Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

MacPap

macrumors newbie
Original poster
Oct 22, 2025
1
0
Hi everyone.

I suddenly out of the blue, have run into a very strange problem and I wonder if it has occurred to anyone else.

So here it goes.

Wanting to backup my thunderbird folder on my mac mini (~/users/xxxxx/Library/thunderbird) I dragged it to an external SSD, I use to backup all sorts of folders and files. Note it was not the first time I did this. All the other times till today there was NO problem doing that.

While copying, at some point my mac-mini ejected the ssd drive with the message:

"You can’t copy the item “030 Archived Business Mails” because its name is too long or includes characters that are invalid on the destination volume."

(“030 Archived Business Mails” being a subfolder in my thunderbird local folder)

II tried to copy the same thunderbird folder (~/users/xxxxx/Library/thunderbird) by dragging it to another external ssd and to my surprise it did it without a peep.

However every time i try to copy this folder or its contents TO THIS particular external SSD the same thing happens.Other than this strange problem the SSD shows no problems at all copying ANY folder.

Mac = Macmini M4
OSX = 15..6.1
The ssd is an WD_BLACK SN850X NVMe SSD 4TB Internal SSD placed in an Acasis Swappable High-Speed SSD Storage & 10-In-1 Hub Docking Station same as the other external ssds I use.

BTW when placing any other NVMe SSD in that housing all works flawlessly. As does the specific ssd when copying ANY other file or folder onto it.
All SSDs used are AFPS formated

Any ideas anyone?

thx
 
I'd consider it to be an "incompatibility" between the SSD and the hub/docking station, and perhaps just "let it go at that".

What happens if you put the problematic WD SSD into a "standalone" nvme external enclosure, and connect it to the Mac that way?

You wrote:
"BTW when placing any other NVMe SSD in that housing all works flawlessly"

Somehow, I "see the solution" in your discovery above...

Fishrrman's "Mac Rule Number 2":
Use what works for you. Don't waste your time trying to use what doesn't.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.