On Sat, May 14, 2016 at 05:19:07AM +0100, Always Learning wrote: > > > On Fri, 2016-05-13 at 23:17 -0453, William A. Mahaffey III wrote: > > > Is the disk or 1 of its partitions mounted ? If so, can it be > > unmounted Firstly, if at all possible, you're better off doing it with disks unmounted, booting from a gparted live CD. Secondly, if that's not practical, that message is common when using, say fdisk. Sometimes, running partprobe afterwards will reflect the new partition scheme, other times, you may just have to reboot. -- Scott Robbins PGP keyID EB3467D6 ( 1B48 077D 66F6 9DB0 FDC2 A409 FA54 EB34 67D6 ) gpg --keyserver pgp.mit.edu --recv-keys EB3467D6