Fujitsu MHD2021AT, MHC2032AT, MHC2040AT, MHD2032AT manual Spindle motor control

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Theory of Device Operation

d)If the head is stopped at the reference cylinder from there. Track following control starts.

(2)Seek operation

Upon a data read/write request from the host, the MPU confirms the necessity of access to the disk. If a read/write instruction is issued, the MPU seeks the desired track.

The MPU feeds the VCM current via the D/A converter and power amplifier to move the head. The MPU calculates the difference (speed error) between the specified target position and the current position for each sampling timing during head moving. The MPU then feeds the VCM drive current by setting the calculated result into the D/A converter. The calculation is digitally executed by the firmware. When the head arrives at the target cylinder, the track is followed.

(3) Track following operation

Except during head movement to the reference cylinder and seek operation under the spindle rotates in steady speed, the MPU does track following control. To position the head at the center of a track, the DSP drives the VCM by feeding micro current. For each sampling time, the VCM drive current is determined by filtering the position difference between the target position and the position clarified by the detected position sense data. The filtering includes servo compensation. These are digitally controlled by the firmware.

4.7.5 Spindle motor control

Hall-less three-phase twelve-pole motor is used for the spindle motor, and the 3- phase full/half-wave analog current control circuit is used as the spindle motor driver (called SVC hereafter). The firmware operates on the MPU manufactured by Fujitsu. The spindle motor is controlled by sending several signals from the MPU to the SVC. There are three modes for the spindle control; start mode, acceleration mode, and stable rotation mode.

(1) Start mode

When power is supplied, the spindle motor is started in the following sequence:

a)After the power is turned on, the MPU sends a signal to the SVC to charge the charge pump capacitor of the SVC. The charged amount defines the current that flows in the spindle motor.

b)When the charge pump capacitor is charged enough, the MPU sets the SVC to the motor start mode. Then, a current (approx. 0.7 A) flows into the spindle motor.

c)The SVC generates a phase switching signal by itself, and changes the phase of the current flowed in the motor in the order of (V-phase to U-phase), (W- phase to U-phase), (W-phase to V-phase), (U-phase to V-phase), (U-phase to W-phase), and (V-phase to W-phase) (after that, repeating this order).

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Contents Disk Drives Product Manual MHC2032AT, MHC2040AT MHD2032AT, MHD2021ATHandling of This Manual For Safe OperationPage Revision History Page Overview of Manual PrefaceOperating Environment Conventions for Alert MessagesLiability Exception Page Important Alert Messages Important Alert ItemsPage Contents Contents Interface Contents GL-1 Figures IllustrationsTables Surface temperature measurement points and standard values Device Overview Features Functions and performanceAdaptability Features Specifications summary Device SpecificationsSpecifications MHC2032AT/MHC2040AT MHC2032AT MHC2040ATMHD2021AT MHD2032AT Specifications MHD2021AT/MHD2032ATModel and product number Power RequirementsMHC2032AT MHD2021ATCurrent fluctuation Typ. at +5V when power is turned on Current and power dissipationEnvironmental specifications Environmental SpecificationsAcoustic noise specification Acoustic NoiseShock and Vibration Media Defects Error RateDevice Configuration Disk drive outerview the MHC Series and MHD Series Device ConfigurationConfiguration of disk media heads System Configuration ATA interface2 1 drive connection 3 2 drives connection 2 drives configurationPage Installation Conditions Dimensions MHC series 1/2 DimensionsDimensions MHD series 2/2 Orientation Sample MHC2040AT MountingMounting frame structure PCAMeasurement point Temperature Service area Sample MHC2040AT Cable Connections Device connectorCable connector specifications Cable connector specificationsDevice connection BergJumper Settings Power supply connector CN1Location of setting jumpers Master drive-slave drive setting Factory default setting13 Example 1 of Cable Select 12 Csel setting14 Example 2 of Cable Select Page Theory of Device Operation Subassemblies OutlineDisk HeadSpindle ActuatorAir filter Circuit Configuration Circuit Configuration Power-on Sequence Self-calibration Self-calibration contentsExecution timing of self-calibration Self-calibration execution timechart Command processing during self-calibrationRead/write Circuit Read/write preamplifier PreAMPWrite precompensation algorithm Write circuitRead/write circuit block diagram Read circuit Frequency characteristic of programmable filterDigital PLL circuit Servo control circuit Servo ControlServo Control Physical sector servo configuration on disk surface Servo Control Servo frame format Data-surface servo formatActuator motor control Spindle motor control Servo Control Page Interface Physical Interface Interface signalsSignal assignment on the connector Signal assignment on the interface connectorDasp GND Diow EncselStop DiorDasp IordyDdmardy Logical Interface 1 I/O registers I/O registersDA2 DA1 DA0 UNC Idnf Abrt Command block registersLogical Interface DEV HS3 HS2 HS1 HS0 DSC DRQ ERR BSYInterface Host Commands Control block registersSrst Command code and parameters 1 Command code and parametersCommand code and parameters 2 Command descriptions Host Commands Read Multiple X’C4’ Host Commands Execution example of Read Multiple command Host Commands Interface End head No. /LBA MSB 1F7 HCM 1F6 HDH Write Multiple X’C5’ Interface Write Verify X’3C’ Interface Host Commands Initialize Device Parameters X’91’ Identify Device X’EC’ Information to be read by Identify Device command 1 Number of current Cylinders Information to be read by Identify Device command 2 Command Bit Reserved Multiple sector transfer =Enable Information to be read by Identify Device command 3 Identify Device DMA X’EE’ Features register values and settable modes SET Features X’EF’’AA’ ’BB’Host Commands SET Multiple Mode X’C6’ Host Commands Execute Device Diagnostic X’90’ Diagnostic code Interface Host Commands Write Buffer X’E8’ Host Commands Interface Host Commands Interface Host Commands ’FF’ Host Commands Features Register values subcommands and functions Features Resister Function 1FF Format of device attribute value dataFormat of insurance failure threshold value data Interface Host Commands Interface 10 Contents of security password At command issuance I-O register contents 1F7 hCM Host Commands Read DMA Write DMA 11 Contents of Security SET Password data Locked Mode Flush Cache E7 13 Command code and parameters 1 Error posting13 Command code and parameters 2 Command Protocol Data transferring commands from device to hostExecute Device Diagnostic Initialize Device Parameters Read Sectors command protocol Protocol for command abort Data transferring commands from host to deviceWrite Sectors command protocol Commands without data transfer Other commands DMA data transfer commandsRead Multiple Sleep Write Multiple Normal DMA data transfer Overview Ultra DMA Feature SetUltra DMA burst initiation phase Phases of operationUltra DMA burst termination phase Data transfer phaseInitiating an Ultra DMA data in burst Ultra DMA data in commandsData in transfer Pausing an Ultra DMA data in burstTerminating an Ultra DMA data in burst Ultra DMA Feature Set Interface Ultra DMA data out commands Initiating an Ultra DMA data out burstData out transfer Pausing an Ultra DMA data out burst Terminating an Ultra DMA data out burst Interface Ultra DMA CRC rules XOR f11 15 Recommended series termination for Ultra DMA Series termination required for Ultra DMAPIO data transfer Timing10 Data transfer timing Single word DMA data transfer 11 Single word DMA data transfer timing modeMultiword DMA data transfer 12 Multiword DMA data transfer timing modeStarting of Ultra DMA data In Burst Transfer of Ultra DMA dataName Mode Comment MIN MAX Dmardy 16 Ultra DMA data burst timing requirements 214 Sustained Ultra DMA data in burst Sustained Ultra DMA data in burst15 Host pausing an Ultra DMA data in burst Host pausing an Ultra DMA data in burst16 Device terminating an Ultra DMA data in burst Device terminating an Ultra DMA data in burst17 Host terminating an Ultra DMA data in burst Host terminating an Ultra DMA data in burst18 Initiating an Ultra DMA data out burst 19 Sustained Ultra DMA data out burst Sustained Ultra DMA data out burst20 Device pausing an Ultra DMA data out burst Device pausing an Ultra DMA data out burst21 Host terminating an Ultra DMA data out burst Host terminating an Ultra DMA data out burst22 Device terminating an Ultra DMA data out burst 23 Power on Reset Timing Power-on and resetOperations Response to power-on Device Response to the ResetResponse to power-on Response to hardware reset Response to hardware resetResponse to software reset Response to software resetResponse to diagnostic command Response to diagnostic commandDefault parameters Default parametersAddress Translation Logical address Address translation example in CHS modePower save mode Power SaveOperations Defect Management Power commandsAlternating defective sectors Spare areaAlternate cylinder assignment Data buffer configuration Read-Ahead CacheCaching operation Read Sector S Read Multiple Read DMA − Write Sectors − Write DMA − Write Multiple− Read Sector S − Read DMA Mis-hit no hit Usage of read segmentSequential read DAP HAPRead-ahead data New read-ahead data Hit data Full hit hit all Partially hit Write Cache Write Sectors Write Multiple Page Glossary Rotational delay Power save modePIO Programmed input-output PositioningVCM StatusPage Acronyms and Abbreviations Page Index DAC IndexInitialize Device Parameters Read DMA Read Long 5-43 Read Multiple 5-18 Read Sectors MPU Mtbf MttrSET Features IN-6 C141-E050-02EN Page MHC2032AT, MHC2040AT, MHD2032AT, MHD2021AT Disk Comment FormDrives Product Manual Japan

MHC2040AT, MHC2032AT, MHD2032AT, MHD2021AT specifications

Fujitsu offers a range of advanced hard disk drives (HDD) designed for various computing needs, including the MHD2021AT, MHD2032AT, MHC2032AT, and MHC2040AT models. These drives combine reliable performance, capacity options, and technological features aimed at enhancing data storage efficiency.

The Fujitsu MHD2021AT is known for its capacity of 20 GB, making it an excellent choice for users requiring a compact and efficient HDD. With a spindle speed of 5400 RPM, it balances speed and power consumption, catering to mobile computing and lower power devices. Its ATA interface ensures compatibility with a wide range of systems, making it a versatile option for various applications.

The MHD2032AT model offers a slightly higher capacity of 30 GB, maintaining similar technological attributes to its predecessor. With an enhanced data transfer rate, it allows for quicker access to stored files, perfect for users handling larger volumes of data. The robust error correction features in this model further ensure data integrity, making it a reliable choice for demanding environments.

For users needing more robust storage solutions, the MHC2032AT steps it up with features tailored for performance-heavy applications. Its 30 GB capacity is suited for desktop and workstation environments that require swift data retrieval and significant storage. The drive employs advanced caching techniques, which boost performance further by optimizing read and write operations, ensuring smoother multitasking capabilities.

The MHC2040AT is the flagship model in this line, providing an impressive storage capacity of 40 GB. This HDD is designed for high-performance applications where speed is crucial. The drive’s increased spindle speed and superior data transfer rates make it ideal for video editing, gaming, and large database management. Alongside its enhanced performance features, it includes advanced thermal management technology that maintains optimal operational temperatures, prolonging the drive's lifespan.

All four models leverage Fujitsu's commitment to data reliability, featuring robust shock resistance and low noise levels. Collectively, these drives cater to a spectrum of user needs, from compact data storage to high-capacity solutions, maintaining Fujitsu's reputation for quality and innovation in the storage market.
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