> fdisk sd1
>    NetBSD geometry cyl 7637 head 8 sect/track 274 (2192 s/tr)
> partiton table
>    0 sysid 15 (Ext. partition LBA)
>       start 16065 size 16755795 (8181MB) flag 0x0
>    1 sysid 169 (NetBSD)
>       start 14991088 size 1749216 (854MB) flag 0x0
>    2<UNUSED>
>    3<UNUSED>
> 

Oops..... problem here.
You want to mount the extended partitions on your second drive (sd1).
You want to do this in netbsd. In this case where netbsd is on the same
drive as your logical partitions i must tell you it wont work.
You need mbrlabel to make the logical partitions seem. It replaces the
partition table with a virtual and overwrites the kernel at that moment.
The problem is, when you use mbrlabel on your second harddisk, you have
mounted partitions when you do that. DONT USE mbrlabel on sd1 when you are
in netbsd, cause netbsd is also on sd1.
Personally, i dont know anymore how to mount your extended partitions in
your case. Cause mbrlabel cannot be used now and you really need that.
Perhaps Wolfgang knows a way around this?
Bye,

Reinoud.