user516: I have the Bitcoin client installed on my Windows PC, but I want to set up a savings wallet with better security that I access with an Ubuntu live CD. I don't want to have to download the entire blockchain though - can I use my blockchain from Windows in the Ubuntu OS?
And how can I copy the blockchain from my existing Windows client installation to, say, a USB stick for use by an Ubuntu live CD, then into the Bitcoin client folder? 

user15567: bitcoin data dir link in the wiki:
https://en.bitcoin.it/wiki/Data_directory
... shows where all the data files are located, the "a proper folder" link from ThePiachu 's post seems to have died since.

user323: You can find the blockchain in this directory:
C:\Documents and Settings\YourUserName\Application data\Bitcoin (XP)
or
C:\Users\YourUserName\Appdata\Roaming\Bitcoin (Vista and 7)
As blk0001.dat and blkindex.dat. Copying those files to a proper folder on your Ubundu (~/.bitcoin/) should spare you from redownloading the entire blockchain.

516: <p>I have the Bitcoin client installed on my Windows PC, but I want to set up a savings wallet with better security that I access with an Ubuntu live CD. I don't want to have to download the entire blockchain though - can I use my blockchain from Windows in the Ubuntu OS?</p>

<p>And how can I copy the blockchain from my existing Windows client installation to, say, a USB stick for use by an Ubuntu live CD, then into the Bitcoin client folder? </p>
 15567: <p>bitcoin data dir link in the wiki:
<a href="https://en.bitcoin.it/wiki/Data_directory" rel="nofollow">https://en.bitcoin.it/wiki/Data_directory</a>
... shows where all the data files are located, the "a proper folder" link from ThePiachu 's post seems to have died since.</p>
 323: <p>You can find the blockchain in this directory:</p>

<p>C:\Documents and Settings\YourUserName\Application data\Bitcoin (XP)
or
C:\Users\YourUserName\Appdata\Roaming\Bitcoin (Vista and 7)</p>

<p>As blk0001.dat and blkindex.dat. Copying those files to <a href="https://en.bitcoin.it/wiki/Securing_your_wallet#Locating_Bitcoin.27s_data_directory" rel="nofollow">a proper folder</a> on your Ubundu (~/.bitcoin/) should spare you from redownloading the entire blockchain.</p>
