OS 10.5 - Leopard 2 partitions & TM Difficulties

Have a look at the 2 pictures:

I have installed Leopard on System.

I have made the backup of Time Machine from Leopard of my old internal HD before it crashed on Macintosh HD.

The problem: by the looks of it, Leopard is on Macintosh HD and the 13 Go on System from the "installation of Leopard" are actually not useful.

I just need to confirm that I can erase and format this partition so that I save 13 Go.... what does someone think and how can he/she helps?

Thanks a lot

Otipep

Attached Images

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