To make that point with an example, my go to for any new disk image or real drive is disktype¹ which produces:
--- cursed.img
Regular file, size 4 MiB (4194304 bytes)
FAT12 file system (hints score 4 of 5)
Volume size 3.916 MiB (4106240 bytes, 2005 clusters of 2 KiB)
Ext2 file system
UUID 2D74B033-E8A6-4738-98B2-02BCC3F0D98E (DCE, v4)
Last mounted at "/home/kuba/cursedfs/mountpoint"
Volume size 64 KiB (65536 bytes, 64 blocks of 1 KiB)