External hard drive not found anymore after wrong disconnection?

First time there was no problem and used external hd. After disconnecting the wrong way the mac can't recognise the exteranl HD anymore.
On my other pc it works fine. What happend and how to restore?
Dirk

have you shut down or restarted your computer since last you pulled out the hard drive?
are you connecting it via firewire or usb
go into disk utility when you have your HD plugged in and you will see it there, right click it and hit mount. it should come up.
if you are using firewire, or usb, you might want to not just pull them out without first ejecting it. I've heard, specifically with firewire, that this could fry your whole logic board.

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Do not attempt to perform a permissions repair. That is not related to the problem you are experiencing.
Do you have that external hard drive set up as a single partition or multiple partitions? If multiple partitions, are all the partitions failing to mount?
Regardless, you are going to have to move to a more robust (and expensive) method of recovering your data than is available with the tools provided by Mac OS X. Your best chance of recovering your data without spending an inordinate amount of money is DiskWarrior:
http://www.alsoft.com/diskwarrior/
If the data is very valuable to you and you really really can't lose it, then you might care to try a profesional data recovery laboratory. It is extremely expensive – thousands of dollars whether they are successful or not. There are many good labs; here's one:
http://www.datarecoverylabs.com/
In the future, you simply have to learn to keep redundant backups. Keeping active files on the same device as your backups makes no sense at all; you might as well not bother creating the backups if you're going to do that. Read here for good advice on backups:
http://www.mac-essentials.info/?page_id=213

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Cheers!

Your Finder Preferences may need to be modified.
Was this HDD used with your Mac previously or with a PC? If the latter, then the format needs to be addressed. If you reformat it for Mac or a common format for both Mac and PC, all user data will be erased. You may have to copy the data to another HDD or use an application such as Paragon:
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Ciao.

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External hard drive not recognized... help please.

okay, well here is the story:
my iBook G4 had its stock 30gb hard drive in it and it was running extremely low on space. so i figured i didn't want to carry around an external hard drive, therefore i would buy an internal hard drive an install it. so i purchased a new 2.5" 80gb hard drive and called up the local apple store. they told me that although it was under warranty, that it did not cover hard drive installation. so i looked it up online and found step by step instructions to install the hard drive. so after lots of hard work and many screws, i installed the new hard drive successfully... but i still had this perfect 30gb hard drive. i thought maybe to save a few bucks i could turn it into a usb external hard drive. i found an enclosure for the hard drive and a usb 2.0 cable and plugged it into my ibook. it was recognized and everything. i put some files on the external hard drive and transferred it to another mac. this is where the trouble started. i plugged the hard drive into a PowerMac G4, and it was not recognized... so i tried it on a different mac. this time on a PowerBook G4, but no luck. this issue has been troubling me for a few weeks. but then i tried it on a similar iBook G4... and it was recognized. but i don't know why it was only recognized only on the iBook G4 (not the same iBook G4 it was pulled out of) and no other macs.
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I can walk you through formatting the hard drive:
1. Hook it up to an iBook that recognizes it.
2. Go into your Applications folder, then scroll down to Utilities. Open Utilities and scroll down a bit and you should see Disk Utility. Double-click.
3. On the left side you should see your internal hard drive and your external one. Each hard drive will have a sub-catagory with the partition indented.
4. Your external hard drive will probably be the second catagory. Click it.
5. In the center-top you should see the tabs First Aid, Erase, Partition, RAID, and Restore. Click the Erase tab.
6. You should see Volume Format: and then a drop down menu, and Name: and a text box. Type in the name you want the external hard drive to be named.
7. In the drop down menu, select Mac OS Extended (Journaled).
8. Then, simply click Erase, watch the progress and it should be good to go!!
Hope I helped you out. Oh, and it might be the enclosure...and also what OS's? Since it's USB it is probably using a USB Mass Storage driver. Mac-wise, if formatting doesn't help, I would get a FireWire enclosure because FireWire is much faster than just USB 2.0. Oh, thats nother thing...Is the enclosure Hi-Speed USB? If it isn't, I would definitely get a FireWire one...If it is, the PowerMac G4 doesn't have Hi-Speed so you're not taking full advantage..Just some insight
iBook G4 Mac OS X (10.4.3) 512 MB Ram, CD-RW Combo Drive, 40 Gig HD, bought in October of 2005...
Message was edited by: Hilary_Rose

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External hard drive not found anymore after wrong disconnection?

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