for those with the stuck problem (ext3 or something):

Hehe, I had just that problem and did not figure out how that code
for manual formatting were surposed to write, but after a lot of
writing, I figured that this were the way to go;
You need to write this first to ensure that the phone does not use
the memorycard;

umount /dev/mmcblk1p1

This means with all the spaces, exact that code and press enter.
Then write;

sfdisk -uM /dev/mmcblk1 << EOF
,<YOUR NUMBER IN MB>,C
,,L
,,
,,
EOF

Allso with all the spaces, and new line means pressing enter.
like this:

sfdisk -uM /dev/mmcblk1 << EOF (enter)
,6100,C (enter)
,,L (enter)
,, (enter)
,, (enter)
EOF (enter)

keep in mind that the number 6100 might not be the number
required for your memory card, since I have a 8 GB.
the numbers you can use is:
1, 100, 2100(4GB) , 6100 (8GB), 14100, 30100

and then it should run! It might take about 8-10 min to install
(I only figured out how to write the code allready provided
propperly, I do not take credit for anything)
hope that helps, and have a nice day!