late 2015 27" iMac storage

Discussion in 'iMac' started by yippi, Jan 31, 2016.

  1. yippi macrumors member

    Nov 16, 2013
    At present I have a 2TB fusion drive and hope to upgrade to one or better 2 SSDs (2TB). The size of the Fusion drive is 3.5". Can there be two SSDs fitted? Are there 2 connectors?

  2. killhippie macrumors regular


    Jan 12, 2016
    Not unless you can get hold of a blade PCIe SSD of 1TB that fits the logic board of an iMac. Also I'm not sure if Apple have specified their own custom firmware in the controller for that and how it interacts with third party PCIe SSD's or even if there are any that fit the iMac.. As to the the HDD yes but you will need a temp sensor kit from someone like OWC. Not an easy job, and the screen can be broken very easily.
  3. yippi thread starter macrumors member

    Nov 16, 2013
    Hi, sorry for the late response, I was out of town.

    Do you mean that one SSD+temp sensor can be fitted in place of the present HDD?

    You mention a blade SSD of 1TB. Why that? A 2.5" SSD doesn't work?
  4. ninja2000 macrumors 6502

    Dec 16, 2010
    You shouldn't need a temp sensor if you replace the HDD with an SSD. I have tried a 850 evo and a crucial m500 in the 2014 retina and had no fan issues.

    A 2.5" ssd will work in place of the HDD, also samsung do a 2tb evo. The 128GB blade PCI-e SSD which comes as part of the fusion drive need to be replaced with another apple PCI-e SSD. You cannot use off the shelf PCI-e SSDs. The only place you can normally get these is ebay where people have pulled them from a machine.

    I would say your best bet is to break the fusion, install the OS on the 128gb PCI-e and change the HDD for an SSD (this is what I have done).

    With regards to changing the HDD to an SSD, I found that very easy (easier than an old style mac). Just make sure you get a replacement tape kit (picked mine up on ebay) and follow the guides on ifixit.
  5. maflynn Moderator


    Staff Member

    May 3, 2009
    Check out the ifixit tear down, you'll have your answer, including how difficult it is to open the iMac.

    The flash storage is not an SSD in the 3.5" form factor but like Apple's laptops, it uses the blade formfactor. The hard drive itself should fit easy enough however.
  6. yippi thread starter macrumors member

    Nov 16, 2013
    Thanks to all of you. I hope the screen will survive.
  7. briloronmacrumo macrumors 6502


    Jan 25, 2008
    Plus the flash is on the underside of the logic board, so a full disassembly will be required if that component is being swapped out. Possibly consider attaching external storage ( either USB 3 or Thunderbolt 2 ) instead.

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