etch; possibly just mkfs problem

Hope this is the right group...

I have problems using the mkfs command i a newly updated debian etch distribution.

I have followed the description on this page:
http://aragorn.kortex.jyu.fi:8080/h6300/

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in section 3.1

The memory card Transcend SD 512MB 80x lists ( ls -la /dev/sd* ) up as /dev/sdc1.

I have root access. Used application "X-terminal as root (GKsu)". (What does GKsu mean?)

In ( fdisk /dev/sdc1 ) it prints ( p ):
Was danish - but used the english desciptions:
Device Boot      Start        End      Blocks   Id System
/dev/sdc1p1          1         99      49873     b W95 FAT32
/dev/sdc1p2        100       1010     451856    83 Linux

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in section 3.2

But I can not figure out how to format the two partitions - tried:

pc:/dev#umount sdc1
(comment: The icon disappear from the desktop)
pc:/dev#mkfs -t vfat /dev/sdc1p1
mkfs.vfat: (was danish; translated to) "No such file or catalog/directory"
pc:/dev#mkfs -t vfat /dev/sdc1
mkfs.vfat: (was danish; translated to) "No such file or catalog/directory"
pc:/dev#mkfs.vfat /dev/sdc1
bash: mkfs.vfat: command not found
pc:/dev#mkfs.vfat /dev/sdc1p1
bash: mkfs.vfat: command not found
pc:/dev#

/Glenn