From the output of the commands you can see that a.) a ramdisk is created, b.) no scratch partition (4GB) exists and c.) only ~1GB of the USB stick's capacity is used by ESXi. For details about ESXi partitioning see e.g. http://rickardnobel.se/esxi-5-0-partitions/
Now the interesting part is to find out to which partition the ScratchLocation points to!? Btw. the "Store" partition's UUID (the one you highlighted) does not match the one for the ScratchLocation.
I have to admit I never took a closer look at this default location, but changed it immediately after installation. What do you see running
ls -la /vmfs/volumes/50de22a5-f4afafa0-f7b5-001517197ad8
André