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will0407

macrumors 6502a
Original poster
May 20, 2006
608
56
For the last few months I've had a really irritating problem with my USB-C sticks (Kingston mico duo 3c). Between me and my family, we have about 6 of them which all used to work fine on all our macbooks (there are 4 of us with macbooks).

When I plug the stick in, it doesn't show on the desktop. It doesn't show in disk utility. BUT, when I pull it out, the macbook makes the sound to indicate something has been removed (the same sound it makes when you plug the charger in). When the macbook is in this state, none of the sticks work.

A restart fixes it every time- I was hoping the 10.11.5 update would fix things but it hasn't. So at the moment, if I want to transfer anything to USB, I have to restart my laptop which is very annoying

I've done PRAM and SMC resets but to no avail. Has any one else had this issue? Or resolved?
 
Last edited:

objektør

macrumors 6502
Nov 25, 2014
273
24
At home
For the last few months I've had a really irritating problem with my USB-C sticks (Kingston mico duo 3c). Between me and my family, we have about 6 of them which all used to work fine on all our macbooks (there are 4 of us with macbooks).

When I plug the stick in, it doesn't show on the desktop. It doesn't show in disk utility. BUT, when I pull it out, the macbook makes the sound to indicate something has been removed (the same sound it makes when you plug the charger in). When the macbook is in this state, none of the sticks work.

A restart fixes it every time- I was hoping the 10.11.5 update would fix things but it hasn't. So at the moment, if I want to transfer anything to USB, I have to restart my laptop which is very annoying

I've done PRAM and SMC resets but to no avail. Has any one else had this issue? Or resolved?

I have the same problem with my Seagate hdd and my usb c flash (Transcend 64 gb). No solution yet.
There is another thread on this issue

https://forums.macrumors.com/threads/problem-with-external-hard-drive.1972405/#post-22913607
 

Eric8199

macrumors 6502a
Feb 27, 2009
789
159
Same problem here. Very annoying but happy to see others are having this issue too. Now I know it's not just my machine. Seems as if it's a software issue.
 

happyslayer

macrumors 65816
Feb 3, 2008
1,013
557
Glendale, AZ
Hey all. I had this problem as well. I found that if you install any of the beta/developer builds my USB-C flash drives will not work. I have worked a bit with Apple developer support and apparently it may have something to do with USB3. The dev builds break USB3. If you use a USB2 adapter and plug the stick in through that (assuming it is a USB-C combo USB-A type stick) it will work. The only solution is to do a system restore, either to a previous "vanilla" build of 10.11.4 or 10.11.5. Then restore your data/apps/etc from Time Machine. You can also just boot command-R and choose restore from Time Machine. (I have done this both ways a few times over the last month.) This happened with any of the 10.5 betas and now the new 10.6 beta. As soon as I am back to running the "vanilla" non-dev build my 4 different USB-c sticks work again. (Sandisk 32GB, Patriot 32GB, Kingston 64GB and a Sony 32GB - all are the combo type sticks with USB-C on one side and USB-A on the other.)

If you're not on the dev build, I am not sure. Maybe try a backup and system restore just in case. Also, if possible, maybe another brand. I found the Patriot 32GB a Frys Electronics a few weeks ago for $13.00.

Good luck!
 

will0407

macrumors 6502a
Original poster
May 20, 2006
608
56
I may try a command-r restore and then restore my time machine back up. really starting to frustrate me now. Only ever updated the OS using direct download from apple, no betas etc so no reason why this should be happening.
 

will0407

macrumors 6502a
Original poster
May 20, 2006
608
56
After a CMD-R restore and then time machine restore, the problem persists. annoying is an understatement!
 
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