I cannot write file onto samba share

[Andrea Ganduglia <nonews.org@gmail.com>]

I cannot figured out what happening. I have a smbfs mount through I
share a network disk. On this, I can create files or directories, but
I cannot write any file. In other words:

WORKS
root@svista:~# mkdir -v /mnt/usb-modem/foo
mkdir: created directory `/mnt/usb-modem/foo'

WORKS
root@svista:~# touch /mnt/usb-modem/bar
root@svista:~# ll /mnt/usb-modem/
total 0
-rwxrwxrwx 1 alibi alibi 0 2010-06-03 15:36 bar
drwxrwxrwx 2 alibi alibi 0 2009-06-15 18:30 foo

DOESN'T WORK
root@svista:~# date > /mnt/usb-modem/readme.txt
-su: /mnt/usb-modem/readme.txt: Permission denied

Can you help me?


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