Formatted Fusion drive only shows 500GB?

[spinstorm]

Anyone have any suggestions?

I tried to reformat and reinstall my old iMac but I ran into a problem. I had the 1TB fusion drive partitioned as 2 x 500GB; I formatted one partition and then tried to combine the partitions and reformat in disk utility through the recovery partition.

But it froze so after 30 mins I powered it off and on again and now disk utility can only see half the HDD - I have been through every setting I can see and I can’t find a way to get it back to the full size.

 

[CWallace]

Probably need to re-partition if via the Terminal.

I've used this three-part guide before: http://www.theinstructional.com/guides/disk-management-from-the-command-line-part-1

 

[spinstorm]

You are correct. I just took it to an Apple Store and the genius spent an hour on terminal fixing it.

I could have done it myself but he did a great job. One benefit of him doing it is he reinstalled the OS from an image which was much faster than I could do it having to download and reinstall it.

 

[ZipZap]

Probably need to re-partition if via the Terminal.

I've used this three-part guide before: http://www.theinstructional.com/guides/disk-management-from-the-command-line-part-1

Its sad that a user has to resort to working with terminal to fix a problem that disk manager should handle.