Incorrect Partition Size

[yourmn]

Hi

I have an iMac with a 1TB Fusion Drive. 1 Only have 1 partition on the drive, but for some reason it is only listing it as 469GB.

I done 'First Aid' a few times, and tried to create a new partition, however that keeps failing. Any ideas?

 

[Darmok N Jalad]

Click on "View" in the corner and select "Show all devices." Almost seems like you have another partition in there that isn't showing, but the more detailed view might shed some more light on the situation.

 

[dianeoforegon]

I don't believe you are allowed to add more than one partition on a fusion drive with core storage.

 

[BLUEDOG314]

Go into terminal and type 'diskutil cs list' and paste what it says here.

 

[yourmn]

Finally got Disk Utility to show the correct file size by erasing through CMD + R!

Next problem - I cannot reinstall High Sierra! It’s getting as far as “about a minute remaining” and telling me that an error occurred while preparing the installation.

Any ideas?

 

[Fishrrman]

"Next problem - I cannot reinstall High Sierra! It’s getting as far as “about a minute remaining” and telling me that an error occurred while preparing the installation.
Any ideas?"

Yup. Here's one:
Create a bootable USB flash drive with the installer on it.
You'll need Boot Buddy, from here:
Boot Buddy – sqwarq
Format the flash drive (can be 8gb or 16gb) to HFS+ with journaling enabled.
The use BB to create the installer (takes only a few clicks of the mouse).

Next step:
Boot from the flash drive installer, but DON'T run the install yet.
Instead, quit the installer and open Disk Utility.
Now, ERASE the internal drive to Mac OS Extended with journaling enabled.
Quit Disk Utility and re-open the installer.

Then... try the install that way. There will be some restarts, and it will take some time, but...
... things may go much easier.

 

[Weaselboy]

I don't believe you are allowed to add more than one partition on a fusion drive with core storage.

You can't in Disk Util, but Bootcamp will carve out a partition for Windows. That seems to be the source of all the forum posts I have seen with the issue OP has here.