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Helpful answers
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Oct 2, 2016 12:40 PM in response to sasuke21by Allen A,Hi sasuke21,
Thanks for using the Apple Support Communities. Sorry to hear that you are having these issues with Sierra on your iMac. Assuming that they are USB drives, if you continue to have issues with your external hard drives not being recognized in Sierra, you may find the troubleshooting steps outlined in the following article helpful:
macOS Sierra: If a USB device isn’t working
You may also want to try booting to Recovery and seeing if the drives are recognized in Disk Utility there:
About macOS Recovery - Apple Support
Regards. -
Oct 3, 2016 3:16 PM in response to sasuke21by sixstringnickel,If it's a Seagate drive, update the driver here. http://www.seagate.com/support/external-hard-drives/desktop-hard-drives/backup-p lus-desk/ntfs-driver-for-mac-os-master-dl/
