Error code -50 hard drives won't eject

I am using three G-drives, a 4TB RAID drive, and two 3-TB G-drives. On both my Macbook and iMac I am having problems ejecting them. I get the message
"The disk wasn't ejected because one or more programs may be using it." even when all the programs on the computer are closed.
I also get error code -50
"The operation cannot be completed. An unexpected error occurred (error code -50) when I try to create a new folder or move files on 2 of the drives.
At first I thought the problem was my iMac which recently had it's internal drive replaced, but I have been using the hard drives with my Macbook and am getting the same problems so now I think it's a problem with the drives, but since it is happening with all 3 I'm not sure what's up. I ran disk utility and verified the discs and it said everything was ok.
All three drives are used to store video files and FCP 7 media for editing.
I cannot find any information on what could be causing this and would appreciate any suggestions.
Thanks.

Welcome to Apple Discussions!
Usually this is indicative of a damaged directory. However, sometimes it is indicative of a dying hard drive,
or damaged peripheral interface.
Since you say all of your critical data is on the drives, I'd purchase Prosoft Data Rescue and another empty Mac formatted drive you can recover the data to and see if that is successful.
If that is not, follow my directory repair FAQ:
http://www.macmaps.com/directoryfaq.html
In the future always make sure you have at least two copies of your data at all times as my backup FAQ explains:
http://www.macmaps.com/backup.html

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Message was edited by: larrygal316

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Gryyphyn, out.

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Message was edited by: stewiesno1

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Hello maccynicwhoalwayshasmacs,
Thanks for the question. After reviewing your post, it sounds like trouble with an external HD mounting. I would recommend that you read this article, it may be able to help you resolve or isolate the issue.
USB and FireWire Quick Assist
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http://docs.info.apple.com/article.html?artnum=42642
reset-nvram (press Enter)
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In Disk Utility you need to see a volume or partition in addition to the drive.
If all you see is the drive, then when you ejected it you proably corrupted the volume or partition on the drive.
If that is true then your chances of getting anything back are slim at best.
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I'm trying to run a backup, but my hard drive won't appear on my desktop. I see it in Disk Utility, so I know it's there...
...any suggestions?
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STEP ONE - Confirm that the drive is being seen by the system
Click the Apple icon and select About This Mac.
Click More Info.
Select the Drives and Volumes tab.
If the Iomega Hard Disk drive is not listed under the USB/FireWire arrow, proceed to STEP THREE.
If the Hard Disk drive is listed, continue with the next step.
STEP TWO - Format the Hard Disk drive to Mac HFS format
The Iomega Hard Disk drive is factory formatted to FAT32 for maximum compatibility. If you have not reformatted the disk or the disk is formatted to FAT32:
The disk may mount very slowly in OS X if the disk is FAT32 formatted.
Mac OS X will not mount any DOS (FAT32) partition larger than 128GB. For more information, please check the Apple® Web site at http://docs.info.apple.com/article.html?artnum=107483
Warning: Erasing your Hard Disk drive will erase all of the information stored on the disk. If possible, back up your data before erasing the hard drive. Mac formatted disks are not cross compatible with other operating systems, such as Windows®, without the purchase of additional third-party software.
Double-click the Mac hard drive icon.
Double-click the Applications folder.
Double-click the Utilities folder.
Double-click the Disk Utilities icon.
Highlight the drive in the left window.
Click the Erase tab.
Select Mac OS Extended.
Click the Erase button and then click Erase from the confirmation window.
If the Hard Disk drive now mounts, you are ready to use the drive.
If the Hard Disk drive does not mount, continue with the next step.
STEP THREE - Are the Mac OS X drivers detecting the drive properly?
The Iomega Hard Drive may not mount if you are using Mac OS X versions under 10.1.3. If you are not using Mac OS X 10.1.3 or higher, please visit the Apple® Web site at http://www.apple.com/macosx/ for information on getting the latest version.

Error code -50 hard drives won't eject

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