You will need to edit (as root) the
/Library/Preferences/SystemConfiguration/com.apple.Boot.plist
file (on the 8gb partition), and set a kernel flag to point to this partition... i used gedit, but any text editor will do.
Look for the lines:
<key>Kernel Flags</key>
<string></string>
I changed them to:
<key>Kernel Flags</key>
<string>rdisk0s3</string>
but you will need to change rdisk0s3 to wherever YOUR 8gb partition is located.
rdisk0s3 = First Physical Hard Drive, 3rd partition (so another example would be rdisk1s2 = second HDD, 2nd partition)
Where:- rdisk0 = First HDD, rdisk1 = Second HDD etc.
and s1 = First partition, s2 = Second partition etc.
save the file.
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