New Prpblem with Repairing disk

When one of my apps ( from an external HD ) wouldn't open, I ran Disc Utilty on this HD and got the following message:
*Repairing disk failed with error Could not unmount disk*
Can someone explain what this means, and suggest a course of action to remedy this ? Yesterday, I installed a new part to this programme, though I ran Disc Utilty afterwards and everything was OK, and i had the programme up and running without any problems.
Thanks, SeaDream

You were booted from the HD and repairing the external? Usually, when I get that message, I just try again and it unmounts. DU can't do repairs without the disc being unmounted. That's why the Repair button on the drive you're booted from will be dimmed and unavailable. Very crude medical analogy: like disconnecting your heart and trying to work on it without having another heart in its place to keep you alive.

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When I run Repair disk permission from Disk Utility I get these messages with warning. Why do I get them, and how do I fix them?
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http://support.apple.com/kb/TA21041?viewlocale=en_US
You did the right thing by asking first - good luck with Snow Leopard.

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Open up Terminal.app (under utilities) and type "diskutil list" without the quotes. This is the command line version of Disk Utility. If the external drive doesn't show up at all, then it's likely not connected properly, not getting power, or just plain dead. If it shows up with only a devce name like disk0s16 but no volume it means the drive is seen, the OS just can't make sense of it.
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If the unit isn't showing up, as per step 1, try a different USB port. More importantly with your unit, try it on another side of the unit if possible. If you read the book I referenced above, some of those units have I/O boards that are separated from the logic board. If the cable from the logic board to the I/O card goes bad or has problems, which isn't all that uncommon, some or all of the ports on the I/O card may appear to be bad as well. If you use a USB port on another side, it would be routing out of a completely different I/O path, so that's a potential problem.
If the drive is only seen with a device name such as disk0s16, it's likely either the index files are corrupt beyond Disk Utility's ability to see them. The only thing that I think would help would be a product named DIsk Warrior, but I can't guarantee that.
Disk Warrior can be found at:
http://www.alsoft.com/diskwarrior/
The company that I linked in the first link above also makes a product named Scannerz that does HD and system testing. The Scannerz/Disk Warrior combination make a good pair because the complement each other....Scannerz does what Disk Warriror can't and Disk Warrior does what Scannerz can't. However, at this point I'm not too sure getting a tool like Scannerz would be of much use because it sounds like the damage has already been done.
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Hello,
When i'm trying to veryfy my disk i keep getting this error message:
Verifying volume “Macintosh HD”
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Checking Extents Overflow file.
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og hierarchy.",0)
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New Prpblem with Repairing disk

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