Disk Utility Gives Differing Results...........

I used disk utility (Leopard, not from start up disk) to repair permissions and to verify the hard drive. Permissions repair worked fine (but v slowly), but verifying the disk brought up an error saying that the disk needed to be repaired. I therefore ran disk utility from the disk (ie holding c at startup etc....).
Running disk utility eventually resulted in green text saying that no repair of the disk was necessary.
I restarted, re-ran disk utility in Leopard and it still says the disk needs to be repaired. Onyx also says the disk needs to be repaired. I have run the extended hardware test, which said there are no problems.
Can anyone shed any light on why I am getting these different results and if I need to be worried???
Many thanks in advance!

There are a few important points to verify to ensure an external drive is bootable. Attach the external drive while started up normally. Run Disk Utility. Select the external drive in the left sidebar and look at the info at the bottom of the window. To be able to install Leopard on it, the Partition Map Scheme must be GUID Partition Table.
If it is GUID Partition Table, you can start up from the Mac OS X installation disk and select it as the target for installation. If the drive is not empty, the data already on it will not be affected, but you should probably back it up if it is valuable. After the installation, start up from the external drive and run Software Update to get all the updates. You will have to run Software Update a few times to get all the inter-dependent updates.
If it is not GUID Partition Table, you will need to re-partition it and change it to GUID Partition Table using Disk Utility's Partition tab. In this case, the drive will be erased.
Once you have done the installation and all the updates, you can run Disk Utility while started up from the external drive and select the internal drive for the Repair routine. Since the Repair process should be identical, hopefully the results will be consistent.

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