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I'm trying to create an fstab entry for /dev/fd0 so that user can mount a floppy formatted either with VFAT or ext32. The simple fstab entry

/dev/fd0 /mnt/floppy auto noauto,user,sync,gid=users,umask=000 0 2

can only mount DOS floppies. If I change the entry to

/dev/fd0 /mnt/floppy ext2 noauto,user,sync 0 2

then I can only mount a floppy with ext2 filesystem. Obviously, I can issue a root mount command with appropriate -t option and mount either floppies. Is there a way to mount floppy as user with the simple command

mount /mnt/floppy

for floppies with either VFAT or ext2 filesystem?

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From man 8 mount on Linux:

If no -t option is given, or if the auto type is specified, mount will try to guess the desired type. Mount uses the blkid library for guessing the filesystem type; if that does not turn up anything that looks familiar, mount will try to read the file /etc/filesystems, or, if that does not exist, /proc/filesystems. All of the filesystem types listed there will be tried, except for those that are labeled nodev (e.g. devpts, proc and nfs). If /etc/filesystems ends in a line with a single *, mount will read /proc/filesystems afterwards. While trying, all filesystem types will be mounted with the mount option silent.

So just create a file /etc/filesystems containing something like this:

ext4 ext3 ext2 vfat msdos ntfs iso9660 ufs xfs

Add more filetypes if you need. Then you can use type auto in fstab.

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  • @Sato Katsura - thanks for your interest in responding to my question. I do have the /etc/filesystems file that contains ext2 and vfat entries, yet fstab with auto entry gives error suach as "bad superblock..." if using mount command without -t option. The cat /proc/filesystem shows only filesystems currently used by mounted devices. This problem happens only with /dev/fd0; I can mount auto sda devices (usb sticks formatted either vfat or ext2). Strange behavior for fd0? Commented Oct 18, 2017 at 15:19
  • @Janos The order is important, the entries are tried in order. If msdos comes before vfat and you try to mount a vfat filesystem you'll get an error, because the filesystems are similar enough for msdos to match. Commented Oct 18, 2017 at 15:31
  • @sato Katsura - it works now! Thanks again, Janos Commented Oct 20, 2017 at 2:14

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