If it is a dynamic NTFS volume it is not supported by FreeBSD. If not you could try connecting the disk to a Windows machine, eject the volume, and then retry with FreeNAS.
NTFS support is a bit flaky on FreeBSD. If this has important data I'd strongly recommend you just move it from your Windows machine.
If you want to try mounting to drive in FreeNAS the drive must be ejected cleanly and should be error free. You may want to run a chkdsk in Windows as well as make sure you eject the drive properly. FreeBSD's NTFS support doesn't have any chkdsk equivalent so errors can trash your data.
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