If I manually choose the Windows installer by powering up with the Option key pressed, I get the choice of "Windows" or "MBA SSD" (the Mac OS partition), I can select the "Windows" icon, but although the computer restarts as I mentioned, the USB2 drive acts dormant. Boot Camp Assistant takes me through the steps choosing the Windows installer as the startup disk, the computer does restart, I can see the screen light up to a dark (but not black) display, but the USB2 flash drive LED light is off (no activity compared to when it was/is used on Mac OS), and nothing else happens. But now after the partitioning, and using either my original Microsoft download of the Win 7 ISO or a re-download of it, the Windows installer on my Kingston USB2 "Traveler" flash drive (which worked before) fails. I reinstalled MacOS 10.13.6 and that fixed the Boot Camp partitioning and allowed me a "Divide Equally" choice, so now I had (and have) 240 GB for Mac OS and 240 GB for a Windows partition. Tried installing Windows 7 Ultimate once again using same process, but the partition sizes available were still only 8 GB and 36 GB. That SSD worked (and works) fine, under Mac OS. This allows you restore an entire backup of your Mac OS X installation, applications and files back to a hard disk. I wanted more storage anyway, so I replaced the OEM SSD with a Kingston 480 GB NVMe SSD (+ Sintech adapter). The partition could not be sized other than 8 GB or 36 GB because the Boot Camp Assistant software was failing in some way. ![]() Originally, using the OEM 128 GB NVMe SSD, had one success with Boot Camp Assistant and a 36 GB Boot Camp partition. ![]() Step 4: Reinstall Mac OS X without Losing Data. Cannot install Windows 7 on MacBook Air (13" mid-2013) running MacOS 10.13.6. If you don’t want to suffer from an unexpected loss of your important files during the reinstallation, then you should take a backup of your data beforehand.
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