Installing Mac OS X on an external hard drive

Due to failure of the internal hard drive, I´m trying to install Mac OS X Tiger on an external hard drive to boot my mini with it. It´s a 40GB USB Lacie. I think it´s been partitioned and formatted correctly (two partitions, one of them with Journaling turned on and 16GB of free space). However, when I get to the Select a Destination step on the installation process, I cannot install Mac OS on the volume.
What am I missing?
Thanks,
Javier

No, both of them do show up. They just cannot be selected as destination for the installation. The screen is split in two: on the upper half I get the icons for both drives with a red alert; on the lower half, the following message:
Installing this software requires 15.5GB of space.
You cannot install Mac OS X on this volume. Mac OS X cannot start up from this volume.
As for 16GB being too small, I´ve done a different partition, this time with 25GB, and the result is the same.

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