I found that sh*t… Also was looking for this allocation info - two days 
Program you need to check it is: ChipEasy_EN_V1.5.6.6
can be downloaded for ex. here: https://www.usbdev.ru/files/chipeasy/
It shows allocation. In my case, fancy sandisk pro 256 gb read: 420 write 380 mb has 32mb allocation size! That’s why is so fast…I feel kind of f*ck… anyway, I hope this program will help you guys and girls 
