lsblk -f
pi@buster48:~ $ lsblk -f
NAME FSTYPE LABEL UUID FSAVAIL FSUSE% MOUNTPOINT
sda
└─sda1 ext4 usbdisk1 8787d0f4-f4ab-4eb7-bbb1-ea77b5b2ea41 869.2G 0% /media/usb0
mmcblk0
├─mmcblk0p1 vfat boot 1FAF-0B10 207M 19% /boot
└─mmcblk0p2 ext4 retropie a6308ae3-fdfb-4c68-b14f-ba56fb5746f1 25G 10% /
I labeled the disk usbdisk1.
I am using ext4 file system.
Not worth messing with fat32 etc.