To format an external drive as MS-DOS (FAT), use Disk Utility, located in the Other folder in Launchpad.You can download the support software to an external drive.Install support software that lets Windows work with your Mac hardware.An external drive, such as a USB thumb drive, is formatted as MS-DOS (FAT).An installation disc with Windows 7 x32/64, depending on your Mac model.A built-in disc drive or a compatible external optical drive.If they aren't available, use a USB keyboard and mouse. The keyboard and mouse or trackpad that came with your Mac.If you are installing Windows on a portable computer, connect the power adapter. A Back-Up of your Disk BEFORE Partitioning or Installing Windows.A printed copy of this guide contains information you need to refer to when installing Windows.Also, check the external SSD for errors using the steps outlined above. Note: If you are booting from an external SSD, make sure that it is properly connected and that the data cable is not damaged.

Make sure to back up your important data before doing so. Reinstall Windows: If none of the above steps work, you may need to reinstall Windows. This will check the hard drive for errors and try to fix them. To do this, open the Command Prompt as an administrator and type 'chkdsk /f /r' (without quotes). Run a disk check: If the issue persists, you may need to run a disk check. Once in Safe Mode, try to access the hard drive and see if the issue persists. You can download the latest version from the Apple website.īoot into Safe Mode: Boot into Windows Safe Mode by holding down the F8 key while your Mac is booting up. Reinstall the Boot Camp drivers: Make sure that you have the latest version of the Boot Camp drivers installed on your Mac. Select 'Properties,' then 'Tools,' and finally 'Check.' If any errors are found, Windows will attempt to fix them. Check the hard drive for errors: With another Windows computer, plug in your external SSD, go to the 'Computer' or 'This PC' and right-click on the drive.

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