USB booting :: What Am I missing?

So, i've burned a live cd, booted, installed in a pendisk, everything ok. I used a 256 1.1 pendisk, and the whole system took roughtly half the avaiable space.
My question now is the following, i'm using Qemu tu run dsl in a window inside linux, but if i copy a file into the pendrive in windows, i can't seem to find inside de dsl system. I've tryed to mount nigh all the sda* and sdb* to no avail.
I would welcome some help, even if it's probably something really stupid that i'm missing

Regrats!