diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 1b760a0b1109..9faaaae78b0a 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2144,10 +2144,15 @@ static inline u32 transport_get_sectors_6(
 
 	/*
 	 * Everything else assume TYPE_DISK Sector CDB location.
-	 * Use 8-bit sector value.
+	 * Use 8-bit sector value.  SBC-3 says:
+	 *
+	 *   A TRANSFER LENGTH field set to zero specifies that 256
+	 *   logical blocks shall be written.  Any other value
+	 *   specifies the number of logical blocks that shall be
+	 *   written.
 	 */
 type_disk:
-	return (u32)cdb[4];
+	return cdb[4] ? : 256;
 }
 
 static inline u32 transport_get_sectors_10(