De man 8 mount
no Linux:
If no
-t
option is given, or if theauto
type is specified, mount will try to guess the desired type. Mount uses theblkid
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 labelednodev
(e.g.devpts
,proc
andnfs
). 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 optionsilent
.
Então, basta criar um arquivo /etc/filesystems
contendo algo assim:
ext4
ext3
ext2
vfat
msdos
ntfs
iso9660
ufs
xfs
Adicione mais tipos de arquivos, se precisar. Então você pode usar o tipo auto
em fstab
.