I have a new MacBook Pro. I want to create three partitions on my hard drive, but Disk Utility tells me, "You may only split this partition in two"
What do I have to do to create a third partition?
MacBook Pro (Retina, 15-inch, Mid 2015), OS X Yosemite (10.10.5)
Create two partitions, click on apply. Then divide the 'bottom' partition in two. Then you will have three partitions. A little planning ahead regarding the sizes is recommended..
Ciao.
When I do that and select the second partition, it says, "You may only merge this partition with the one before it.
Click on the second Partition. It should show a blue border:
Then click on the '+' sign:
Ciao.
If your drive is a Logical Volume Group (LVG), you are using CoreStorage and that file system only allows 2 partitions.
To check, open Terminal and type diskutil cs list and post your results here. You should see something like below if you do.
Last login: Tue Sep 1 04:50:41 on console
CoreStorage logical volume groups (1 found)
+-- Logical Volume Group 58EB8CB0-21FC-47C3-B507-880639AAAFB6
=========================================================
Name: Macintosh HD
Status: Online
Size: 125140434944 B (125.1 GB)
Free Space: 15958016 B (16.0 MB)
|
+-< Physical Volume 3BE66E07-52E3-4D26-98D5-1448E255BBFE
| ----------------------------------------------------
| Index: 0
| Disk: disk0s2
| Status: Online
| Size: 125140434944 B (125.1 GB)
|
+-> Logical Volume Family B8A1CE89-F0B3-4C91-80E6-501D8B5BB526
----------------------------------------------------------
Encryption Type: AES-XTS
Encryption Status: Unlocked
Conversion Status: Complete
High Level Queries: Fully Secure
| Passphrase Required
| Accepts New Users
| Has Visible Users
| Has Volume Key
|
+-> Logical Volume C4D7294A-8F77-40D7-8DED-A86992300339
---------------------------------------------------
Disk: disk3
Status: Online
Size (Total): 124772155392 B (124.8 GB)
Revertible: Yes (unlock and decryption required)
LV Name: Macintosh HD
Volume Name: Macintosh HD
Content Hint: Apple_HFS
Yes, it is using Core Storage.
Is there any disadvantage to revert it to HFS+?
Nope just as long as it is revertible and you don't need FileVault turned on.
Look at the end of the list and if you see the following, you will need to Turn Off FileVault so it decrypts the volume; then you can revert it. If you don't have a FileVault volume and it still says it's revertible, then you just have to do the revert command below. You just need the Disk value with the revert command.
+-> Logical Volume C4D7294A-8F77-40D7-8DED-A86992300339
---------------------------------------------------
Disk: disk3
Status: Online
Size (Total): 124772155392 B (124.8 GB)
Revertible: Yes (unlock and decryption required)
LV Name: Macintosh HD
Volume Name: Macintosh HD
Content Hint: Apple_HFS
Look at the end of the list under the Logical Volume and find the Disk line and use its value. My example uses the value from my prior post's Logical Volume parts. You will not lose any data as this is a non-destructive command.
Example using Terminal:
diskutil cs revert disk3
I reverted to HFS+ and was able to partition everything the way I wanted. Thanks keg55!
You're welcome.
How do I create additional partitions
