Windows install question

Discussion in 'Windows, Linux & Others on the Mac' started by lkaist, May 24, 2018.

  1. lkaist macrumors newbie

    Joined:
    May 24, 2018
    #1
    hello i just bought imac 21.5 4k and its got 1tb fusion drive + 128ssd. im planning to install windows on it and is it possible to install windows with 60ssd+500hdd and high sierra with 60ssd+500hdd??
     
  2. amaze1499 macrumors regular

    amaze1499

    Joined:
    Oct 16, 2014
    #2
    I got a windows partition with 30GB. But it needs a lot of maintainance in terms of (cache) cleaning. Depends on what you are planning to do with it.
     
  3. lkaist thread starter macrumors newbie

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    May 24, 2018
    #3
    maintainance? u mean in windows?
     
  4. DeltaMac macrumors G3

    DeltaMac

    Joined:
    Jul 30, 2003
    Location:
    Delaware
    #4
    If you install Windows, using the Boot Camp assistant, and use half of the fusion drive, Windows does not use any of the SSD, and installs only on the spinning hard drive. You cannot choose to use any of the SSD for the Windows installation.

    note: the SSD part of a 1TB fusion drive is NOT 128 GB. That is only available on the larger 2 or 3 TB fusion drives. A 1TB fusion drive has a 1TB spinning hard drive, and the SSD device is only 32GB.
     
  5. lkaist thread starter macrumors newbie

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    May 24, 2018
    #5
    i bought additional 128g ssd so i have 1tb hdd and 128g sdd. do i still have 32g ssd only? ;(
     
  6. DeltaMac macrumors G3

    DeltaMac

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    Delaware
    #6
    You did say in your OP that you have a 1TB fusion drive.
    If that is correct, then you have two internal storage devices: a 1TB spinning hard drive, and a 32GB SSD. The two devices are combined by software, and seen as one logical drive.
    If you also have a 128GB external SSD, that does not affect the fusion drive, but is just your extra storage space.
     
  7. davidmartindale macrumors regular

    davidmartindale

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    #7
    Assuming Fusion drives are like the "hybrid" drives available from Seagate and the like than it is technically one storage device. As in they are not separable from each other in terms of SW. If they are not bonded correctly though they can show as separate volumes by the SW/FW
     
  8. DeltaMac macrumors G3

    DeltaMac

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    #8
    This is some inaccurate information.
    Apple's fusion drives are always two hardware devices (one SSD (flash storage), and one spinning hard drive, joined by software as a single logical volume in a Core Storage setup. A hybrid drive can't be used for a fusion drive, although I suppose if you would connect an SSD to the same Mac that has a hybrid drive, that those two devices could then be fused, and function effectively as a fusion drive. Not sure how the flash memory in the hybrid drive would affect that setup, might work just fine.
    You could think of a fusion drive as one storage device, but, more accurately, is a single volume, which is similar to a type of RAID. The OS decides how files are stored on the fusion drive. You don't have any control over either device (you can't decide to manually move files from the SSD to the HDD, for example)
    The fusion drive is fairly easy to separate ("Un-bond", if you like that term) through a couple of terminal commands, although the separation means losing any data stored on the logical volume (both devices are erased by the splitting process)
     
  9. davidmartindale macrumors regular

    davidmartindale

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    #9
    I should note that “As in they are not separable from each other in terms of SW” was meant to be HW for hardware. And yes I understand the core storage volume and how that works. I’ve actually repaired quite a few fusion drives that had become two separate logical volumes.

    I will say I know virtually nothing about hybrid drives, they’re just something I’ve seen before and assumed they were similar to fusion drives.

    But what I was saying is (and correct me if I’m wrong) is that the flash memory is soldered directly to the pcb of the mechanical drive housing and they share the same sata connection. So in terms of the hw in the machine and removing and upgrading it it is essentially one drive.

    But I haven’t opened up a MAC with a fusion drive so I may be wrong and there may be a separate ssd going through separate connections.
     
  10. DeltaMac macrumors G3

    DeltaMac

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    Jul 30, 2003
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    #10
    A hybrid drive (SSHD), such as one from Seagate, is a hard drive with flash memory included in the same housing, usually configured as cache for the hard drive. That flash memory can be fairly large, 4 or 8GB. Some hybrid drives, such as the WD Black2 drive, can be configured so the spinning drive is accessed independent of the SSD, even though both use the same connection, and are in the same drive case. I don't think the WD Black2 is compatible with macOS.

    Apple does not use a one device hybrid for its fusion drives. All are two devices (Might be SATA, or PCI-E, or one of a couple of other bus protocols that have been used within the last few years for storage). One is a standard spinning hard drive, and the other device is an SSD, each connected to whatever kind of connection is needed. Each device has its own connection, as they are separate physical devices, combined through software into one logical volume - a process you already know about.
     
  11. davidmartindale macrumors regular

    davidmartindale

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    #11
    Hmm good to know. Thanks Deltamac.
    When it comes to macs I am much more familiar with the software than the hardware.
    The more you know
     
  12. davidmartindale macrumors regular

    davidmartindale

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    #12

    I pulled up a teardown of the iMac with Fusion Drive and do see that yes indeed the Flash module is a PCIe SSD and there is a standard separate HDD. Good to know!
     

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