I believe the default filesystem for 11.1 is Ext3. You can check by opening up Yast Partitioner (MAKE SURE NOT TO CHANGE ANYTHING).
Go to Yast then Partitioner.
The first thing that comes up is an overview of your hard disk(s) with the partitions on them and various information, including what filesystems they're using.
Click abort when you're done.
Take Care,
Ian