diff --git a/src/scsi/mod.rs b/src/scsi/mod.rs
index 56c8c1a..6bcf5ab 100644
--- a/src/scsi/mod.rs
+++ b/src/scsi/mod.rs
@@ -268,8 +268,8 @@ impl<'d, D: Driver<'d>> MassStorageClass<'d, D> {
                     .map_err(|_| ())
             }
             ScsiCommand::PreventAllowMediumRemoval { prevent: _prevent } => Ok(()),
-            ScsiCommand::StartStopUnit { stop, load_eject } => {
-                if stop && load_eject {
+            ScsiCommand::StartStopUnit { start, load_eject } => {
+                if !start && load_eject {
                     self.state = State::Ejected;
                     self.last_sense = Some(ScsiError::NotReady);
                 }
diff --git a/src/scsi/scsi_types.rs b/src/scsi/scsi_types.rs
index a9fcfc3..dbd27dd 100644
--- a/src/scsi/scsi_types.rs
+++ b/src/scsi/scsi_types.rs
@@ -91,7 +91,7 @@ pub enum ScsiCommand {
     },
 
     StartStopUnit {
-        stop: bool,
+        start: bool,
         load_eject: bool,
     },
 }
@@ -156,8 +156,8 @@ pub fn parse_cb(cb: &[u8]) -> ScsiCommand {
             prevent: (cb[1] & 0b00000001) != 0,
         },
         START_STOP_UNIT => ScsiCommand::StartStopUnit {
-            stop: (cb[1] & 0b00000001) != 0,
-            load_eject: (cb[1] & 0b00000010) == 0,
+            start: (cb[4] & 0b00000001) != 0,
+            load_eject: (cb[4] & 0b00000010) != 0,
         },
         _ => ScsiCommand::Unknown,
     }