External HD Issues

plactice

macrumors newbie
Original poster
Oct 17, 2016
4
0
Hi guys,

I've updated to Sierra when it came out and for some reason, my external HD is no longer useable.

I am using the 2014 Macbook Air and prior to updating, i had never any issues with using an external HD.

I have tried plugging that HD into my PC to make sure that the HD isn't the problem and it works there without any issues. I have also reseted my macbook's PRAM/SMC but it doesn't help. I have tried to manually mount the external via Disk Utility but it is just greyed out and unable to do anything else. I have reformatted the specific HD as well but doesn't work :(

I have also tried plugging a separate HD into my mac and it works just fine, just this specific HD won't connect at all.

Any help is appreciated,

Jason
 

chabig

macrumors 604
Sep 6, 2002
6,768
3,978
I have tried plugging that HD into my PC to make sure that the HD isn't the problem and it works there without any issues.
This is a clue. A Mac formatted hard drive shouldn't work on a PC. What else didn't you tell us about your hard drive?
 

plactice

macrumors newbie
Original poster
Oct 17, 2016
4
0
This is a clue. A Mac formatted hard drive shouldn't work on a PC. What else didn't you tell us about your hard drive?
like i said, prior to updating to sierra it worked perfectly fine. I'm not sure what else I've missed out - please do let me know if i can provide any other information ..

When it is greyed out, from the menu bar > file > is there unlock or mount as option?
mount is available, i can click it but it doesn't do anything - just remains idle
 

Floris

macrumors 68020
Sep 7, 2007
2,381
1,472
Netherlands
Sometimes it shows like it's not updating in disk utility, but the drive does appear on the Desktop.
Sorry if it doesn't have an effect on your drive.
 

HDFan

macrumors 68020
Jun 30, 2007
2,318
628
1. What type of HD is it? Firewire, USB2, USB3, USB-C, lightning .... ?
2. What size?
3. You said that it wouldn't mount, but your were able to format it. Where did you format it, on the PC or on the MAC?
4. If on the Mac then how did you format it? OS X Extended (Journaled), Case sensitive, MS DOS, MS Dos FAT ...
5. What kind of partition table did you use (GUID, Master Boot, Apple Partition)?
6. Same questions as 4,5 if you formatted on the PC
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.