left out fat32 partition

[oskar debian lists]

One of my vaft32 partition are having surface or other kind of trouble that make the debian linux go slow in general execution, i modify and erase the respective line in /etc/fstab, but Debian Linux still mounting it, i do a: ls /mnt/* -ldh and the partition still there under "sys" owner there is a way to leave it out of the system, or i need reinstall my Debian Linux and left out that partition since the begining of the installation?   Any help will be appreciated, Thanks.