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I would very much appreciate your kind help with making multiple 50 GB partitions in my 500GB external hard drive. My System information is:

edmond@Dell:~$ uname -a; lsb_release -a
Linux Dell 3.2.0-35-generic #55-Ubuntu SMP Wed Dec 5 17:45:18 UTC 2012 i686 i686 i386 GNU/Linux
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 12.04.1 LTS
Release:    12.04
Codename:   precise

Thank you very much

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Have you considered using gparted? –  meder Dec 29 '12 at 17:25
meder is right, try it. –  nickanor Dec 29 '12 at 17:54
There are two active partitions. One is /dev/asd1 File System ext4 and the other is /dev/sda2 File System extended containing linux-swap. Could not unmount /dev/sda1 The partition could not be unmounted from the following mount points: / Most likely other partitions are also mounted on these mount points. You are advised to unmount them manually. Kindly advise how to unmount dev/sda1 manually. Thank you –  Edmond Condillac Dec 29 '12 at 18:53
I would be most grateful for your kind help regarding how to unmount dev/sda1 manually. Thank you –  Edmond Condillac Dec 29 '12 at 18:54
Make sure you don't have something using the file system you are trying to unmount. I.e. make sure your current directory in any terminal windows is not in the file system and make sure you are not looking at some part of it in Nautilus. Then 'sudo umount /dev/sda1'. If that doesn't work, pls post contents of /etc/fstab and output of 'df' cmd. –  Chris Good Dec 30 '12 at 3:44
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