New drive already has vfat after new fdisk

[Nat Gross]

Hi;
Just purchased a new Maxtor 200gig usb 2.0 device. Before plugging it
into the FC4 system, Windows was used to remove the windows partition.
Then plugged it into FC4, recognized it ok, ran FDISK and created 3
primary partions on it. Fdisk synced it and advised to reboot in order
to format it.
Here is fdisk -l on it (after reboot.)
# fdisk -l /dev/sda

Disk /dev/sda: 203.9 GB, 203928109056 bytes
255 heads, 63 sectors/track, 24792 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1       10240    82252768+  83  Linux
/dev/sda2           10241       20281    80654332+  83  Linux
/dev/sda3           20282       24792    36234607+  83  Linux

HOWEVER, the thing is ALREADY MOUNTED as ONE VFAT PARTITION! (Possibly
even before my fdsik. I did NOT format it, and I can create folders in
it.

# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/hda2              29G  9.6G   18G  35% /
none                  506M     0  506M   0% /dev/shm
/dev/hda5              33G  7.8G   23G  26% /usr
/dev/hda6              11G  3.5G  6.4G  35% /usr/extraData
/dev/hdc              619M  619M     0 100% /media/cdrecorder
/dev/sda1             190G  160K  190G   1% /media/usbdisk

I don't want vfat! Either ext3 or reiserfs, whichever is better for
database server. (advice?)
1. How did this happen?
2. How to fix it. (I sit broke?)

Much appreciated.
-Nat