Ok, Toshiba A135-s4457.

Factory setup.

It has a 1.46GB "Eisa Partition" on the hard drive (no drive letter,
invisible).

What is it?

Google search turns up LOTS of people asking this question, lots of
speculation (most of it I believe wrong). Does anyone know?

It is NOT a "restore partition"; it's too small. The system has a 120GB
drive and with NO additional software installed, it's using 34GB. Ok,
there is a lot of "crapware", but even using compressed files, it takes
about 3GB to 5GB to setup a restore configuration for Vista Home
Premium, this is WAY too small to be a restore partition.

So, to repeat the question: Anyone know what it is? Apparently,
whatever it is, it is quite common (on other Toshiba models as well as
on other brands of laptops).