[64 bit] Ubuntu Freezes when transferring files to external hdd

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http://ubuntuforums.org – I am using a TB SATA hard drive with 512 byte sector size with two partitions set to FAT32. The entire drive is using a Hybrid MBR/GPT which worked perfectly in Windows 7 . That is, until I made it a Hybrid. I need it to be a Hybrid because I need to use this drive with legacy hardware that requires both MBR and 512 byte sector sizes. I am currently using it with a Plugable U3 USB 2.0 Docking Station (the only enclosure I could find that will support larger hard drives and still present it as a 512 byte drive). I had to format it in Windows 7 because gparted won't work with it at all. I need (Hardware)