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BITLOCKER SECURITY.

I now am using bitlocker. I want to know an expert's opinion of how secure it is. I am NOT worried about a "professional" hacker, only people that have some knowledge of computers. Am I safe from a knowledgable computer person that wants to get into my drive or would that take a high level hacker?
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EXPERTS, thanks so much for your valuable advice!
McKnife, your comment was exactly what I was hoping to hear. The key I am using is over 25 characters using letters and numbers.
One thing: this is a password that you use for preboot authentication? Or do you mount a data volume while windows is already running? Preboot authentication is recommended.
I only know how to do it one way. I am NOT well versed in Bitlocker. When windows is running I hook up the external drive that I need protection on. As soon as windows recognizes that the drive has been added it tells me that it needs the bitlocker p/w. I enter the p/w and I am into the external drive.
It should be noted that while windows is booted, keyloggers could record the password.
However, possible attackers would need to install that keylogger, first.