysoft Helper Compact:          Version: 2.2.6.4 - SDK 10.5 3rd-Party support link
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              Amazon MP3 Downloader:          Version: INFO_PLIST_VERSION - SDK 10.4 3rd-Party support link
    Time Machine:
              Skip System Files: NO
              Mobile backups: OFF
              Auto backup: NO - Auto backup turned off
              Volumes being backed up:
                        Macintosh HD: Disk size: 595.37 GB Disk used: 380.36 GB
              Destinations:
                        My Passport for Mac [Local] (Last used)
                        Total size: 931.36 GB
                        Total number of backups: 57
                        Oldest backup: 2013-04-27 02:29:05 +0000
                        Last backup: 2013-11-20 10:53:56 +0000
                        Size of backup disk: Too small
                                  Backup size 931.36 GB < (Disk used 380.36 GB X 3)
              Time Machine details may not be accurate.
              All volumes being backed up may not be listed.
    Top Processes by CPU:
                   2%          WindowServer
                   1%          fscuif
                   1%          fsaua
                   0%          EtreCheck
                   0%          aosnotifyd
    Top Processes by Memory:
              315 MB          iTunes
              119 MB          softwareupdated
              106 MB          com.apple.WebKit.WebContent
              86 MB          Safari
              78 MB          com.apple.MediaLibraryService
    Virtual Memory Information:
              943 MB          Free RAM
              1.22 GB          Active RAM
              758 MB          Inactive RAM
              568 MB          Wired RAM
              1.32 GB          Page-ins
              103 MB          Page-outs

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