I want to use a new hard drive for time machine. I try to restore the old backup into the new disk using disk utility. It fails with the following error :
source volume is read-write and cannot be unmounted, so it can't be
block copied
Why ?
What can I do ?
Best Answer
Problem understood. The disks were actually locked by the failed copy of the backup folder I tried to do between the two disks shortly before.
If it happens to you, just make sure the disks are not locked. In the worse case, reboot.