More than 2 partitions with Yosemite 10.10.2 ?

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benassis Author

Level 1

8 points

More than 2 partitions with Yosemite 10.10.2 ?

Hi,

I recently bought a new imac 21.5 inch, running Yosemite 10.10.2.

Imac Model 14,3

Processor speed 3,1 GHz Intel Core 17

Memory 16 Go 1600 MHz DDR3

I'm used to make three partitions on my internal disk; I do so with my external disk which becomes a mirror of my internal disk.

From my external drive, running Yosemite and using Disk utility, I tried to create 3 partitions on my internal disk. No way!

The disk utility allowed me to make only 2 partitions...

I would like to know why and if there is a trick to override Yosemite limitation .

iMac, Mac OS X (10.6.8)

Posted on Mar 1, 2015 2:12 PM

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Answer 1

baltwo

Level 9

62,386 points

Mar 1, 2015 5:34 PM in response to benassis

Start with http://apple.stackexchange.com/questions/154964/resizing-or-expanding-a-corestor age-volume

27" i7 iMac (Mid 2011) refurb, OS X Yo (10.10.2), Mavs, ML & SL, G4 450 MP w/10.5 & 9.2.2

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Answer 2

babowa

Level 9

78,580 points

Mar 1, 2015 6:36 PM in response to benassis

Do you have a fusion drive?

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Answer 3

benassis Author

Level 1

8 points

Mar 2, 2015 6:24 AM in response to babowa

Hi Babowa,

Yes, it is a fusion drive.

Here is the SATA/SATA Express description, from System Information:

Intel 8 Series Chipset :

Fournisseur : Intel

Produit : 8 Series Chipset

Vitesse de la liaison : 6 Gigabits

Vitesse de liaison négociée : 3 Gigabits

Interconnexion physique : SATA

Description : AHCI Version 1.30 Supported

APPLE HDD HTS541010A9E662 :

Capacité : 1 To (1 000 204 886 016 octets)

Modèle : APPLE HDD HTS541010A9E662

Révision : JA0AB5D0

Numéro de série : JD8002EZ0L22ZD

NCQ (Native Command Queuing) : Oui

Profondeur de la file d’attente : 32

Support amovible : Non

Disque amovible : Non

Nom BSD : disk1

Vitesse de rotation : 5400

Type de média : Rotation

Type de carte de partition : GPT (Tableau de partition GUID)

État S.M.A.R.T. : Vérifié

Volumes :

EFI :

Capacité : 209,7 Mo (209 715 200 octets)

Nom BSD : disk1s1

Contenu : EFI

UUID du volume : 0E239BC6-F960-3107-89CF-1C97F78BB46B

disk1s2 :

Capacité : 387,19 Go (387 191 177 216 octets)

Nom BSD : disk1s2

Contenu : Apple_CoreStorage

Recovery HD :

Capacité : 650 Mo (650 002 432 octets)

Nom BSD : disk1s3

Contenu : Apple_Boot

UUID du volume : 1C79A2E7-BDF8-3C90-B439-BF116F939A76

Imac2 :

Capacité : 612,02 Go (612 019 732 480 octets)

Disponible : 121,8 Go (121 798 213 632 octets)

Inscriptible : Oui

Système de fichiers : HFS+ journalisé

Nom BSD : disk1s4

Point de montage : /Volumes/Imac2

Contenu : Apple_HFS

UUID du volume : 41AEC687-345A-3473-A467-B72B0B660FE4

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Answer 4

keg55

Level 6

11,755 points

Mar 2, 2015 7:15 AM in response to benassis

With a Fusion Drive, you can only add 1 additional partition.

Can I add a partition to the hard disk with Fusion Drive?

Using Disk Utility, you can add one partition to the hard disk on Fusion Drive. Once you add the partition, the "plus" symbol in Disk Utility to add additional partitions will be grayed out. You cannot partition the Flash storage.

If I create a hard disk partition is it part of Fusion Drive?

The additional partition is not part of Fusion Drive. The new partition is a separate volume that is physically located on the hard disk drive.

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Answer 5

babowa

Level 9

78,580 points

Mar 2, 2015 7:50 AM in response to benassis

As already answered: unfortunately, only two partitions total with a fusion drive...... additionally, that includes a special version of Disk Utility.

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Answer 6

benassis Author

Level 1

8 points

Mar 2, 2015 2:06 PM in response to babowa

Thanks babowa. This helped me!

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Answer 7

babowa

Level 9

78,580 points

Mar 2, 2015 2:16 PM in response to benassis

You're welcome; FWIW, I had a fusion drive for a week (a refurb iMac which had multiple power problems, so it was returned as a DOA); returning it to its factory installed OS without the second partition I had created turned into somewhat of a headache. The replacement iMac does not have a fusion drive, thank goodness.

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