merdzd My cyrillic is not the strongest but I’m pretty sure thats not correct. The batocera is 3GB as you would expect, but the SHARE is not labelled anything and is only 256 MB big? The user data requires more space than that to work. I would delete the 256 MB partition, make a new partition using the whole 300 GB that is left and make it EXT4 if possible. NTFS works for external drives so if you are editing partitions in windows use that.
To format it EXT4 I would use a live usb linux and do it with the GParted program. It also allows you to resize and clone partitions between harddrives.