Why is my External Disk Drive immediately Ejected?

I have an external hard drive that I've mounted many times onto my iMac running OSX 10.9.2. Now all of a sudden when I try to mount it I get the error message: "Disk not properly ejected". This even when I just connected it. When I tried again the disk image shows up for a second then I get the error message again. I connected the drive to my laptop and no problem.
I tried to run disk utilities but the drive doesn't show up.

Do 2-3 SMC and PRAM resets with NO peripherals attached and then attempt to connect the EHD. Your cable may need replacing or there could be other issues.

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External Disk Drive not ejecting

I have a MacBook Air which doesn't have a disk drive built in so I bought an external one. I put a DVD in it, it all worked perfectly normal, once finishing the DVD I shut down the computer like I would normal but I forgot to eject the disk. Its never been a problem before but now it wont eject the disk thats in there. It makes sounds that its going to but it doesn't, still plays the disk thats in there as well. Someone please help me fix this problem!

Props to Kappy.
Five ways to eject a stuck CD or DVD from the optical drive
Ejecting the stuck disc can usually be done in one of the following ways:
1. Restart the computer and after the chime press and hold down the
      left mouse button until the disc ejects.
2. Press the Eject button on your keyboard.
3. Click on the Eject button in the menubar.
4. Press COMMAND-E.
5. If none of the above work try this: Open the Terminal application in
      your Utilities folder. At the prompt enter or paste the following:
        /usr/bin/drutil eject
If this fails then try this:
Boot the computer into Single-user Mode. At the prompt enter the same command as used above. To restart the computer enter "reboot" at the prompt without quotes.

Why do my two external hard drives require "ejection" prior to shutdown?

Why do my two external hard drives require "ejection" upon shutdown?

Problem solved. I had plugged in my external hard drives into a USB card. I switched my two printers to the USB card and plugged in the two hard drives into the computer's USB outlets and now NO improper eject messages. What a relief!!! Thanks again.

TS1963 Migrating from Time Machine onExternal Disk, Why won't Migration Assistant see my USB Connected external disk drive?

I had to format my internal disk drive on my MacBook Pro, and reload Mountain Lion 10.8.3. The startup assistant could not see my external disk drive with the Time Machine backup files. After many tries I told it to skip restoring the files and let it boot up. I was able to see my 1 TByte external drive and could see the Time Machine files using Finder.
I started the Migration Assistant and told it to migrate from Time Machine Files on an external drive. It also did not see the backup drive. The only drive icon it showed was the Macintosh HD (my internal drive).
Isn't it supposed to show you the drive you are moving the files from? I tried starting it and it looked like it was going to try to migrate the files from the internal drive (to where I don't know, back to itselfl?) Or do I just not understand. Is it seeing the external drive, without identifying it (in the Migration Asst,)?
Really looks like it is going to back up the internal HD with files that are on the internal HD and not from Time Machine.
I need to restore my files and have been told I need to do so using Migration Assistant and not Time Machine.
Help pleae and soon, need to get my taxes finished!
Thanks!

I'm surprised that no one replied to this. But I learned a few things that may be helpful to some of you with this same question.
When you restore data from an external disk drive with Time Machine files on it. As you move through the dialog (in either System Startup or in the Migration Assistant) it will ask if you want to restore from an external disk with Time Machine files. If you select this option, it will show you only one Icon. You will expect to see your external disk drive listed as the source of the restore. The icon that is shown will look like your ilnternal drive and will be labeled something like Macintosh HD. That is not your internal drive, but is your backup drive. It is labeled the same as your internal disk drive and it is telling you that you have found the backup for your internal disk drive.
Would be nice if Apple would put a note of explanation about this as part of that dialog. I wasted several hours trying to make it work Finally I took a chance and selected the drive shown and it did restore my system. I ended up with two users since I did it from Migration Assistant. Had I done it from the System Startup, there would only be the one user.

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Probably pretty much any one would as long as it can be connected to your Macbook with USB or Firewire or what it has. Read the fine print when it refers to system requirements. In most cases that refers to bundled software which you probably don't need. Usually if there's OS limits for Macs it's something like you must be running OSX 10.2 or newer.
I would start looking on a site such as www.mac-sales.com which caters for Mac users so you can be assured their stuff is compatible. You can get something pre-assembled or you can buy an enclosure and a drive separately and assemble them yourself. My preference would be for one where the drive is powered independently, though that does tie you down to an outlet. On the other hand with an external drive you're not going to be walking around the room.
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I have been trying to update my software to Snow Leopard but I am using an external disk drive and when I try to install the software I get the message "The application 'Install Mac OS X' cannot be used from this volume". Is there any way to fix this problem?

Are you booting your computer from an external drive? If so please say why? How are you trying to upgrade to Snow Leopard? Do you have the 10.6.3 retail Snow Leopard DVD? On what drive are you trying to install Snow Leopard? Are you doing this?
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If the drive is OK then quit DU and return to the installer. Proceed with installing OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install Mac OS X 10.6.8 Update Combo v1.1. Then use Software Update to download and install any other needed updates for Snow Leopard.

I have an iPad 2 and iPhone 4 and for them I use I cloud I have also 1 pc windows and at work place I use windows pc ; until now my files are stored on an external disk drive could' I use iCloud to perform the backup of my external disk drive ? Thanks

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Loredano

These are the options you have.
Budget $1299.
http://www.apple.com/macbookair/
http://www.apple.com/macbookpro/
Best.

How to look at movies with IPAD3 using Airport express and external disk drive (USB connexion to Airport Express)

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Shoudl I use ICloud instead or another way ?
I have not tried iCloud for this...and understand that it is mainly for your backups. These link might help:
http://www.apple.com/icloud/get-started/
http://www.apple.com/icloud/setup/
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Just need to be sure your TC is the new AC model??
And the OS on the computer is Lion?
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Give us the full picture of the network.
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Alas, one issue remains: I'm unable to authorize the contents via the installer disk in the MacBook's disk drive. Perhaps it's because my computer reads the icon as an external hard disk (see attached), rather than as a DVD installer icon. Any hunches or suggestions?

I just purchased an external disk drive to store my pictures. I want to keep the last 12 months of pictures on my iMac and move the rest to the new external drive. As new pictures are added I want them to be put on the iMac internal drive. How?

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Thanks.

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Make sure the drive is formatted Mac OS Extended (Journaled)
1. Quit iPhoto
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Why is my External Disk Drive immediately Ejected?

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