diff --git a/rust/sys/denali/src/ahci/controller.rs b/rust/sys/denali/src/ahci/controller.rs
index 059f3a7..f62645d 100644
--- a/rust/sys/denali/src/ahci/controller.rs
+++ b/rust/sys/denali/src/ahci/controller.rs
@@ -155,8 +155,13 @@ impl AhciController {
                 mammoth::debug!("Sector size: {:#0x}", new_sector_size);
                 mammoth::debug!("LBA Count: {:#0x}", lba_count);
 
-                //self.sector_size = Some(new_sector_size as u64);
-                //self.sector_cnt = Some(lba_count);
+                // We hardcode assumptions about sector size in a few places, better to panic if we
+                // are wrong.
+                assert_eq!(
+                    new_sector_size, 512,
+                    "Sector size {} differs from 512.",
+                    new_sector_size
+                );
             } else {
                 mammoth::debug!("Skipping non-sata sig: {:#0x}", sig);
             }