IMac stopped recognizing WD Passport external hard disc

Hello everyone, i just got a new iMac, i connected my WD passport external disc and transferred several files. It was working perfectly and suddenly without me noticing when exactly (in a time window of 8 hours) , iMac stopped showing the hard disc on desktop. I went on disc utilities, nothing. I logged in from a test user i created still nothing. I rebooted in safe mode, again nothing. I even unplugged iMac from the power source for 15 sec then turned it on again after sec. Nothing at all.. Any idea of what to do?
Ps. the hard disc works like a miracle with my MacBook Pro
Thank you all in advance

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My iMac stopped to recognize an external hard drive. What might be a reason?

My iMac stopped to recognize an external hard drive. What might be a reason?

Hi,
This happens often because the processes that run over the MacOS, but the power was not enough to power your device. Actually this happens with external hard drives on any platform. Sometimes the USB port is not enough or even energizes permissions MacOS fumble.
When your computer finishes starting up, choose Disk Utility from the Utilities window and select your external drive and click in First Aid tab and repair disk.
Good Luck,
Eduardo

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All suggestions appreciated.

Answered my own question. Working now. Connected directly to computer USB and ignored it for a couple of hours and now it is visible on the desktop and appears to be working.

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My iMac hard disc is getting full so I bought an external hard disk. I changed my iTunes folder over to the external hard disc without any trouble and removed the old iTunes music folder as per directions. After that iTunes played fine, the next day when I turned on my iMac the iTunes music folder had reverted back to my iMac's hard disk, and the external hard disk no longer shows. I opened Disk Utility and the external disk shows there but when I try verify disk or repair disk i get "FIRST AID FAILED, Disk Utility stopped repairing “disk1s1” because the following error was encountered: The underlying task reported failure on exit."
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I think what you need to do is get a second external hard disk to attempt to recover data off that drive before you do anything else by using Subrosasoft Filesalvage to do the recovery.
External drives are best used as backup. If your itnernal hard drive is becoming too full, you need to know how to better manage your data, or get a larger internal hard drive. My FAQs* here should help you:
http://www.macmaps.com/backup.html
http://www.macmaps.com/diskfull.html
Good luck!
- * Links to my pages may give me compensation.
Message was edited by: a brody

Music stored on external hard disc not found after re-boot

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I followed other comments on the forum and succeeded. Thanks! -Migs

External hard disc "disappeared"!

Hi,
I upgraded to Lion on my 2.66GZ Intel Core 2 Duo about a month ago. After 3 weeks my new Iomega external hard disk which I used with Time Machine was no longer recognised or appeared as a device in Finder. The Iomega hard disc (top of the range model with a 5 year guarrantee) appears to be working - or at least it is making a whirring sound and the "ON" light is glowing - but my Mac can no longer find it. I plugged the same Iomega into a PC and the PC will not recognize it either.
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See Pondini's Tips for starters.

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Dear all,
I have recently written a question regarding a problem with my user account; in this question I have described that I have my data for my user account on an external hard disc (USB2 hard disc), and that all data in this account seemed to be deleted one day (in fact, it was simply set to a wrong path, see below); user V.K. has helped me out of the problem - the problem could be solved by renaming the external hard disc and setting the path to my user data folder in the "user account" settings to my old folder on the renamed disc; You can find our discussions here: http://discussions.apple.com/thread.jspa?threadID=1513799&tstart=0 By the way, I use OS X 10.5 (newest version).
Now, several months later I find myself in the situation that the problem returns frequently, although I do not yet see regularities or the reason; each time the described renaming-procedure helps, but anyway it is annoying, and some programs who have data on my user account folder (such as Linotype FontExplorer X - latest version!) even fail to notice the change and have to be very reset with lot of effort.
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With kind regards and greetings from Berlin,
Björn

Aside from starting over, losing whatever you've done on the new machine, see Pondini's Transferring files from one User Account to another. If you haven't done much and can afford to lose that data, I suggest starting over, following the steps in Pondini's Setup New Mac guide. That should result in just one user account.

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Hi,
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Emma1609 wrote:
Hi,
hi emma, and welcome to discussions
Once the external HD is turned on my Time Capsule is not longer recognized. I can't connect to Time Capsule and make any backups. It is also no longer appearing in the Airport settings.
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I meant reinstalling the operating system.
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If you have any further questions, please don't hesitate to ask.
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The iMac doesn't recognize my external hard disk

My iMac doesn't recognize my external hard disk. The iMac also keeps a DVD inside. It doen't throw it out despite "eject".

Sounds like you might need to make that call. In the meantime here are a few of things you could try that may help:
To eject the disk try a restart holding down the mouse button - hopefully it'll eject.
If you are running either Mountain Lion (10.8) or Lion (10.7) try booting into the Recovery HD:
Restart holding down Command+r. At the screen with 4 choices choose Disk Utility and then select Macintosh HD and click on repair disk. If it fixes anything click on repair disk again until you get a clean pass. Restart as normal from the Apple menu.
If you are running an earlier OS you would normally carry out this process by putting the grey restore disk that came with your Mac in the Disk drive and restarting holding down the C key. Choose your language and at the next screen from the menu bar select Utilities>Disk Utility and then follow the above instructions (I realise you won't be able to do this if you have a disk stuck in the optical disk drive).
Try an SMC and PRAM reset: https://discussions.apple.com/docs/DOC-3603
Try a Safe Boot: Restart holding down the shift key until you see a grey progress bar. Once it's booted restart as normal from the Apple menu.
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MacBook Pro is not recognising my WD my passport external Hard drive

PLEASE PLEASE HELP
I have 200GB+ of data on my HDD and I DO NOT WAT TO FORMAT IT
I partitioned my WD my passport external Hard drive on Mac through Disk Utility
i then plugged it in to a windows XP computer
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right click My copmuter > Manage > Disk management > then i right clicked on the hard drive's name > convert to GPT disk
i though by doing that windows will recognise it .. it didnt
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PLEASE if someone knows a way to fix this i'd really appreciate if you would tell me
i have really important documents on that hard drive
Thanks you in advance

I have fears that you data may be gone.
Did you try to see if you could access data on the Windows PC?
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Ciao.

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There is also a chance that the cable may have a poor
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IMac stopped recognizing WD Passport external hard disc

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