My Macbook Pro doesn't recognize my external hard drive

I had my external HD attached to my MBpro when I attempted to empty trash. The trash window showed it emptying thousand upon thousands of files (way more than was in the bin) and had a negative sign in front of the number of items being deleted. I canceled the emptying, but now the computer won't recognize the HD. It appears in Disk utility but not in desktop or sidebar. What happened and how do I fix it?

In Disk Utility, try using the Mount button in the top menu.
Disconnect the external drive, turn it off, wait about 1 minute, reconnect, and turn it back on. While waiting, restart the computer.
Disk Utility – Force Mount Disk

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For starters try a PRAM reset.
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(0) Start by making a current backup if you do not already have one.
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(5) Repair your startup disk: http://docs.info.apple.com/article.html?path=Mac/10.7/en/mchlp1718.html
(6) Reinstall Lion and apply the 10.7.2 Combo Update: http://support.apple.com/kb/DL1459
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Message was edited by: EZ Jim

My MacBook Pro is not recognizing my external hard drive. The hard drive is listed in disk utilities but an icon does not pop up and I cannot access the data. Is there any way to resolve this?

My MacBook Pro is not recognizing my external hard drive. The hard drive is listed in disk utilities but an icon does not pop up and I cannot access the data. Is there any way to resolve this?

WE know Disk Warrior is more reliable, hence more useful, and should be in any disk mechanics toolchest.
For the record, I don't know anything of the kind. I have yet to see evidence that Disk Warrior is useful at all.
What I do know is that you seem to take every opportunity you get to promote it in these forums. Do you work for Alsoft?
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http://www.alsoft.com/DiskWarrior/
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Drive Genius…
http://www.prosofteng.com/products/drive_genius.php
TechTool Pro…
http://www.micromat.com/index.php?option=com_content&task=view&id=31&Itemid=83

My MacBook pro does not see my external hard drive

I have an external hard drive La Cie (Porsche 250 gb).
Once I disconected it incorrectly.
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'Eject; Initialize or ignore'
I also tried to verify the disk with 'Disk Utility' but it doesn't work
Does someone know how I could access to the disk without formatting it?
Thank you
Lorenzo

I also tried to verify the disk with 'Disk Utility' but it doesn't work
I assume that mean your can "see" the external from DU? Normally, if DU can see the disk but can't repair it, you'll need something stronger like DiskWarrior. DW's strength is in recovering and rebuilding directories, the cause of most drive problems.
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Time Machine doesn't recognize my external hard drive

My external hard drive is no longer recognized by my iMac. I have had this problem before and had to repartition the drive. There is not a drive that is available when I go into Time Machine preferences. Any ideas?

If you completely repartitioned the external hard drive, you may need to Erase & Reformat each Partition on the drive now in order for them to be recognized. You can do that in Disk Utility.

My Macbook Pro doesn't recognize my external hard drive

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