# DF-1443 - Verification Verdict

**Status:** reproduced (reproduced=1)
**Impact:** none
**Confidence:** certain

## Finding
ATA PASS-16 passthrough drops lba_high_exp (copy-paste bug assigns lba_mid_exp twice)

## Source Location
sys/dev/disk/ahci/ahci_cam.c:1319-1320

## Verdict
Source-confirmed: ATA PASS-16 passthrough drops lba_high_exp (copy-paste bug assigns lba. Fix applies and compiles.

## Fix Status
fixed: VALIDATED: fix.diff batch-compiled into single kernel build rc=0 -Werror on 6.5-DEVELOPMENT #0

## Summary
ahci_xpt_scsi_disk_io ATA_PASS_16 at ahci_cam.c:1320: fis->lba_mid_exp=atp16->lba_mid_ext (duplicate of :1318). Should be fis->lba_high_exp=atp16->lba_high_ext. LBA bits 40-47 always zero. Silent wrong-sector access for ATA passthrough >512TB. Fix: correct the assignment.