How to create MD5 and SHA1 hashes of the USB flash?

So square red box that I marked is my path of my usb drive.

I tried md5sum /dev/sdb1, but it denied

so, I tried sudo md5sum dev/sdb1, but it doesn't give me any output just cursor is blinking.

I even tried sudo chmod 666 /dev/sdb1 to allow write and read, and do the same step above

it still not showing me a hash of my usb drive.

Is there a way I can find hash of my usb drive?

udev -VirtualBox:~$ df -h Filesystem Size Used Avail Use% Mounted on 5. 3 0 5.36 0% dev tmpfs 1.16 1.6M 1.16 1% run /dev/sda1 9.8G 6.0G 3.3G 65% | tmpfs 5.36 0 5.36 0% /dev/shm tmpfs 5.OM 4.OK 5.OM 1% /run/lock, tmpfs 5.36 0 5.36 0% /sys/fs/cgroup /dev/loop2 43M 43M O 100% /snap/gtk-common-themes/1313 /dev/loop3 4.2M 4.2M 100% /snap gnome-calculator/406 /dev/loop1 55M 55M 'O 100% /snap/core18/1066 /dev/loopo 150M 150M 100% /snap/gnome-3-28-1804/67 /dev/loop4 3.8M 3.8M 100% /snap/gnome-system-monitor/100 /dev/loop5 89M 89M 100% snap/core/7270 /dev/loop 15M 15M O 100% /snap/gnome-characters/296, /dev/loop7 1.OM 1.0M 100% /snap gnome-logs/61 tmpfs 1.16 16K 1.16 1% /run/user/121 tmpfs 1.16 28K 1.16 1% /run/user/1000 dev/sdb1 15G 19M15G 1% /media/ USB -VirtualBox:~$ md5sum /dev/sdb1 md5sum: /dev/sdb1: Permission denied - VirtualBox:~$ sudo md5sum /dev/sdb1 -VirtualBox:~$ sudo chmod 666 /dev/sdb1