![]() So, as a followup, in case this is of interest to anyone, I may have found a way to accomplish this. I also want to avoid solutions that involve cracking open the iMac again to undo everything and put back the internal Superdrive to do the install and then have to go in a third time to put the SSD back in and reformat and restore everything all over again, because I'm too lazy to want to go through all that. I just want a fusion drive and a BOOTCAMP partition on the HD that boots Windows 7, just as I could do if I bought a new Mac with a fusion drive. Note that I am not trying to put Windows onto the SSD portion of the fusion drive, or anything special like that. So, I am here looking for anyone who may have overcome these or similar obstacles, or someone who understands the boot process enough to figure out a possible clever work-around. Sure enough the drive was visible on the Mac, but could not be booted during the install process. I used a Windows machine to create the flash drive from the a Windows Installer image file (.ISO). I can boot OS X from a flash drive, but not Windows, apparently. BOOTCAMP Assistant would not offer to do this for me on my Mac because it's not listed as a capability for my Mac. So next I tried creating a bootable USB flash drive Windows installer. I think this is probably because the Windows installer can't see the external drive. BOOTCAMP Assistant recognized the drive and allowed me to proceed with the install from my Windows install disk, however, after the partitioning and reboot, the Mac starts to access the external and then suddenly gives up and stops the install process. I have an external USB DVD drive, so I tried to use that. The problem is I have removed my internal Superdrive, and replaced it with the SSD. Giving up on this, I tried to just install BOOTCAMP from scratch with BOOTCAMP Assistant. I tried restoring both Winclone images and got to exactly the same place. Grub can see disk 1 but only the first partition of it, Disk1s0 (in Grub speak this seems to be called (D1,0) ). The BOOTCAMP partition, thanks to fusion and the Apple_CoreStorage arrangement, is now Disk1s4, instead of Disk0s4 as in the non-fusion partition arrangement. Then I played around with it and discovered it could not access the BOOTCAMP partition, which is why it won't boot. Looking into documentation for Grub, I learned it was a boot loader. It stops with an ERROR 15: "FILE NOT FOUND" and then hitting a key dumps me into Grub4DOS. The restore ran with no errors and the Bootcamp partition showed up in Startup Disk as a Windows boot disk. I created the Bootcamp partition using Disk Utility and formatted it correctly. I had a couple of known good Winclone images of my Windows 7 partition from this same Mac before the fusion mod, so I thought that would make the installation easy. I want to be able to boot 64bit Windows 7. I was aware there were some issues with fusion drives and Bootcamp, but I thought if I was under 2.2TB, it was supposed to be doable. Not a subtle improvement really a night and day difference. So much zippier with the fusion arrangement. The install went without a hitch, and I created the fusion and restored from a Time Machine backup. ![]() Along with the SSD, I put in a new 2TB HD. My hard drive died so I figured it was finally time to see if I can crack open the iMac, and while I'm in there, I might as well do the fusion thing to speed up this old Mac. I just installed a 128GB SSD in my late 2009 27" iMac using the OWC kit.
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