after updating to nougat space dissapeer

hello
i update to nougat by using these commands

fastboot flash bootloader bootloader.img
fastboot reboot-bootloader
fastboot flash radio radio.img
fastboot reboot-bootloader
fastboot flash system system.img
Fastboot flash vendor vendor.img
fastboot flash userdata userdata.img
fastboot flash boot boot.img
fastboot flash recovery recovery.img
fastboot erase cache
fastboot flash cache cache.img

and now instead of 64GB i see only 24..where is the rest?
i have root and twrp
thanks

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