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you can get this working by editing a plist file:

1. open a new Terminal window

2. edit: /Library/Preferences/SystemConfiguration/com.apple.Boot.plist

3. Insert mbasd=1 in the <string></string> value below the <key>Kernel Flags</key>. If the string is not empty to begin with (it normally is) or doesn't exist (sometimes happens), then use a space to separate the mbasd=1 from what’s already there or create the entry.

The original solution was from Lukas Zeller's blog here

A Gist is available on GitHub for this change also.