Secret to Building on Removable Media - FireWire Disk?

I'm Unable to build successfully in "/rmdisk/unnamed_rmdisk/export/testws" 
workspace.  The intent was to off-load the build to an external disk due to 
limited disk space on laptop.
After a couple of days with Developer's Reference, man pages and wading through 
build scripts I gave up and started the build on laptop disk....

My problems on FireWire disk were lock-file related...unable to lock for 
read..and symlink between .make.state and .make.state.lock.
 
 
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