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I need to create an additional partition on an external harddrive where ubuntu is installed. is there any way i can do this without affecting ubuntu.Its 1Tb and ubuntu and my files only takes 30gb of it. I need an extra partition atleast 400gb. Gparted not allowing me to do that since ubuntu is on the same partition I can connect this external harddrive to another pc but scared if it affects Ubuntu

bergdi
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If you boot a LiveCD or LiveUSB, you can make sure all partitions on the hdd are unmounted and resize to your needs.

Hellreaver
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Back up your data since repartitioning can result in data loss.

You can't chance an active partition and the partition mounted at / can't be unmounted in a running system. That's why you can't do your intended operation.

Ubuntu provides the so-called "Start Disk Creator" which you can use to put a live system on a USB stick. It needs to be formatted with FAT32.

If you have another computer with a Linux system and GParted on it, you can use it instead, so you don't have to create a live medium. The only important thing is that the partitions aren't mounted.

UTF-8
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  • thank you..both of you..one last question. the other pc is windows 8. is there a partition manager that could see linux partitions or should i just go with the liveCD as Hellreaver said – bergdi Apr 14 '15 at 20:08
  • If the partitions are recognized as what format they really are, it should be no problem. If they are recognized as "unkown", it's critical. If they are recognized as unallocated space, don't do anything with that program. Generally speaking, partitioning with Windows is a very bad idea. – UTF-8 Apr 14 '15 at 20:46