I am posting this as a new question because it seems that all the other queries regarding this issue are closed once somebody mentions the updated drivers from Seagate. I have a couple of 2 TB Seagate external HDs that do not function under Sierra. They work fine on all of my other Macs that are not running Sierra. I have dowloaded the driver that everybody references (and even paid for the full version), but even with the driver the Seagate drives are not mounting.

The Paragon system preference shows the drives in a greyed out state but will not mount them. I have gone as far as backing up and completely erasing the drives on one of the other macs, but the Seagates will still not mount on my iMac 27' - 3.5 GHz Intel Core i7 running Sierra 10.12.3. When I try opening Disk Utility, I get the spinning 'Loading disks' and it continues to spin until I manually unplug the drive.

How to Fully Remove Paragon NTFS for Mac. Paragon NTFS is a volume management tool that claims to provides fast and transparent access to NTFS partitions as Mac OS X-native. Users will be able to browse contents, read and modify files, copy and create new files and folders, format and repair NTFS partitions in Mac OS.

Sierra is rendering half of my external drives useless on my primary mac:( Please help. You never mentioned whether you were plugging the drives into a hub. On my primary iMac, a Late-2015 27' 5K Retina running Sierra 10.12.3, I have 7-port powered hub with 3 WD drives, a Time Capsule, a headphone DAC and occasionally USB flash drives plugged in and I have no issue with any of them. I also have Paragon NTFS for Mac OS X installed.

I don't know what the problem is but I suspect it's not just because they happen to be Seagate drives. If you could run and post the results of EtreCheck it might help. Daniel Sass wrote: Thank you for your responses, but I've tried all of that. Outlook for mac 15.39 170919. I have reset the SMC and I even completed wiped the drives (reformatted) on a Mac using Lion - but these drives are just not working on Sierra:( The good news is that I do not have to worry about data loss because the drives work on every system except for Sierra.

The bad news is that I have 5 external hard drives (10 TB) of valuable space that I cannot use on my primary Mac. Reformatted how? What is the partition map and format you used in Lion? And I second dialabrain's suggestion: run Etrecheck and post its report here. It does look like some software you are running in these machines may be involved.

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