I'm using SanDisk Ultra 64GB and i'm using Etcher to flash it and it says that it's successfully finished but it split up into 2 drives, one of them is renamed to boot which i can access but the other one when i click on my PC says that i need to format it if i want to use it, which i don't. I plugged it into my TV with HDMI cable and it pops an error that says
Could not expand filesystem, please try raspi-config or rc_gui. Boot and root partitions are on different devices .
I'm using Raspberry Pi 3 Model B and the manufacturer is Element14