Pbs of disk access

[Eric Tanguy]

I mount a vfat disk during the boot process with this line in /etc/fstab
:
/dev/sda1		/mnt/storex		vfat	users 0 0
The problem is that i can't access it in rw mode as user. I think i's a
normal security issue but if i remember is is possible possible to
enable it in rw mode for user using umask= but i can't remember and
refind it. Could we help me ?
Thanxes
Eric