Ext4

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Filesystems
Virtual Filesystems

VFS

Disk Filesystems
CD/DVD Filesystems
Network Filesystems
Flash Filesystems

While the ext4 filesystem originated a series of patches to the ext3 filesystem, it was later rebranded as a dedicated filesystem design that shares design with ext2 and ext3. Like ext3, it supports journaling. Amongst the upgrades are larger maximums (file size, filesystem size, files per folder, folders per folder etc), and features that were inspired from existing filesystems like XFS.