Samsung M8 manual Disk Drive Operation, Head / Disk Assembly HDA, Base Casting Assembly

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CHAPTER 5 DISK DRIVE OPERATION

This chapter describes the operation of the Spinpoint M8 hard disk drive functional subsystems. It is intended as a guide to the operation of the drive, rather than a detailed theory of operation.

5.1Head / Disk Assembly (HDA)

The Spinpoint M8 hard disk drive consists of a mechanical sub-assembly and a printed circuit board assembly (PCBA), as shown in Figure 5-1. This section describes the mechanism of the drive.

The head / disk assembly (HDA) contains the mechanical sub-assemblies of the drive, which are sealed between the aluminum-alloy base and cover. The HDA consists of the base casting assembly (which includes the DC spindle motor assembly), the disk stack assembly, the head stack assembly, and the rotary voice coil motor assembly (which includes the actuator latch assembly). The HDA is assembled in a clean room. These subassemblies cannot be adjusted or field repaired.

CAUTION: To avoid contamination in the HDA, never remove or adjust its cover and seals. Disassembling the HDA voids your warranty.

The Spinpoint M8 hard disk drive models and capacities are distinguished by the number of heads and disks. The ST250LM004 have one (1) disk and two (2) read/write heads. The ST320LM001 have one (1) disk and two (2) read/write heads. The ST500LM012 has one (1) disk and two (2) heads. The ST640LM001 have two (2) disks and four (4) read/write heads. The ST750LM022 have two (2) disks and four (4) read/write heads. The ST1000LM024 has two (2) disks and four (4) read/write heads.

5.1.1Base Casting Assembly

A one piece, aluminum-alloy base casting provides a mounting surface for the drive mechanism and PCBA. The base casting also serves as the flange for the DC spindle motor assembly. A gasket provides a seal between the base and cover castings that enclose the drive mechanism.

5.1.2DC Spindle Motor Assembly

The DC spindle motor assembly consists of the brush-less three-phase motor, spindle bearing (FDB) assembly, disk mounting hub, and a labyrinth seal. The entire spindle motor assembly is completely enclosed in the HDA and integrated to the base casting. The labyrinth seal prevents bearing lubricant from coming out into the HDA. The motor rotates the spindle shaft at 5400 rpm.

Spinpoint M8 Product Manual REV 2.3

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Contents M8 Product Manual Page Table of Contents Servo System Read and Write Operations Read Fpdma Queued 60h Read Log Extended 2Fh Read Long 22h Table of Tables Manual Organization ScopeUser Definition Reference SataIntroduction DescriptionKey Features Hardware Requirements Standards and RegulationsSpecification Summary SpecificationsSpecifications Spindle speed RPM RPM ClassLogical Configurations Physical SpecificationsPhysical Specifications Physical dimensionsPerformance Specifications Power consumption Power consumptionPower Requirements RatedEnvironmental Specifications Environmental Specifications15.0 Reliability Specifications Space Requirements InstallationMounting Unpacking InstructionsOrientation Mounting DimensionsMounting-Screw Clearance ClearanceSata Connectivity Cable ConnectorsVentilation Serial ATA Management PowerHDD Power, Sata Interface, and Factory Jumper Connector Pin Locations on the Drive Pcba DC Power Connector and SATA-Bus Interface Cable Connections Drive InstallationBase Casting Assembly Head / Disk Assembly HDADC Spindle Motor Assembly Disk Drive OperationCoverAssembly Head Stack Assembly Disk Stack AssemblyVoice Coil Motor and Actuator Latch Assemblies Air Filtration SystemDisk Controller Digital Signal Process and Interface ControllerDrive Electronics DDR Buffer Control Block Host Interface Control BlockFrequency Synthesizer Disk Control BlockDisk Ldpc Control Block Read/Write IC Power ManagementTime Base Generator Automatic Gain ControlAnalog to Digital Converter ADC and FIR Analog Anti-Aliasing Low Pass FilterRead Channel Servo SystemRead and Write Operations Read Caching Firmware FeaturesWrite Channel Write Caching Automatic Defect Allocation Defect ManagementMulti-burst ECC Correction SmartSata Terminology Sata II InterfaceSpinpoint M8 Product Manual REV Signal Descriptions Physical Interface Signal Summary2 I/O Register Address When read When writtenControl Block Register Descriptions RegistersFeatures Register and Feature Extended Register Ex F1h Command Block Register DescriptionsError Register Ex F1h Device Control Register ex F6hDevice Register Ex F6h Command Register Ex F7hStatus Register Ex F7h Device Activity Signal Sata II Feature SETStaggered Spin-up Disable Control Auto-Activate in DMA Setup FISPhy. Event Counters Sata Power Management Software Settings PreservationCommand Code Parameters ATA Command DescriptionsCommand Table Check Power Mode E5h Command DescriptionsDevice Configuration Overlay Feature Register Values Device Configuration Overlay B1hCommand Download Micro Code 92hDevice Configuration Identify data structure Word Content Diagnostic Codes Execute Device Diagnostics 90hFlush Cache E7h, EAh extended Format Track 50hIdentify Device information Content Description=the fields reported in word 88 are valid EXT =Media Card Pass Through command feature set supported WWN Word Content DescriptionIdle Immediate E1h Automatic Standby Timer PeriodsIdle E3h NOP 00h Initialize Device Parameters 91hRead Buffer E4h Read DMA C8h, 25h extendedRead Long 22h Read Multiple Command C4h, 29h extendedRead Log Extended 2Fh Read Verify Sectors 40h, 41h extended Read Native Max Address F8h, 27h extendedRead Sectors 20h, 24h extended Recalibrate 10h Security Disable Password F6hSecurity Erase Prepare F3h Security Erase Unit F4hSecurity Erase Unit Password Word Content Security Set Password F1hSecurity Set Password data content Security Freeze Lock F5hIdentifier Level Command result Set Features EFhSecurity Unlock F2h Seek 7xh12 Transfer Mode Values 11 Set Features Register Definitions13 Set Max Feature Register Values Set Multiple Mode C6hSet Max Address F9h, 37h extended Sleep E6hSmart disable operations D9h 14 Smart Feature Registers ValuesSmart enable/disable attribute auto-save D2h Smart B0hSmart execute off-line immediate D4h Smart enable operations D8h15 Device Smart Data Structure Smart read data D0hData Structure Revision Number 16 Smart Attribute Status Flags Bit Name Description18 Off-line Data Collection Status Values 17 Smart Attribute Data List19 Self-test Execution Status Values Self-test execution status byteSmart write log sector D6h Smart read log sector D5hSmart return status DAh Write Buffer E8h Standby Immediate E0hWrite DMA CAh, 35h extended Write Fpdma Queued 61hWrite Sectors 30h, 34h extended Write Multiple Command C5h, 39h extendedWrite Long 32h Spinpoint M8 Product Manual REV General Information MaintenanceMaintenance Precautions HDD handling guide -Please handle HDD by side surfaces HDD handling guide Prevent Shocks Service and Repair