Issue formatting Seagate external in High Sierra

I have been using Seagate external hard drives for years to store data on them, and as an external time machine. I have always formatted them to Mac OS extended in disk utility. Since updating to High Sierra, I can no longer do that. It actually brick's the hard drives, and doesn't let them mount. I get an error message that says "unmounting disk. Mediakit reports not enough space on device for requested operation. Operation failed.

The disk is then greyed out, and says not mounted. The only way I can reactivate it is to do it in Windows through Parallels and then format it there back to Windows NT. This has happened on 2 brand new drives.

I've spoken to Seagate and they say it's a High Sierra issue, and that I have to use Paragon for now. I find this hard to believe.

Does anyone have any help to offer?

Cheers

MacBook Pro with Retina display, High Sierra 10.13.1

Posted on Nov 21, 2017 6:24 AM

Top-ranking reply

David Brandfass

Level 1

9 points

Posted on Nov 27, 2017 6:10 PM

Okay, here is what I did.

1. I disconnected the unmounted (grayed out) 2T WD Elements drive.

2. Then I reconnected the 2T WD drive. Dialog box popped which said that the MacOS (10.13.1) could not read the drive, did I want to initialize it. Clicked "Yes" or "OK" and up popped Disk Utility.

3. Under "View" in Disk Utility, I selected, "Show All Devices"

4. Now the WD Elements was shown with "Untitled" beneath it.

5. Took Disk Utility's suggestion as to format, and after about a minute, it was formatted and mounted.

View in context

16 replies

Mar 17, 2018 2:29 PM in response to jibberj

Hi there,

Is it USB drive? Please reconnect external hard drive to your Mac running High Sierra from Terminal run 'diskutil list' and post output here.

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Issue formatting Seagate external in High Sierra