My Fusion Drive was splited in two

Hi to everyone.
I bought a mac mini late 2014 with fusion drive last month. My brother did the initial configuration with his apple id. When I tried to change to my apple id I didn`t get it. Then, I use ˜Find my Mac~to erase the mac mini and start over. But, when I tried to install OS X again the Fusion drive appeared splited in two: 120GB of SSD and 1TB of SATA HDD. I did the installation but now, I have two drive units in mac.
How can I join/merge these partitions? Am I need to reinstall OS X?
Thanks

Allan Eckert wrote:
There are command line instructions to create a Fusion Drive available on the web.
No need for any command lines.
Before doing any of below steps, if there is anything on the Mac Mini that needs to be saved, make sure that you have a valid backup of it: Mac Basics: Time Machine backs up your Mac - Apple Support
Start your mac and boot to Internet Recovery - power ON Mac Mini and after releasing power button (before mac's chime) press and hold ALT+CMD+R: let go buttons when you see spinning globe or - if you are using WiFi connection - when on the screen appears prompt to select WiFi network.
OS X: About OS X Recovery - Apple Support
When Interent Recovery is loaded, after prompt with choosing prefered language, select Disk Utility app and choose continue.
Next, select on the Disk Utility sidbar one of the disks that should be combined as Fusion Drive: Disk Utility will recognized that there is a problem with Fusion Drive and will prompt with question if you want to fix it. Selecting "FIX" button will re-create Fusion Drive and most likely erase all data on both drives.
More info: Mac mini (Late 2012 and later), iMac (Late 2012 and later): About Fusion Drive - Apple Support - check section "Lern More - Troubleshooting".
EDIT:
Learn more
Troubleshooting
The version of Disk Utility that comes with Fusion Drive is unique. Earlier versions of Disk Utility can't be used with a Fusion Drive.
If your system will not start because you see a flashing question mark or another alert:
Press the Power button and hold it down to power off your system.
Press the Power button again. After you hear the startup chime, press and hold Command-Option-R to start up to the Internet version of OS X Recovery.
A globe should appear with a "Starting Internet Recovery" message. It is now OK to release Command-Option-R.
A progress bar should appear and Internet Recovery should start and ask you to select a language.
Once you select a language, click Disk Utility in the window that appears and then click Continue.
If your Fusion Drive can be fixed with Disk Utility, you'll see a Disk icon with red lettering. Click the disk icon.
A dialog box appears offering to fix the Fusion Drive (shown above). Caution: Clicking Fix will erase your Fusion Drive. If you have a Time Machine backup of your Fusion Drive Mac, see Mac 101: Time Machine for information on how to restore from a Time Machine backup once the drive has been erased.
After the process is complete, the volume will change color to black. Quit Disk Utility, click Install OS X, then click Continue.

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Recreated the fusion drive from the terminal. No problem.
Now, because I am a glutton for punishment, I tried wiping the fusion drive again. This time, part way in, it kernel panicked. Luckily, I was able to reboot once again to the external drive.
At this point, the fusion drive was in the exact same messed up state as when I started. Disk Utility app could do nothing with it.
Fortunately, this time I went right to the command line, and was able to fix things up and recreate the fusion drive before anything else bad happened.
I gave up on wiping the drive for now. If I need to do so in the future, I will disable the fusion drive and try to wipe each physical drive separately.
I should note that this iMac has never given a spot of trouble before now, so I am highly suspicious of the way disk utility tries to wipe a fusion drive. I certainly won't try it again. (I don't know if it has ever kernel-panicked before in the 5 years I've owned it).

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Can someone let me know who I shouyld contact with regards to my below issue? I've spent hours upon hours trying to get my new iMac back from Apple store here in New York city, no success.
Purchased a new Late 2013 model 21" build-to-order iMac 3 months ago >
Hard drive partition corrupt within first month which required in store HD partition correction flash via genius bar >
HD hardware failed next month >
Genius appointment Feb 6 2014, was told new fusion drive was required and would take "2-3 days" >
7 days later I went in-store for status and was told they had no info and would call me with an update >
3 more days I go in store again after no call, still no status update >
Forced to purchase a new cheaper PC so I could keep working from home >
Now its 13-14 days later, I just spent over 2 more hours with Apple Support and still no results, now waiting for store Manager (“Matt”, W 14th St store in NYC) to call me. Its been 5 hours since my call this morning.
I have purchased a new computer as I work from home and cannot be without a computer fofr my job. This is ridiculous, I demanded a refund yet was told because I purchased from an authorized reseller (Tekserve - tekserve.com ) and not an actual Apple store, they cannot refund. Tekserve receipt states all support must go through Apple as it’s a build-to-order system. I paid over $1800 for this iMac (2.7GHZ quad core, 16gb RAM, Fusion drive etc..) a few months ago and it’s been the worst experience I’ve ever had with Apple in 7 years. Pi55ed off. Give me a new exact model iMac today OR give me a refund.
Apple employee, Look up the below repair ID, it'll have my cell phone number attached. Call me anytime with a solution. I've spent hours and hours on calls with Apple support with no results, no return calls from store manager.
Serial: D25LG******* / Repair ID R114745188

brettnyc wrote:
Thats my only option, I shall visit the store this evening and demand to see the manager.
Buying from an Authorized Apple reseller should never mean I get any less support than buying direct from Apple.
You're totally correct on both counts, when you ask to speak to the manager, even though you may be tempted to be angry the best approach to handling the situation is by being; calm, organzied and persistent. Bring all receipts, include names, times, places of who you spoke to and state your case.
I'm sure your issue will be addressed. In addition if you are in the US you can always call Apple's customer relations phone number, I believe the current number is 800-767-2775.
Good luck.
<Edited by Host>

I recently lost access to external hard drive connected to my iMac (no icon visible). My iTunes and iPhoto files are accessed from this drive. I can't seem to get the time machine to restore these two. that drive was NOT excluded from time machine backup

Hi.
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Frequently doing a SMC reset will help this issue, for directions please click the iMac SMC and PRAM reset link. Also check the obvious such as cables and connections. Or it's even possible the EHD has failed, they can and do.

DIY MAC Fusion Drive

I'd like to create my own MAC Fusion Drive, but I'm not a dev so I need a little bit of guidance, which would also help a lot of people I'm guessing.
I am trying to follow jollyjinx's instructions, which are not that detailed. Specifically, I am trying to find the names of my two drives and I can only find one. Maybe the drives are not connected in a way to do this I'm not sure. I have a 750GB HDD and an 80GB SSD installed internally in my 2011 Mac Mini. I have been using both drives, SSD for the OS and a handful of common files and the HDD for iPhoto and iTunes libraries. A Fusion drive would be perfect!
When I run dmesg in Terminal, here is what I get:
-bash-3.2# dmesg
PMAP: PCID enabled
Darwin Kernel Version 12.1.0: Tue Aug 14 13:29:55 PDT 2012; root:xnu-2050.9.2~1/RELEASE_X86_64
vm_page_bootstrap: 2003271 free pages and 77497 wired pages
kext submap [0xffffff7f8073e000 - 0xffffff8000000000], kernel text [0xffffff8000200000 - 0xffffff800073e000]
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corecrypto.kext FIPS integrity POST test passed!
corecrypto.kext FIPS AES CBC POST test passed!
corecrypto.kext FIPS TDES CBC POST test passed!
corecrypto.kext FIPS AES ECB AESNI POST test passed!
corecrypto.kext FIPS AES XTS AESNI POST test passed!
corecrypto.kext FIPS SHA POST test passed!
corecrypto.kext FIPS HMAC POST test passed!
corecrypto.kext FIPS ECDSA POST test passed!
corecrypto.kext FIPS DRBG POST test passed!
corecrypto.kext FIPS POST passed!
AppleACPICPU: ProcessorId=1 LocalApicId=0 Enabled
AppleACPICPU: ProcessorId=2 LocalApicId=2 Enabled
AppleACPICPU: ProcessorId=3 LocalApicId=1 Enabled
AppleACPICPU: ProcessorId=4 LocalApicId=3 Enabled
AppleACPICPU: ProcessorId=5 LocalApicId=255 Disabled
AppleACPICPU: ProcessorId=6 LocalApicId=255 Disabled
AppleACPICPU: ProcessorId=7 LocalApicId=255 Disabled
AppleACPICPU: ProcessorId=8 LocalApicId=255 Disabled
calling mpo_policy_init for TMSafetyNet
Security policy loaded: Safety net for Time Machine (TMSafetyNet)
calling mpo_policy_init for Sandbox
Security policy loaded: Seatbelt sandbox policy (Sandbox)
calling mpo_policy_init for Quarantine
Security policy loaded: Quarantine policy (Quarantine)
Copyright (c) 1982, 1986, 1989, 1991, 1993
          The Regents of the University of California. All rights reserved.
MAC Framework successfully initialized
using 16384 buffer headers and 10240 cluster IO buffer headers
IOAPIC: Version 0x20 Vectors 64:87
ACPI: System State [S0 S3 S4 S5] (S3)
PFM64 (36 cpu) 0xf10000000, 0xf0000000
[ PCI configuration begin ]
AppleIntelCPUPowerManagement: Turbo Ratios 0057
AppleIntelCPUPowerManagement: (built 13:47:00 Aug 14 2012) initialization complete
console relocated to 0xf60010000
PCI configuration changed (bridge=16 device=5 cardbus=0)
[ PCI configuration end, bridges 13 devices 18 ]
mbinit: done [96 MB total pool size, (64/32) split]
Pthread support ABORTS when sync kernel primitives misused
rooting via boot-uuid from /chosen: 7B269773-B97B-335A-A4EF-A3D6956395BA
Waiting on <dict ID="0"><key>IOProviderClass</key><string ID="1">IOResources</string><key>IOResourceMatch</key><string ID="2">boot-uuid-media</string></dict>
com.apple.AppleFSCompressionTypeZlib kmod start
com.apple.AppleFSCompressionTypeDataless kmod start
com.apple.AppleFSCompressionTypeZlib load succeeded
com.apple.AppleFSCompressionTypeDataless load succeeded
AppleIntelCPUPowerManagementClient: ready
BTCOEXIST off
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FireWire (OHCI) TI ID 823f built-in now active, GUID c82a14fffeeaff8c; max speed s800.
USBMSC Identifier (non-unique): 1690A44191FF 0x59b 0x370 0x0
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BSD root: disk4s2, major 1, minor 15
imageboot_setup_new: root image url is file:///BaseSystem.dmg
IOHDIXController: NOTE: administrator is creating non-ejectable disk image
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imageboot_mount_image: root device 0x1000011
HFS: Low Disk: Vol: Mac OS X Base System freeblks: 30158, warninglimit: 30790
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[BroadcomBluetoothHCIControllerUSBTransport][start] -- completed
DSMOS has arrived
[IOBluetoothHCIController][staticBluetoothHCIControllerTransportShowsUp] -- Received Bluetooth Controller register service notification
[IOBluetoothHCIController][start] -- completed
BCM5701Enet: Ethernet address c8:2a:14:59:28:c5
AirPort_Brcm4331: Ethernet address 28:cf:da:01:31:fd
IO80211Controller::dataLinkLayerAttachComplete(): adding AppleEFINVRAM notification
IO80211Interface::efiNVRAMPublished():
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AirPort: Link Down on en1. Reason 8 (Disassociated because station leaving).
en1::IO80211Interface::postMessage bssid changed
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en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 149 153 157 161 165
MacAuthEvent en1   Auth result for: 00:23:6c:bf:ae:20 MAC AUTH succeeded
wlEvent: en1 en1 Link UP virtIf = 0
AirPort: Link Up on en1
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en1::IO80211Interface::postMessage bssid changed
AirPort: RSN handshake complete on en1
[ffffff8018e64c00][BNBTrackpadDevice::init][75.15] init is complete
[ffffff8018e64c00][BNBTrackpadDevice::handleStart][75.15] returning 1
[ffffff8019e85800][AppleMultitouchHIDEventDriver::start] entered
[ffffff8018da6c00][AppleMultitouchDevice::start] entered
MacAuthEvent en1   Auth result for: 00:23:6c:bf:ae:20 MAC AUTH succeeded
MacAuthEvent en1   Auth result for: 00:23:6c:bf:ae:20 Unsolicited Auth
wlEvent: en1 en1 Link UP virtIf = 0
AirPort: RSN handshake complete on en1
wl0: Roamed or switched channel, reason #4, bssid 00:23:6c:bf:ae:20
en1: BSSID changed to 00:23:6c:bf:ae:20
en1::IO80211Interface::postMessage bssid changed
-bash-3.2#
I can only find one reference to a drive in the data, but maybe I'm missing something. Any help would be greatly appreciated!

So far, so good! The article steps worked perfectly. I setup the Fusion Drive and then restored from my Time Machine Backup (from the SSD). I then moved the files over that were on the HDD (which I also backed up on my external drive. Everything seems to be working great! The volume was previously named 80 SSD OS X (to differentiate from the HDD) and it is still named that, although, as you can see from the screenshot, it now has a 576GB capacity (not 750GB, which is what I thought I put in there--my memory is horrendous! lol) ....not a big deal. I consider this a huge success at this point. Thanks again for the article!

DIY Fusion Drive Problem (8,2)

Hey,
I wanted to go a step further and create my own DIY Fusion Drive. I had no problems installing the new ssd (128gb Samsung 840 Pro) instead of the hdd (standard mac hdd) and moving the hdd to the place where the optical drive has been.
I then proceeded to boot from a recovery USB Stick runing the mountain lion recovery partition on it. I configured both of these drives without any problems and finally created my Fusion Drive (visible in disk utility).
But here are things getting worse. My original plan was to recover from a TimeMachine Backup i created right before I started working on the Fusion Drive. But no, it said an error occured and I should restart the PC. After googling this error a little bit (and trying the recovery over and over again, different attempts to repair the time machine, which doesn't seemed to be broken etc.), I came up with the idea that my TimeMachine data could be corrupted and a whole backup is not possible. No problem I thought to myself.
You just try to install Mountain Lion fresh with your Recovery USB Stick and then get one or two folder from your backup that you need. But nope, installing Mountain Lion aborted with an error too while checking if my MacBook would fit the installation or something.
Last try: Cmd+R to start internet recovery. Downloaded the whole thing. Now I was able to reinstall LION fresh on my system (which of course would be the basic installation since my macbook came with Lion). Problem is: Lion doesn't know anything about Fusion Drive and I couldn't select any drive to install it on.
Right now I'm really thinking about installing the os on the ssd alone, what I didn't want to do. But I'm not seeing a possiblilty to get the system back up and running they way I wanted it to.
Now it's on you guys. My last hope. Do you have any ideas on how to fix this problem? I read so many guides and neither of them came up with the problems I have. They just say "and after configurating your fusion drive, you just install moutain lion again and you're good" :|
Thank you very much,
MrMütze

I just tried what would happen if a delete the Fusion drive again. I was able to start the installation process of LION to my SSD, but Mountain Lion still aborted with an error while evaluating my system. So it shouldn't be a problem associated with the FusionDrive.

Fusion drive ssd gone missing after boot

Hi all,
I have a DIY fusion drive on my iMac which was working fine since I installed it over a year ago. This morning I booted my Mac and it got stuck while loading the Finder. Another reboot did not help so I booted the recovery partition and ran "diskutil list" and "diskutil cs list". The output looks fine: two physical disks forming a logical disk. But several minutes after booting the same commands don't show the ssd physical disk anymore and the logical disk goes offline.
Does anyone know what the problem with my ssd could be? After reboot the ssd is always detected and it always disappears after several minutes.
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Sounds like the SSD has failed.

Unable to install Windows on an 2010 iMac with home-made Fusion Drive

Hi there,
I've been very happy using mi iMac eversince I installed the SSD alongside the HDD. Only recently I tried to install Windows 7 but it doesn't seem to work. The installer runs, it seems as though Windows is installing but it doesn't ever seem to be able to boot. I've tried countless times. Everytime it boots to Windows it shows nothing but just a black screen with the cursor blinking at the top left corner.
Now, when I home-made the Fusion Drive the Mac OS was only 10.8.2 or older and I know that with 10.8.3 Apple has made improvements towards boot camp and especially the 3TB HDDs. I wonder if this could have anything to do.
Anyway, please enlighten me as to what is it that I need to do to make it work. I've been reading something about the position in which the Windows partition resides compared to GUID and EFI but honestly I have just the tiniest idea about all that. Just for the record, the following is what shows in the Terminal after diskutil list command:
diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *256.1 GB   disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:          Apple_CoreStorage                         255.7 GB   disk0s2
   3:                 Apple_Boot Boot OS X               134.2 MB   disk0s3
/dev/disk1
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   0:      GUID_partition_scheme                        *1.0 TB     disk1
   1:                        EFI                         209.7 MB   disk1s1
   2:          Apple_CoreStorage                         942.3 GB   disk1s2
   3:                 Apple_Boot Boot OS X               650.0 MB   disk1s3
   4:       Microsoft Basic Data                         57.0 GB    disk1s4
/dev/disk2
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   0:                  Apple_HFS Fusion Drive           *1.2 TB     disk2
Hope you can help..!

Hello again, by reading a couple of posts I learnt the steps and so, using an external OS I repartitioned the two internal drives making sure the Windows partition wasn't part of the Fusion Drive. I was very excited as I was sure it would work and went ahead and started the Win7 installation even before the MacOS was restored into the iMac.
No good news though. The installer run as expected however, when the time came for the iMac to boot from the newly installed Windows7, all I saw was a blank screen and a blinking dash at the top left corner of the screen.
Lastly, this morning I woke up to see that my old system was fully restored from Time Machine external back up. I also leart that using the Boot Camp Assistant I could remove the Windows partition that I created on Terminal from the external OS, which was surprising, I honestly thought that that partitioning arrangement would be off-limits for the Boot Camp Assistant.
Still, I haven't been succesfull installing Windows back to my Mac, can anybody help?

How to Repartition 3TB Fusion Drive?

Hi, I've noticed an interesting phenomenon of my iMac, which has a 3TB fusion drive. The phenomenon is that the fusion drive has a 2.2 TB + 800GB partitions. I understand fusion drive is actually a 128GB flash drive plus a 2.87GB hard drive. Then why is the fusion drive divided into a 2.2 TB and a 800 GB partitions?
Anyways, that was just my curiosity. I have a practical question. I am trying to install Windows 8.1 on this iMac to do some development/environment testing works. I realized when I use Boot Camp 5.1, it will not let me install Windows 8.1 successfully. The error is when I head to Windows installation, formatted the Boot Camp partition to NTFS (or simply just format it), it will keep telling me:
"Windows cannot be installed to this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only be installed GPT disks"
I then tried making a USB bootable disk through UNetBootin. It tells me the same thing. I don't have a CD or DVD drive on my iMac, so I cannot try burning a DVD. So then I started my research about this error.
And it seems to be a common error based on my research. The solution is that I should remove the bootcamp partition from Boot Camp Assistant and then use the Disk Utility to create a new partition for Windows. I did the first part, but then I head to the Disk Utility, it says:
"The full size of the Fusion Drive is not available for repartitioning."
I restarted the computer, and it tells me the same message.
Now I guess I have two questions, answering either one can help me through my goal.
1. How to create partitions on a 3TB fusion drive?
2. How to install Windows 8.1 on a Boot Camp partition?

Hey I meant to answer my own question! Thanks for reminding me.
A good reference link is on Super User where some other users already answered methods for Macbook Pro. Here is the link:
http://superuser.com/questions/481650/cant-use-bootcamp-partition-for-windows-8- installation/846439#846439
I am going to copy my reply from the thread. Here we go:
I was stuck with this challenge last night as well. After 10 hours, I finally have resolved this. As it turns out, not all OSX are the same. For example, I have Macbook Pro Retina, iMac, and Mac Pro. ClaitonLovatoJr's solution works on Macbook Pro Retina but not iMac or Mac Pro.
Here is why:
iMac (2014) and Mac Pro (2014) have different types of hard-drive. So far I haven't gotten Mac Pro to work, because it has the most particular type of hard-drive, perhaps Windows simply does not support. But again, I haven't tried for very long.
On iMac, here is how you can get Windows 8.1 (Professional) to install.
Since late 2012, iMac have fusion drive, which means its hard-drive is combined with SSD and traditional hard-drive. As a result, Apple has an interesting way to manage it. I am not going to the details. In short, EFI would not work with the hardware, so we must go through Apple's Boot Camp.
The first thing to do is to find a USB flash drive. Many people including me failed because we try to use SD card. This won't work because SD card is too advance for what we are doing. It will load the install program, but after loading it becomes all Windows, and then it will fail the installation. So what we need is an old fashion flash drive. I tried using SD card adapter, it failed too. It might have something to do with the type of adapter I have. But to be safe, we should USE FLASH DRIVE.
Then we will create an installation stick with Boot Camp Assistant. Be sure to use the latest 5.1 version. And we must check downloading from Apple, because it will give you drivers you need to complete the installation. If downloading failed for some reason, we can download the files here:
http://supportdownload.apple.com/download.info.apple.com/Apple_Support_Area/Appl e_Software_Updates/Mac_OS_X/downloads/031-3384.20140211.Xcc3e/BootCamp5.1.5621.z ip
And then manually place the files to the installation disk.
I suggest not to check install just yet, in case you need to manually place the file.
Now we can finally use Boot Camp Assistant to install Windows. We must use it because Boot Camp is the only application that can create usable disk space for the installation. Disk Utility or other type of applications will not work. Apple has a very specific design for the hybrid EFI-MBR system for iMac's fusion drive.
Then the computer should restart, and very likely to stuck in black screen. Don't panic, this is because there is a bug in Apple's Boot Camp loading system. The wait time is too short, if you have many devices connected it will not load correctly. We can power off the computer by holding the power button and then power up while holding option key.
Now we cannot choose EFI-Windows when booting up, we must choose Windows. EFI is faster and more advance, but we cannot use it.
Now we should be able to boot into the installation interface, a very lowres one. If you see a highres interface it means it went to the EFI. Power down and try again. If you don't see the lowres interface, something went wrong. Boot into OSX and remove Windows through Boot Camp Assistant (actually just to kill the new partition), and then redo everything.
If you are in lowres interface, it's not all done yet. You still need to format the new partition, either just by clicking on format or using command center. Now you should be able to install!
After installation we can set up Windows, but it will die and reboot. Don't panic, because iMac is not design for Windows. Windows thought it had some hardware failure. And then we will be able to login after rebooting, but it will stuck for a long period of time - like 20 to 30 minutes. This is because it needs to download and set up some drivers for the odd environment it encountered. Finally, we will see pop up to encourage us to install Boot Camp on Windows. We don't have to. We can always use option key went starting the computer. But it's up to you.
When shutting down Windows sometime it will fail and give you errors, this is because Windows ultimately does not work with Apple's driver very well (fusion drive or other hardware). No worry, just power down by holding the power button.
Hopefully this help!

Can I install Windows on my iMac 27, 3TB Fusion Drive, late-2012 with Boot Camp 5?

Hello. When I first opened the Boot Camp Assistant app, it said it could not work with the 3TB fusion drive. With the updated version of Boot Camp, the option to install Windows appeared. I tried to install Windows 8, but the loading bar stopped moving. I waited for hours, but it still did not move. I decided to quit the app, and re-open it, in order to try again. It crashed, and would not open. So I restarted my system and when I did that I noticed that I had about 1GB or so left of storage. This shocked me, because the disk was just suddenly filled for some reason. In hopes of fixing this I used an app called 'CleanMyMac' to try and recover the disk space. And as I thought the disk space returned to normal. However when I went to Disk Utility and clicked 'repair disk' it said this...
There is only 1 partition, so the Boot Camp process did fail.
I don't know whats wrong with my system though? I would like to install Windows, but I'm worried that I might recieve errors again. I have not got Apple Care, but I'm playing on buying it soon, due to it being almost a year since I bought the system.
Maybe I did something wrong when trying to install Windows with Boot Camp? I don't know, but if possible can someone please tell me if I can install Windows and if something is wrong with my system.
Here is some additional screen shots of the type of system I have.
Thank you for your help with this issue!

Which copy or version of Windows? and how where was it purchased?
my window installed itself perfectly on another computer.
One copy and you want to activate on two computers?
With 16GB, it will try to create 16GB hibernation file, 24GB page file, and need 20-30GB for the OS, plus room for temp, cache, applications, 9GB just temp to install SP1 update(s).
did you create 80GB or larger partition?
also, some macs with ssd + hard drive have issues, and of course you need Windows 7 64-bit home premium (Pro to use more).
OWC has up to 32GB, not cheap.
http://eshop.macsales.com/shop/memory/iMac/2010/DDR3_21.5_27
Crucial is usally very helpful, try email cs.

IMac with 3TB Fusion drive will not partition under Boot Camp

I have a 27" iMac with a 3TB Fusion drive and I am using 10.8.4.
I am trying to install Windows 8 Pro with Boot Camp. Everything starts well enough, but once I get to "Create a Partition for Windows" and setting a 505 GB Windows partition, it begins the process, but then seems to stop progressing with the status indicator pretty much stopped at a point directly under the "d" in the "Status: Partitioning disk.."
I've let it run for the past 1.5 hours and it hasn't budged.
This is not my first attempt at doing this on this machine. I tried manually partitioning with Disk Utility which pretty much ended up in a disaster that I was able to repair with some difficulty. That was covered in this thread.
I realize that 3TB drives were not supported under 10.8.3, but I thought that was fixed. Am I wrong?

This is a bit of a guess and you might have do a bit of further reading to understand what I am trying to say but basically:
When you buy a Mac - its Hard Disks come partitioned using the GPT partitioning scheme that is used for the UEFI boot process (All new Windows 8 badged computers have UEFI now as well - Macs have been using it for years). This is opposed to the old MBR partitioning scheme that was used with the BIOS boot process.
There are quite a few limitations of the MBR partitioning scheme including:
1. A limit of 4 partitions per volume
2. A limit of 2 TB per partition
3. Poor support for AHCI
When you run Boot Camp - it turns your partitioning into a hybrid of the two, so you get stuck with all the limitations of MBR - with the second bullet point above I suspect of giving you issues.
You have a couple of possible solutions:
1. Test with having all partitions less than 2 TB
or
2. (Technical) Try and install Windows 8 in EFI mode - its a bit tricky at the moment and a little bit of work - but I have it working on my MacBook Pro (although I do have nVidia graphics driver issues that you may or may not encounter as well). See my wiki at multiboot.info for links if you want to attempt this

Boot camp Yosemite Win 8.1 3tb Fusion Drive problems

Hi,
As many other have reported on the internet I am having problems installing windows on my iMac 27' late 2014 3tb fusion drive, where the partition I create falls outside the 2.2tb limit that prevents windows to be installed when selecting disk under the windows installation (i.e, same problem as Win 8.1, iMac Retina 3TB Fusion, Yosemite, Boot Camp fail!).
Is my understanding correct that this issue was solved in the OS X Mountain Lion Update v10.8.3 or was all they did to make sure boot camp could create a partition, but windows still couldn't find it?
I am using Yosemite 10.10.2 and I am wondering if for some reason they didn't include this update?
Has anyone successfully installed windows through boot camp on a 3tb fusion drive on yosemite, without 'manually' dividing the 3tb fusion into two partitions, and then creating the windows partition within the first partition?
Many thanks
iMac (Retina 5K, 27-inch, Late 2014), OS X Yosemite (10.10.2), 3tb fusion drive

You are correct. Please see - iMac (27-inch, Late 2012): Boot Camp alert with 3TB hard drive - Apple Support.
BCA should work. If you are running into any issues, can you post the output of the following Terminal commands?
diskutil list
diskutil cs list
sudo gpt -vv r show /dev/disk0
sudo gpt -vv r show /dev/disk1
sudo fdisk /dev/disk0
sudo fdisk /dev/disk1

My Fusion Drive was splited in two

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