Problem accessing external usb drive in non superuser mode

[Divick Kishore <divick.kishore@gmail.com>]

Hi,
    I have an external hard disk connected through usb, which though I am able to mount, but I am unable to access the drive without superuser privileges. Running mount command shows the following:

/dev/sda1 on /mnt/maxtor type ntfs (rw,noexec,nosuid,nodev,user=divkis01)

But when I try to access I see the following:

$: ls /mnt/maxtor/
ls: cannot open directory /mnt/maxtor/: Permission denied

I tried changing the owner but I see the following:

$:sudo chown divkis01 /mnt/maxtor/
chown: changing ownership of `/mnt/maxtor/': Read-only file system

BTW I do have sudo access (in case someone suggests that I might not have sudo permission to change the ownership).

I have tried other methods as well (opening the nautilus and tried changing the access permissions as well using its GUI) but I see same permission issue.

Any help is appreciated,
Thanks in advance,
Divick