Momentus Series Product Manual 2.5” Hard Disk Drive April 3, 2012 Rev2.1 TABLE OF CONTENTS CHAPTER 1 SCOPE ............................................................................................................................. 1 1.1 USER DEFINITION .............................................................................................................................. 1 1.2 MANUAL ORGANIZATION .................................................................................................................. 1 1.3 SATA ................................................................................................................................................. 2 1.4 REFERENCE ........................................................................................................................................ 2 CHAPTER 2 DESCRIPTION .............................................................................................................. 3 2.1 INTRODUCTION .................................................................................................................................. 3 2.2 KEY FEATURES .................................................................................................................................. 4 2.3 STANDARDS AND REGULATIONS ........................................................................................................ 5 2.4 HARDWARE REQUIREMENTS ............................................................................................................. 5 CHAPTER 3 SPECIFICATIONS ........................................................................................................ 6 3.1 SPECIFICATION SUMMARY ................................................................................................................ 6 3.2 PHYSICAL SPECIFICATIONS ............................................................................................................... 7 3.3 LOGICAL CONFIGURATIONS .............................................................................................................. 7 3.4 PERFORMANCE SPECIFICATIONS ...................................................................................................... 8 3.5 POWER CONSUMPTION ...................................................................................................................... 9 3.6 ENVIRONMENTAL SPECIFICATIONS ................................................................................................ 10 3.7 RELIABILITY SPECIFICATIONS ........................................................................................................ 12 CHAPTER 4 INSTALLATION .......................................................................................................... 13 4.1 SPACE REQUIREMENTS .................................................................................................................... 13 4.2 UNPACKING INSTRUCTIONS............................................................................................................. 14 4.3 MOUNTING ....................................................................................................................................... 14 4.3.1 Orientation ...................................................................................................................... 15 4.3.2 Clearance ........................................................................................................................ 16 4.3.3 Ventilation ...................................................................................................................... 17 4.4 CABLE CONNECTORS ....................................................................................................................... 17 4.4.1 SATA Connectivity .......................................................................................................... 17 4.5 DRIVE INSTALLATION ...................................................................................................................... 22 CHAPTER 5 DISK DRIVE OPERATION ........................................................................................ 23 5.1 HEAD / DISK ASSEMBLY (HDA) ...................................................................................................... 23 5.1.1 Base Casting Assembly ................................................................................................... 23 5.1.2 DC Spindle Motor Assembly ........................................................................................... 23 5.1.3 Disk Stack Assembly ....................................................................................................... 25 5.1.4 Head Stack Assembly ...................................................................................................... 25 5.1.5 Voice Coil Motor and Actuator Latch Assemblies .......................................................... 25 5.1.6 Air Filtration System ....................................................................................................... 25 5.1.7 Load/Unload Mechanism ................................................................................................ 25 5.2 DRIVE ELECTRONICS ....................................................................................................................... 26 5.2.1 Digital Signal Process and Interface Controller ............................................................ 26 5.2.2 Disk Controller ............................................................................................................... 26 5.2.2.1 The Host Interface Control Block ................................................................................................. 28 5.2.2.2 The Buffer Control Block ............................................................................................................. 28 5.2.2.3 The Disk Control Block ................................................................................................................ 29 5.2.2.4 The Disk LDPC Control Block ..................................................................................................... 29 5.2.2.5 Frequency Synthesizer .................................................................................................................. 29 5.2.2.6 Power Management ....................................................................................................................... 30 5.2.3 Read/Write IC ................................................................................................................. 30 5.2.3.1 Time Base Generator ..................................................................................................................... 30 5.2.3.2 Automatic Gain Control ................................................................................................................ 30 5.2.3.3 Asymmetry Correction Circuitry (ASC) ....................................................................................... 30 5.2.3.4 Analog Anti-Aliasing Low Pass Filter .......................................................................................... 31 Momentus Product Manual REV2.1 ii 5.2.3.5 Analog to Digital Converter (ADC) and FIR ................................................................................ 31 5.3 SERVO SYSTEM ................................................................................................................................ 32 5.4 READ AND WRITE OPERATIONS ...................................................................................................... 32 5.4.1 The Read Channel........................................................................................................... 32 5.4.2 The Write Channel .......................................................................................................... 33 5.5 FIRMWARE FEATURES ..................................................................................................................... 33 5.5.1 Read Caching ................................................................................................................. 33 5.5.2 Write Caching ................................................................................................................. 34 5.5.3 Defect Management ........................................................................................................ 35 5.5.4 Automatic Defect Allocation ........................................................................................... 35 5.5.5 Multi-burst ECC Correction ........................................................................................... 35 5.5.6 SMART ............................................................................................................................ 35 CHAPTER 6 SATA II INTERFACE ................................................................................................. 37 6.1 INTRODUCTION ................................................................................................................................ 37 SATA Terminology .................................................................................................................................... 37 6.2 PHYSICAL INTERFACE ..................................................................................................................... 39 6.3 SIGNAL SUMMARY ........................................................................................................................... 39 6.3.1 Signal