External HD not working after 10.6.3 update

Hello,
My wife and I both installed the 10.6.3 update on her computer (Macbook 2.4GHz Intel) and mine (Macbook Pro 2.6GHz Intel). Following the update, neither of us is able to access her external (USB) hard drive - an Iomega Select 320Gb model. My two Western Digital drives appear to be working fine.
The following error message is displayed:
"The disk you inserted was not readable by this computer"
The three options provided are "Ignore, Eject or Initilize". I presume the latter option would wipe the drive, which we are not keen to do!
Any suggestions would be much appreciated!
Thanks,
Graeme.

gaattc wrote:
Thanks for this. When purchased [recently] the drive was indeed Windows formatted. However, I immediately reformatted it to Mac Os Extended (case sensitive, journaled) so this is extremely puzzling.
Did you also change *Master Boot Record* to either GUID or *Apple Partition Map?*
When I click on the Erase tab for that drive, it also defaults to Windows even though it wasn't.
Any chance of recovering this data, to your knowledge?
Doubtful. You need specialized +Data Recovery+ software, or a service that performs the function. It's not cheap, and there are no guarantees.
The app mentioned here most often is +Data Rescue 3,+ but I haven't used it myself, so can't recommend it over any of the others.
Some of these have a free "trial mode," that will tell you if there's anything to be recovered, and perhaps recover a single file. For more, you have to pay the $$.
You'll also need another drive to receive anything it can recover.
Look for apps or services under +Data Recovery+ via Google, VersionTracker.com, or MacUpdate.com.
I had no idea that external drives should be ejected before updating. Apple really should give a serious warning message if this is a recurring problem.
It's certainly not common, and I've never seen an "official" warning, just a few reports here and there. I still find it hard to believe it can happen, but I figure it's worth ejecting and disconnecting. I just forget to do it most of the time.
Keep us posted.

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