Hard Drive Formatting and Unmounting Errors

Posted by Lucas Carther on Ask Ubuntu See other posts from Ask Ubuntu or by Lucas Carther
Published on 2012-02-04T20:16:36Z Indexed on 2012/06/08 4:47 UTC
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I'm trying to format a hard drive using Ubuntu 11.10. Every time that I attempt to format it from the Disk Utility, I get the error saying the device is busy, and under details it says:

/dev/sda1 is mounted

Then when I try to unmount it from the disk utility, it shows that the operation has failed and says:

Error unmounting: umount exited with exit code 1: helper failed with:
umount: only root can unmount UUID=70D6-1701 from /boot/efi

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