Improperly ejected external hard drive is not displaying on computer...not even in Disk Utility

My external hard drive has been repeatedly ejected improperly and now it is not displaying on my computer, not even in disk utility. How do I re-mount this external hard drive? In the past when this has happened, all I had to do was go to Disk Utility or use DiskWarrior to fix the issue but now it won't even show up in either of these apps.
Any help would be appreciated
2008 MacBook Pro 10.9.3, WD My Studio 1 TB External HD

From the menu bar, select
 ▹ System Preferences ▹ Energy Saver ▹ Power Adapter
and uncheck the box labeled Put the hard disk(s) to sleep when possible, if it's checked.
If the drive has more than one interface (USB, FireWire, Thunderbolt, eSATA), try one of the other interfaces.
Check that the data cable is securely inserted at both ends.
Try a different cable.
If you're connecting the drive through a hub, connect it directly to a built-in port on the Mac.
If you're connecting it directly, try a different port.
Disconnect all other devices on the bus, or as many as possible.
Test the drive with another Mac. Test another drive with this Mac.
If the drive is bus-powered, but has an AC adapter, connect the adapter.
Start up in Recovery mode and launch Disk Utility. Is the drive recognized?
Start up in Safe Mode and test.
Reset the NVRAM.
Reset the System Management Controller.
If the drive doesn't work under any of the above conditions, and if another drive does work with the same Mac, then the drive has failed. You may be able to salvage the mechanism by removing it from the enclosure and installing it in another one, or in a drive dock.

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Sorry but I am a bit unclear..
The drive is plugged into a Mac and the share is from this Mac to the network?? Or is the external drive plugged into the Time Capsule?
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Unless you use Remote Access of some sort to take over the local computer you really cannot control shares that are offered from another computer.
I am not sure I have answered your question though.
What are you trying to achieve.

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Forgot to eject external hard drive-won't mount, doesn't show

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Hi folks. Weird problem here.
I have an iMac (27-inch, Late 2012, 2.9 GHz Intel Core i5, 32 GB 1600 MHz DDR3) with a regular 3.5mm line-out jack going from the audio out port to an external speaker/subwoofer system.
Whenever my mac is on and I have forgotten to power up the external speakers, once I flick the switch on the system all the external Hard Drives attached to my mac eject (750GB WD USB2, 4TB Seagate USB3, 5TB Seagate USB3).
Normally they reappear after a minute or so but sometimes they don't and I have to restart in order to have them show up.
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Anyone else have similar problems or know of a possible cause?

Hi folks. Weird problem here.
I have an iMac (27-inch, Late 2012, 2.9 GHz Intel Core i5, 32 GB 1600 MHz DDR3) with a regular 3.5mm line-out jack going from the audio out port to an external speaker/subwoofer system.
Whenever my mac is on and I have forgotten to power up the external speakers, once I flick the switch on the system all the external Hard Drives attached to my mac eject (750GB WD USB2, 4TB Seagate USB3, 5TB Seagate USB3).
Normally they reappear after a minute or so but sometimes they don't and I have to restart in order to have them show up.
I am beginning to think that it is related to an issue I have had ongoing for a number of months (since upgrading to Yosemite actually) 27" iMac randomly reboots whereby I would have messages appearing throughout the day saying "external Disks have not been ejected properly", and then having 2 HD's terminally fail on me.
I have seen other threads talking about glitches with their audio when using audio in/out devices but I have seen nothing about hard- drives being ejected.
I suspect that the Headphone/optical digital audio output (minijack) is susceptible to power surges, such as a connected device being switched on and this somehow causes the ejection.
Anyone else have similar problems or know of a possible cause?

Improperly ejected external hard drive is not displaying on computer...not even in Disk Utility

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