Big disks (more than 120GB or so) work *only* with Hijack kernels.

The bigdisk builder images have built-in Hijack kernels.

Disks built with bigdisk that are smaller than 128GB will work with "regular" kernels as well as with Hijack kernels.

EDIT: there also now exist *experimental* bigdisk builders, which are labelled as such. Those ones lay out the drive in a form which requires a Hijack kernel from that point onward. Don't use those unless you have a big drive.

-ml