Types of filesystems handled by VFS

Physical (backed by physical device, like hard disk, flash or CD) – e.g. ext3, reiserfs, jfs, xfs, jffs, iso9660
Network filesystems (including cluster filesystems) – e.g. nfs, coda, smbfs, gfs, ocfs
Pseudofilesystems – provide various information based on some metainfo or allowing some actions – e.g. proc, sysfs, pipefs, futexfs, usbfs
Special-purpose filesystems – tmpfs, ramfs, rootfs

Physical (backed by physical device, like hard disk, flash or CD) – e.g. ext3, reiserfs, jfs, xfs, jffs, iso9660