External USB Hard Drive not showing up, after Yosemite update

AHHH HAA! I did get notifications some things were incompatible after the install but didn't recognize any of them. I was also told the app paragon? Will work to fix the drive read issues?

Old Toad, I think that if your theory were correct, that 3rd party software would have shown up in the folder marked "Incompatible Software" that was created when I installed Yosemite. (The driver for my Pen Tablet was moved there.) Either way, it's a serious bug that has devastating consequences for those of us who work cross-platform or need to share cross-platform. Rather than theories, we need solutions.

P.S. Sorry, that parting shot was not aimed at you; it's aimed at Apple.

II'm gonna try the paragon app when I get back and a few other things my geeks said and update after

Neonshez, my Time Machine works--it's a LaCie formatted for Mac (I thought it had to be formatted specifically for Mac to use Time Machine. Is that not correct?) I can't bring myself to press the button to return to Mavericks. Still hoping.

By the way (for others in this thread), my two dead hard drives are formatted FAT32, not NTFS. FAT32 was recommended for cross-platform sharing when the user/platform isn't predictable. I understood that F32 was also better on the Mac side--older Macs.

FW drives (LaCie 1TB Ruggeds, in my case) all automounting fine. But still nothing USB powered automounting in either socket. This is quite an oversight/****-up/anomaly.

That actually adds to the mystery. I have an older LaCie, so not connecting to my 2013 MBP with FW (don't have the cord to do it). I'm connecting it with the USB cord. Assuming you haven't, do you mind trying to do the same with yours?

NormHouser -- thanks for this prompt. Using a USB 3.0 cable provokes automount -- using 2.0 leaves my system cold (mid-2010 15in MBP, 2.66GHz Intel Core i7 etc.)

Now my USB 2.0 devices have started to automount again. I don't know what I've done since I last tried that may have made a difference, except plugged in a FW and a USB 3.0 device. The plot thickens, but also improves slightly...

Thank you!!! One of the hard drives now mounts. I switched back and forth between USB 2 and 3 a couple of times, switched devices a couple of times, restarted the computer a couple of times (with the hard drive attached), and then all of a sudden there it was. It mounts consistently with either connection. No luck with the second one, though.

Same problem. I did the trial versions of Yosemite and everything worked fine. The final version made my HDD disappear.

This will definitely work if your external device is working properly:

http://lifepluslinux.blogspot.in/2014/10/how-to-mount-ntfs-external-disk-in.html

And a MEGA plus point is that after this you will be able to mount NTFS partitions in write mode!! 🙂

If this doesn't work then there is a problem with your device. Type "diskutil list" in the terminal and see if your device shows up

Alseambusher, thanks for adding this to the conversation. I disagree with your assessment, however. Your referenced link says: "It is not possible by default to mount a NTFS External Drive in write mode on OS X since Mavericks.."

1. This entire thread is based on an upgrade to Yosemite. If the diagnosis clashes with user experience, the diagnosis is wrong. Please reference FVaughn1234's very very very very important post.

2. Given that, a diagnosis of "If this doesn't work then there is a problem with your device" is unfounded.

3. Even if your diagnosis were correct, and even if the fix worked, NTFS is not the only hard-drive format affected. In fact, based on experiences described in this thread, ALL formats have been affected.

4. You want Apple users to fix an obvious bug in the new OS by typing code--and then blame the user if it doesn't work?

Respectfully,

--Norm

Same here i had to plug /unplug a few times to get it running.

but i can end up burning my disk with such thing.

they have to fix this issue cause with any pendrive I'm having the same problem.

The problem is not related to 3rd party Apps.

I have an iMac 2010 and a MacBook Air 2013. Also I have purchased Paragon SW.

Even if don't install Paragon SW again, the normal scenario should be that both devices be able to mount and recognize the External HD/Pen Drives, etc with NTFS a least on Read only mode.

Ok, what happened really?

After updates both devices, MacBook Air recognizes al units perfectly -Read only mode- those that have NTFS FS, after install Paragon SW again, Write mode works perfect.

But.... I'm still fighting with iMac, directly didn't recognizes any external HD/Pen Drive, the CD-ROM Drive neither! just only SD port.

I can see the drives in Disk Utility and through X11 and some command lines, get access a least in Read Only mode, but guys is not a problem of your devices, Disk, 3rd party SW..... I don't know.

When I find the solution, will let you know.

Regards.

E

Update: A small Pen Drive of 1.GB Capacity, FAT32 FS works fine, Read/Write mode. I formatted it to Windows NT and the system left to recognize (expected) formatted again now with ExFAT, iMac recognizes it again.... the problem seems to be in Windows NT format, the really strange issue here is why don't recognize the CD-ROM drive?