Key Findings from T017-T018

T017 Key Discoveries

1. D2 Shock is a demo disc - 450 track-1 frames vs 600 for retail discs, 29.2% compression ratio
2. DCHQ splits are consistent - Discs 2A/2B/4 all share head_md5 898c40013... suggesting identical track 1 content (bootloader/DSI layer identical across pressings)
3. JP VSN set is complete - 4 retail discs + 1 demo disc, all CHD v5 with identical 3-track layout
4. SFV checksums are authoritative - Primary integrity token for CDI files; SHA-256 not practical for 764M+ raw images at 120s timeout