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I recently formatted a hard drive as ext3 to get it to mount in CentOS 5. Now it automatically mounts when I connect it to the USB port, and mounts to /media/disk, but i am not able to write to it.

here is the output of my mount command:

/dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw,acl,usrquota,grpquota)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/sdc1 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
/dev/mapper/vg_epa1-lv_root on /lv_root type ext4 (rw,acl)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
epa2:/shares/epa2 on /shares/epa2 type nfs (rw,acl,hard,intr,addr=172.31.10.19)
nemo:/shares/nemo on /shares/nemo type nfs (rw,acl,hard,intr,addr=172.31.10.20)
nfsd on /proc/fs/nfsd type nfsd (rw)
/dev/sde1 on /media/disk type ext3 (rw,noexec,nosuid,nodev)

The last one is my external drive. it is showing as rw, so how come I cant put files on it?

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What happens when you try to write files to it? What are the permissions on the target drive/folder? – Ƭᴇcʜιᴇ007 Dec 19 '11 at 17:36
    
I can't even make a target folder on the drive. it returns "mkdir: cannot create directory `test': Permission denied". The permissions in /media/disk are drwxr-xr-x 3 root root 4096 Dec 19 11:49 . – Derek Dec 19 '11 at 17:40
1  
It appears that only "root" has write permissions. Are you the "root" user? Does it work if you change permissions to (say) 777? – Ƭᴇcʜιᴇ007 Dec 19 '11 at 19:52
    
Didnt realize you needed to change permissions to wide open. I was root on both systems, but I formatted on one system, and used it on another – Derek Dec 19 '11 at 21:49
    
It's not that you NEED to change them to wide-open, I suggested it for the sake of testing/troubleshooting. :) – Ƭᴇcʜιᴇ007 Dec 19 '11 at 21:55

If you are using kde you probably need to dig into policykit options I think. I had similar problem, and changing permissions with that helped me.

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