[ILUG] Doh - Partition Types

[Breathnach, Proinnsias (Dublin)]

Anyone know how to reset the partition types from within Linux when the type
was set to 0

<Scenario mode=Dumb_Thing_To_Do>
Decided I had to reinstall NT (dualboot) for various reasons:
Booted Linux (SuSE 6.4), set all linux partitions to type 0 (so as to avoid
a problem with NT's loader/installer)
Ran NT setup, all went well, 
Booted from a rescue CD ... Mounted all original partitions ok (inc the
reiserFS one)
opened fdisk .... couldn't see the partitions ...
</Scenario>
The kernel and filesystems see all the partitions, and can mount them, fdisk
(and friends) don't, so I can't retype them. 
gpart sees the first few (smaller ext2 partitions) but doesn't recognise the
reiserFS one, and overspecs the swap partition at the end of the disk

Anyone out there ... Something like this *always* happens just as I get the
system into a usable state ...

P