The following are some of the media-based filesystems supported by Android devices.

The Extended File System (EXT), which was introduced in 1992 specifically for the Linux kernel, was one of the first filesystems, and it used a virtual filesystem. EXT2, EXT3, and EXT4 are the subsequent versions. Journaling is the main advantage of EXT3 over EXT2. With EXT3, if there is an unexpected shutdown, there is no need to verify the filesystem. The EXT4 filesystem has gained significance with mobile devices implementing dual-core processors. The YAFFS2 filesystem is known to have a bottleneck on dual-core systems. With the Gingerbread version of Android, the YAFFS filesystem was swapped for EXT4.

The following are the mount points that use EXT4 on the Samsung Galaxy mobile:

/dev/block/mmcblk0p9 /system ext4 ro,noatime,barrier=1,data=ordered 0    0
/dev/block/mmcblk0p3 /efs ext4 rw,nosuid,nodev,noatime,barrier=1,journal_async_commit,data=ordered 0 0
/dev/block/mmcblk0p8 /cache ext4 rw,nosuid,nodev,noatime,barrier=1,journal_async_commit,data=ordered 0 0
/dev/block/mmcblk0p12 /data ext4 rw,nosuid,nodev,noatime,barrier=1,journal_async_commit,data=ordered,n oauto_da_alloc,discard 0 0  

Virtual File Allocation Table (VFAT) is an extension to the FAT16 and FAT32 filesystems. Microsoft's FAT32 filesystem is supported by most Android devices. It is supported by almost all the major operating systems, including Windows, Linux, and macOS. This enables these systems to easily read, modify, and delete the files present on the FAT32 portion of the Android device. Most of the external SD cards are formatted using the FAT32 filesystem.

Observe the following output, which shows that the /sdcard and /secure/asec mount points use the VFAT filesystem:

The final category is pseudo filesystems.