[ubuntu] Mount folder effecting the size of my "Filesystem"

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http://ubuntuforums.org – Hi, I am having a Low Disk error, saying my file system is low. I ran a Disk Usage Analazyer on the file system and it has pleaty of space in the primary directories. What is showing up in red is 2 of my three drive I have automatically mounting on boot. The mounted drives are 1 and 2 TB and are formatted to ntfs. My filesystem is only 250gb, and the space I have used in the mounted drive is about the same amount(200gb or so), this is leading me to believe the used space I have on the mounted drives are somehow adding together and subtracting from the filesystem. Has anyone had a simular is (Hardware)