Prepare for the coming of MBR version 3.
Ironic. After all that hoo-haw about dynamically-created MBRs in the previous commit, we introduce a new hardcoded static MBR... Goals: * Single OS partition, in the fast area of rotating disks * Proper alignment for 4k sector drives and SSDs (1MB alignment) * Still works on 40GB disk (aka, pc850s) * P1 16 GiB: goldilocks FS: not too small (> 10GB), but not too big (< 30GB) * P2 3 GiB: can hold a co-loaded MBR 1 image (e.g., FBSD410 delay node OS) * P3 3 GiB: at least as much swap at currently (>= 1GB) The partition table: P1: 2048 33554432 FS, 16GiB P2: 33556480 6291456 possible delay-node OS or additional swap, 3GiB P3: 39847936 6291456 swap, 3GiB P4: 46139392 34278848+ extrafs, 16+GB The larger size and partition alignment are why I pushed this through despite my noble intentions.
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