Can't resize partition - Size Greyed Out

Your Mac is most likely running from that disk drive. Hence you can resize it.

Allan

You have a Logical Partition (CoreStorage) for your Macintosh HD. See the field Type: in your screen shot.

Take a look at this link that shows how to use Terminal commands to resize a Logical Partition (CoreStorage).

You will have to use a couple diskutil Terminal commands to get your UUID and then to resize.

I would back up my system first.

If you're not using FileVault to encrypt your Macintosh HD or have a Fusion Drive, then I don't know how you would have ended up with a Logical Partition. Can you tell us how you ended up with a Logical Partition? Are you running the Yosemite Public Beta? What OS is on your Macintosh HD?

Hang on.. erased my last post.. didn't see all the other stuff you have posted.

I'm not sure what to tell you now.

Do this....

Open Terminal and type diskutil cs list and post the output here. We might be able to revert the Logical Partition back to Mac OS X without destroying any of your data/apps.

You should see something like this:

CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group 4F054225-5A81-420C-BD06-1CC6B39C1572

=========================================================

Name: Test OSX Partition

Status: Online

Size: 64986341376 B (65.0 GB)

Free Space: 383180800 B (383.2 MB)

|

+-< Physical Volume 39067585-7452-4B81-9CAA-B459170C38EF

| ----------------------------------------------------

| Index: 0

| Disk: disk0s6

| Status: Online

| Size: 64986341376 B (65.0 GB)

|

+-> Logical Volume Family C97FBC27-C62F-4704-AF58-D3F0997426D5

----------------------------------------------------------

Encryption Status: Unlocked

Encryption Type: None

Conversion Status: NoConversion

Conversion Direction: -none-

Has Encrypted Extents: No

Fully Secure: No

Passphrase Required: No

|

+-> Logical Volume 85C2C3F0-A4C6-4542-A102-0608E76CAFD6

---------------------------------------------------

Disk: disk1

Status: Online

Size (Total): 64250839040 B (64.3 GB)

Conversion Progress: -none-

Revertible: Yes (no decryption required)

LV Name: Test OSX Partition

Volume Name: Test OSX Partition

Content Hint: Apple_HFS

Well, we can't revert it. Towards the bottom you'll see Revertible: No.

Sort of wished you would have mentioned that the free space was for bootcamp. 🙂

I don't know what to do now for you. I don't know if you can go back into Bootcamp and try to remove that new partition assuming Bootcamp still sees it. I'm just not sure because I've never used Bootcamp.

The only thing I would try is to back up the system, create a bootable USB thumb drive using the OS X Recovery Disk Assistant which will create the Recovery HD on the thumb drive. Then boot from that thumb drive, go into Disk Utility and try to delete both partitions and create 1 single new one.

I think so, yes.

You HAVE to do this from the Recovery HD so restart and press Command+R which should take you into the Macintosh HD's Recovery HD. Use the Disk Utility Restore tab and make your Macintosh HD the Source and your Macintosh HD 2 the Destination then click the Restore button. This should do a block copy and you should be able to boot from the Macintosh HD 2 partition. If you can, we'll go from there to delete your Logical Partition (Macintosh HD).