I just messed an ext3 partition

[nikko]

Hi,

I had an old ubuntu which I wanted to upgrade by a fresh install while keeping my personnal files (one partition for home, one drive for data).

During installation I choosed custom partitionning to format my / partition and use without formatting my home and data partitions.

While declaring my data partition, I was proposed ext3 as partition type, and I just messed everything by telling me 'why ext3, let's make it ext4'.
Please note that I didn't ask for formatting.

I let installation go on and when booting my fresh install I had a shock : my data partition is empty.

So far I'm trying to recover what I can using foremost, then maybe photorec, etc...

But I'm wondering if did really messed my data, or if I can try to mount my partition forcing ext3 type, or use fdisk to set back ext3 type.

Thanks.

Nikko