下面是一些串口指令的簡略清單： Level T - Certification Tests. 證明測試 Download code 下載代碼 Start manufacturing test 開始工廠測試 Set drive ‘Age’ 設置硬盤“年齡” Commands to read cert logs, read error logs, write test data to flash, etc. 用來讀取實在日志，讀取錯誤日志，寫入測試數據到FLASH等等的命令。 Level 1 - Memory Control Commands. 內存控制命令。 Commands to display buffer, display memory, set memory, copy buffer to flash, read sysvars from disk, etc. 用來顯示緩存，顯示內存，設置內存，復制緩存到FLASH，從硬盤讀取SYSVARS等等的指令。 Level 2 - Drive Level Commands 硬盤級別指令 A command to configure the cylinders, heads for testing, gives option for random cylinder/head and random data patterns 用來為測試配置柱面，磁頭，給出選項來隨機柱面/磁頭和隨機數據模式的指令。 Commands to set data patterns, perform ECC tests, manipulate the error log, dump the sequencer ram. 用來設置數模式，執行ECC測試，處理錯誤日志， RAM堆棧次序的指令 Commands to do physical to logical conversion, assign skips and alternates, etc. 用來做物理到邏輯轉換，分配跳過和輪流等等的指令 Commands to spinup, spindown, seek, read, write, read long, write long, read compare, sleep, set retries, etc. 用來開啟主軸電機轉動，停轉，尋道，讀，寫，始終讀，始終寫，讀比較，睡眠，設置重試等等的指令 Level 3 - Seeking Commands 尋道指令 Display the zone table 顯示區域表 Motor acceleration test Measure head switch & settling times 調節磁頭轉換和設置時間 Display head offset 顯示磁頭的偏移量 Move actuator open loop 移動激勵器打開回路 Seek, seek physical, varying length seek test 尋道，物理尋道，改變尋道測試的長度 Latch test 關閉測試 Display position of actuator 顯示激勵器的位置 Hysteresis test 磁滯測試 Latch Exerciser test 關閉進行的測試
Level 4 - Servo Tracking Commands 伺服跟蹤指令 Manipulate a skipped cylinder table 使用一個跳過柱面表 Tracking error test 跟蹤錯誤測試 Display position error signal 顯示位置錯誤信號 Zap servo burst 清除伺服脈沖 Set servo offset 設置伺服偏移量 Set/display tracking gain 設置/顯示行進蹤 Send impulse to actuator 發送推動脈沖到激勵器 Level 5. 工廠保留命令 Level 6 -批處理命令 Batch файлы для тестирования запусков-остановок, переключения головок, CSS, тестов 1, 2, 3 коррекции burts, files to test start-stop, head switch, CSS, 1,2,or 3 burst correction test, назначаемые тесты, тесты сравнения данных, возможность вводить различные batch файлы в RAM. Level 7 - Adaptive Control Commands 適應的控制指令 Tune parameter control and display 調整控制參數并顯示 Diagnostic read track 軌道讀取診斷 AGC gain control AGC（增益）增加控制 Perform VCO calibration for all zones 為所有區域執行VCO校準
Level 8 - Special Packwriter Commands 特殊包寫入器指令 - Servo diagnostic sub commands 伺服診斷子指令 - Configuration commands 配置指令 - Lock spin external, spin speed adjust 鎖定外部主軸電機，主軸電機轉速調整 - Set actuator bias current 設置激勵器偏流
