I have no clue what the cluster size is, I do have a windows pc on me that isnt mine but that I can use though, so how would I check it w/ that? I have a sd>usb and all that ready to see
sorry for the late reply, I had school, cluster size is... well... I don't know the definition of it, but on windows in the format drive menu, there's a dropdown menu for cluster size, just like @fmkid said, use 64kb for your 128 gig sd card