Leave this flash drive connected to your Mac until Windows installation is finished. Connect a 16 GB or larger USB flash drive that you can erase.
The article below will help make sure you have a recent backup: I have several things for you to try.įirst, It's a good idea to make sure that you have a recent backup of your iMac's important data. I use Boot Camp to dual-boot my system as well, so I know it's important we get this install issue resolved. Thanks for using Apple Support Communities.īased on your post, I understand that you are having an issue installing Windows 7 on your iMac (21.5-inch, Mid 2010).