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Is about this title. I need to change my partition to NTFS and i can't because my HDD is occupied with Ubuntu.

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    Question does not make sense. You can't unmount the partition the system is on, nor can you "change" it to ntfs. What makes you want to do so?
    – psusi
    Feb 20, 2014 at 17:58
  • i want to change to windows 7
    – user250453
    Feb 20, 2014 at 18:03
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    Then install Windows... it will take care of formatting the drive.
    – psusi
    Feb 20, 2014 at 18:06
  • i dont have CD only have pendrive bro
    – user250453
    Feb 20, 2014 at 18:12
  • How to install Windows without a cd would be an entirely different question, and off topic for this site.
    – psusi
    Feb 20, 2014 at 18:40

2 Answers 2

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You can't if you want to continue using ubuntu. /dev/sda1 is your main partition and it cannot be changed to another file system without reformatting.

You need to use a live cd or another OS you have installed on your hard drive you reformat it, but you can't do it from inside ubuntu.

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open terminal and type sudo umount /dev/sda1

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  • worked for me. my sda1 was my thumbdrive. unmounted and made into a boot disk for my new OS
    – austin
    Nov 6, 2021 at 23:20

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