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The Linux kernel configuration item CONFIG_UMSDOS_FS:

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Say Y here if you want to run Linux from within an existing DOS partition of your hard drive. The advantage of this is that you can get away without repartitioning your hard drive (which often implies backing everything up and restoring afterwards) and hence you're able to quickly try out Linux or show it to your friends; the disadvantage is that Linux becomes susceptible to DOS viruses and that UMSDOS is somewhat slower than ext2fs. Another use of UMSDOS is to write files with long unix filenames to MSDOS floppies; it also allows Unix-style soft-links and owner/permissions of files on MSDOS floppies. You will need a program called umssync in order to make use of UMSDOS; read Documentation/filesystems/umsdos.txt.

To get utilities for initializing/checking UMSDOS file system, or latest patches and/or information, visit the UMSDOS home page at

This option enlarges your kernel by about 28 KB and it only works if you said Y to both "DOS FAT fs support" and "MSDOS fs support" above. To compile this as a module, choose M here: the module will be called umsdos. Note that the file system of your root partition (the one containing the directory /) cannot be a module, so saying M could be dangerous. If unsure, say N.



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