After upgrade to 10.9 my external hard drive is locked

Hi All,
I am using a 1T Buffola External HD (connect by Thunderbolt) onto my MacBook Pro as a Backup Device by Time Machine.
I haven't disconnect my external HD before I do the upgrade, once the upgarde is done and restrat, a message pop-up for me to type a Password for my external HD, I type my usual PW whcih I always use, it's also doesn't work.
I have try different kind of method by putting the External HD to a older system 10.8, to another 10.9 computer, restart with the external partition OS....
Still pop up the same message, type your PW, just can see the contents insdie.
Please HELP>>>>I have more than 400G of data inside.....HELP>>>>>
yipch

You need to look at this long thread in the Mavericks forum: https://discussions.apple.com/thread/5475611?tstart=0
First, disconnect your external drives and don't touch them again until you've researched this.

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Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
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After upgrade to 10.9 my external hard drive is locked

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