Installable File System
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The Installable File System (IFS) is a driver in the OS/2 operating system, is a method of using certain drivers that recognize different file systems on a computer. For example, for OS/2 to recognize a CD-ROM file system, the CD-ROM IFS has to be loaded.
The standard installation provides IFSs for HPFS, JFS, CD-ROM and RAM disk. FAT support though is integrated in the kernel. Other IFS provided by IBM or third-parties include NTFS, FTP, ext2, Andrew file system, Toronto Virtual File System, NFS.