Well, I did tried to re-format /hda5 as /ext3 but system reminded me that it is mounted and YAST can unmount and format. When I chose yes, system again reminded me saying I may loose data. So I backed of
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Regarding the output : /sbin/fdisk -l
This is the output:
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Device Boot Start End Blocks Id System
/dev/hda1 1 62 497983+ 82 Linux swap / Solaris
/dev/hda2 4867 9733 39094177+ 5 Extended
/dev/hda3 * 63 1989 15478627+ 83 Linux
/dev/hda4 1990 4866 23109502+ 83 Linux
/dev/hda5 4867 5259 3156741 82 Linux swap / Solaris
/dev/hda6 5260 9733 35937373+ 83 Linux
Partition table entries are not in disk order
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It seems that this is risky business to do in that case I have to consider using the space for storage as suggested by Stan and Syg00.
Thanks everyone for helping me.