Default [Q] Deleting storage via Fastboot

Hi all, i firstly hope that i'm writing in the right section, and sorry for my english; i'll be very happy if u can help me with this problem:
I have to deleting storage in the internal memory of my sony xperia sola via fastboot, i found a complete list of fastboot's command, but i need to know what's the parameter associated with the partition of the internal memory. i really hope that someone of you can help me, thanks for the (i guess) answers