How can I remove these partitions?
I was trying to setup a second partition to boot from Windows but wanted to start over since Windows will not install on the partitions. In Disk Utility I now have a partition 'W HD' that I have erased along with two smaller partitions. I'd like to remove these 3 and return to a single Macintosh HD partition, but the minus sign is greyed out when any of these 3 smaller partitions is selected with the note 'you can not remove this volume because the previous volume can not be resized.'
I am running Sierra 10.12.6 on an iMac (27 inch late 2013), 3.5 GHz Intel Core i7, 24 GB memory, with a fusion drive.
Here are the internal drives after running diskutil list:
iMac (27-inch, Late 2013), macOS Sierra (10.12.6), 3.5 GHz Intel Core i7, 24 GB memory
