after update to Yosemite my external HDDs are no longer recognized

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air_7up Author

Level 1

0 points

after update to Yosemite my external HDDs are no longer recognized

hi,

after a recent update to OS X Yosemite,

my WD external HDDs are no longer recognized (all Mac formatted und fully functional).

They are three different types and they neither show up in Finder or in the disc utility.

Tried Google without luck - only saw that thousands of users have the same problem.

Is it solvable or should I start thinking about undoing the update?

Thank you in advance!

Model Name: MacBook Pro

Model Identifier: MacBookPro6,1

Processor Name: Intel Core i5

Processor Speed: 2.53 GHz

Number of Processors: 1

Total Number of Cores: 2

L2 Cache (per Core): 256 KB

L3 Cache: 3 MB

Memory: 8 GB

Processor Interconnect Speed: 4.8 GT/s

Boot ROM Version: MBP61.0057.B0F

SMC Version (system): 1.57f18

MacBook Pro, Mac OS X (10.7.5)

Posted on Jun 2, 2015 1:10 AM

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Answer 1

PJRS

Level 3

657 points

Jun 2, 2015 2:09 AM in response to air_7up

Hi air_7up is the firmware up to date on all your drives?

This would be the first thing to check.

Secondly is the drive listed in Terminal?

Open Applications/Utilities/Terminal and enter the line below at the prompt then press return.

diskutil list

If the drive is available it will show up in the list created in terminal

Hope this helps.

PJRS

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Answer 2

OGELTHORPE

Level 9

57,305 points

Jun 2, 2015 2:58 AM in response to air_7up

Test by taking out the bare drive and install it into a non-WD enclosure. If it is then recognized, contact WD technical support.

Ciao.

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Answer 3

air_7up Author

Level 1

0 points

Jun 2, 2015 4:05 AM in response to PJRS

yes, the HDDs are all fine and up to date, only not running on this MacBook after Firmware update. an other machines no problem.

Terminal test does not show drives.

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Answer 4

air_7up Author

Level 1

0 points

Jun 2, 2015 4:06 AM in response to OGELTHORPE

this is not a WD problem, tried with Toshiba HDD as well...

again: all HDDs ran fine before the OS update and continue to be flawless on other Macbooks...

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Answer 5

air_7up Author

Level 1

0 points

Jun 2, 2015 4:16 AM in response to air_7up

found the following suggestion with Google:

disconnect all USB devices / plugs (including Cinema Display USB hub), restart the Macbook and connect the drive.

it works one time. the Cinema Display USB hub can be reconnected and the drive continues to be there.

but other new drives will not be recognised - until you disconnect the Cinema Display again...

so - it looks like the Cinema Display USB hub prevents HDDs from being recognized on the main USB ports.

just FYI - I never connected the HDDs via the Cinema Display - always directly to the MacBook USB ports...

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