Usb external hard disk problem

I have recently purchased USB external hard disk drive (500Gig) and need to use it as as a backup drive for linux. My distro is fedora 10. I had mount it and I cannot save data on it. When I plug it on it is being detected and when I open it I found out that there is a folder lost+found. This folder could not be displayed if clicked.

here is my vi /etc/fstab file

/dev/mapper/VolGroup00-LogVol00 / ext3 rw 0 0
/proc /proc proc rw 0 0
sysfs /sys sysfs rw 0 0
devpts /dev/pts devpts rw,gid=5,mode=620 0 0
/dev/sda1 /boot ext3 rw 0 0
tmpfs /dev/shm tmpfs rw 0 0
none /proc/sys/fs/binfmt_misc binfmt_misc rw 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw 0 0
gvfs-fuse-daemon /home/Administrator/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,user=Administrator 0 0
/dev/sdb1 /mnt/sdb1 ext3 rw,nosuid,nodev,uhelper=hal 0 0
/dev/sdc1 /media/disk ext3 rw,nosuid,nodev,uhelper=hal 0 0

# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
142G 7.1G 127G 6% /
/dev/sda1 190M 21M 160M 12% /boot
tmpfs 2.0G 88K 2.0G 1% /dev/shm
/dev/sdb1 459G 199M 435G 1% /mnt/sdb1
/dev/sdc1 459G 199M 435G 1% /media/disk

How do I fix this

You have to give its ownership to Regular User.
Execute id command and note down user and group id. Give ownership using chown command.

Code:

---

id
su -
chown -R user_id:group_id /media/disk
exit

---

In case it doesn't work, post output of id command here.

the output of the code id
[root@Programming ~]# id
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(di sk),10(wheel)

And for the chown -R user_id:group_id /media/disk the end product was chown: invalid user: 'user_id:group_id'

You have to replace user_id and group_id with actual ids.
Execute id command as Regular User instead of root and use its user_id and group_id in chown command.

Post output of id command executed as Regular User.