instag8r,
If you tell us which OS you're running, what size the partition is, and how it was created (by FDISK from a DOS-based version of Windows, by Disk Manager in the NT-based OS, third party partitioning tool, etc.) then we can give you a more informed answer.
If this is NT or Windows 2000, then use of the CONVERT command will cause you to have 512 byte clusters. Not good for most purposes, unless the partition is really small.
The Windows XP CONVERT executable can convert a FAT partition to NTFS that has 4,096 byte clusters. That's a good thing. But it doesn't always succeed at this, depending on how the original partition was created and what size it is.
Come to think of it, your original question is vague enough to have me wondering if you're trying to convert TO NTFS or FROM NTFS. Please be more specific.
- prosaic