multiple extended partitions

[Aaron Hanson]

Hello All-

        What is the proper grub syntax for identifying a logical
partition in a --2nd-- extended partition? In my particular situation,
the linux kernel maps them like this:

hda1 hda2 hda3 <hda5 hda6 hda7> hda4 <hda8 hda9 hda10>

        (logical partitions in angle-brackets)

        I have kernels to boot in hda5 and hda8. Grub is happy loading
the first kernel; 'root=(hd0,4)' but says 'root=(hd0,7)' is not valid.

        I'm familiar with 'hide' and 'unhide', but would rather not use
them since I want to make use of the kernel's ability to access two sets
of logical partitions...

        Thanks.

-Aaron Hanson