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Fujitsu MHV2100BH, MHV2080BH, MHV2040BH Caching operation, Commands that are targets of caching

Models: MHV2100BH MHV2040BH MHV2060BH MHV2080BH

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Operations

6.4.2 Caching operation

The caching operation is performed only when the commands listed below are received. If any of the following data are stored on the data buffer, the data is sent to the host system.

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All of the sector data that this command processes.

A part of the sector data including the start sector, that this command processes.

If part of the data to be processed is stored on the data buffer, the remaining data is read from disk media and sent to the host system.

(1) Commands that are targets of caching

The commands that are targets of caching are as follows:

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READ SECTOR (S) (EXT)

READ MULTIPLE (EXT)

READ DMA (EXT)

READ FP DMA QUEUED

However, if the caching function is prohibited by the SET FEATURES command, the caching operation is not performed.

(2) Data that is a target of caching

The data that is a target of caching are as follows:

1)Read-ahead data that is read from disk media and saved to the data buffer upon completion of execution of a command that is a target of caching.

2)Pre-read data that is read from disk media and saved to the data buffer before execution of a command that is a target of caching.

3)Data required by a command that is a target of caching and has been sent to the host system one. If the sector data requested by the host has not been completely stored in the read cache portion of the buffer, this data does not become a target of caching. Also, If sequential hits occur continuously, the caching-target data required by the host becomes invalid because that data is overwrited by new data.

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Fujitsu MHV2100BH, MHV2080BH Caching operation, Commands that are targets of caching, Data that is a target of caching

Contents

MHV2100BH, MHV2080BH MHV2060BH, MHV2040BH Disk Drives Product Manual For Safe Operation Handling of This Manual Revision History This page is intentionally left blank Preface Overview of Manual Conventions Conventions for Alert MessagesOperating Environment Liability Exception This page is intentionally left blank Important Alert Items Important Alert Messages This page is intentionally left blank Disk Drives Product Manual Disk Drives Maintenance ManualManual Organization This page is intentionally left blank Contents Theory of Device Operation Device ConfigurationInstallation Conditions Contents Interface 3.1 101 Power Save Controlled by Interface Power Management IPM Operations Glossary GL-1 Acronyms and Abbreviations AB-1 Index IN-1 Illustrations Figures Response to power-on when the host is powered on Tables Examples of model names and product numbers Relationship between combination of Identifier This page is intentionally left blank Device Overview Adaptability FeaturesFunctions and performance Error correction and retry by ECC Low noise and vibrationHigh resistance against shock Connection to Sata interface Device Specifications Specifications summarySpecifications 1 MHV2100BH MHV2080BH MHV2060BH MHV2040BH Specifications 2 Model and product numberMHV2100BH Examples of model names and product numbers Ripple Power RequirementsInput Voltage Current Requirements and Power Dissipation Current and power dissipation Environmental Specifications Current fluctuation Typ. at +5 V when power is turned onPower on/off sequence Environmental specifications Acoustic noise specification Shock and vibration specificationAcoustic Noise Shock and Vibration Service life Data assurance in the event of power failureReliability Mean time between failures Mtbf Error Rate Unrecoverable read errorPositioning error Media Defects Advanced Power Management Recommended power-off sequence Advanced Power Management Device-initiated interface power management Dipm Interface Power Management IPMHost-initiated interface power management Hipm Interface power management Elimination of Hazardous Substances This page is intentionally left blank Device Configuration Device Configuration System Configuration Sata interfaceDrive connection Read/write circuit This page is intentionally left blank Installation Conditions Dimensions Dimensions Orientation MountingIntegration Guidance C141-E144 PCA FrameLimitation of mounting Location of breather Ambient temperature Service area Handling cautions Hios ESDSumitomo 3M Device connector Connections with Host System Recommended connector specifications for the host system Connector specifications for host systemSignal segment and power supply segment Sata interface cable connection This page is intentionally left blank Theory of Device Operation Outline SubassembliesDisk Spindle Circuit Configuration Air filterServo circuit Spindle motor driver circuit Power supply configuration PCA Power-on Sequence Power-on operation sequence Self-calibration contents Self-calibration Command processing during self-calibration Execution timing of self-calibration Read/write Circuit Read/write preamplifier PreAMPWrite circuit Write precompensation Programmable filter circuit Read circuitAGC circuit Digital PLL circuit FIR circuitD converter circuit Viterbi detection circuit Servo Control Servo control circuit Power amplifier Microprocessor unit MPUServo burst capture circuit A converter DAC Driver circuit VCM current sense resistor CSR Data-surface servo format Inner guard bandData area Outer guard band Physical sector servo configuration on disk surface Servo frame format Actuator motor control Operation to move the head to the reference cylinderSeek operation Track following operation Start mode Acceleration modeStable rotation mode Spindle motor control This page is intentionally left blank Interface Interface signals Physical Interface 5VDC/GND Comreset / CominitComwake Signal interface regulation Out of band signaling Align ContEOF Pmack RIP ROKRrdy SOF FER Electrical specificationsPhysical Layer Electrical Requirements 1/3 Physical Layer Electrical Requirements 2/3 Physical Layer Electrical Requirements 3/3 Connector pinouts Connector pinouts 5 P11 function Staggered Spin-upDriving Ready LED Requirements for P11 as an output pin Example of the circuit for driving Ready LED Hot Plug Conceptual diagram of communication layers Logical Interface Communication layers Physical layerLink layer Transport layer Outline of the Shadow Block Register Shadow Block Register Outline of the frame information structure FIS FIS typesRegister Host to Device Register Host to Device FIS layout Register Device to Host DMA Active Device to Host DMA Setup Device to Host or Host to Device Bidirectional TAG Bist Active Bidirectional Bist combinations Data Host to Device or Device to Host Bidirectional Data FIS Bidirectional layout Error Field Shadow block registersUNC Sfrr Features Field exp Sector Count Field expSector Number Field exp Cylinder Low Field exp Cylinder High Field exp Device/Head FieldHS3 HS2 HS1 HS0 HS3 Bit Device Write Fault DF bit Bit Error ERR bitStatus field Bit 7 Busy BSY bit Command Field Bit 2 Software Reset SrstDevice Control Field EStatus Field Command code and parameters 1/3 Host CommandsCommand code and parameters Command code and parameters 2/3 Command code and parameters 3/3 Command descriptions Error reporting conditions Recalibrate X’10’ to X’1F’ Read Sectors X’20’ or X’21’ LBA LSB LBA Write Sectors X’30’ or X’31’ 00 *1 Error information Write Verify X’3C’ Host Commands Read Verify Sectors X’40’ or X’41’ Host Commands Seek X’70’ to X’7F’ Execute Device Diagnostic X’90’ Diagnostic code Initialize Device Parameters X’91’ Download Microcode X’92’ Operation of Download Microcode Error reporting conditions Standby Immediate X’94’ or X’E0’ Idle Immediate X’95’ or X’E1’ Standby X’96’ or X’E2’ Idle X’97’ or X’E3’ Host Commands Check Power Mode X’98’ or X’E5’ ’FF’ Comreset Sleep X’99’ or X’E6’ Smart X’B0’ 10 Features Field values subcommands and functions 1/3 10 Features Field values subcommands and functions 2/3 Smart Enable OperationsSmart Disable Operations Smart Read LOG Smart Return Status 10 Features Field values subcommands and functions 3/3’DB’ Smart ENABLE/DISABLE Auto OFF-LINE Key C2h Key 4Fh 1FF 12 Format of guarantee failure threshold value data11 Format of device attribute value data Data format version number Attribute ID Status Flag Current attribute valueAttribute value for the worst case so far Raw attribute value 14 Self-test execution status 13 Off-line data collection statusSelf-test execution status 16 Failure prediction capability flag 17 Drive error logging capability15 Off-line data collection capability Guarantee failure threshold Smart error loggingChecksum 18 Log Directory Data Format 19 Data format of Smart Summary Error Log 1/2 19 Data format of Smart Summary Error Log 2/2 Command data structureError data structure Total number of drive errors 20 Data format of Smart Comprehensive Error Log Smart Self-Test 21 Smart self-test log data format 1FCSelf-test number Self-test index Current LBA under test 22 Selective self-test log data structureTest Span Feature Flags 23 Selective self-test feature flagsCurrent Span under test Selective Self-test pending time min Device Configuration XB1 Device Configuration RestoreDevice Configuration Freeze Device Configuration Identify Device Configuration Restore Features Field = C0h Device Configuration Freeze Lock Features Field = C1h Device Configuration Identify Features Field = C2h Device Configuration SET Features Field = C3h 24 Device Configuration Identify data structure 1/2 Word Value Content 24 Device Configuration Identify data structure 2/2 Read Multiple X’C4’ 10 Execution example of Read Multiple command LBA LSB Write Multiple X’C5’ At command issuance Shadow Block Registers setting contents SET Multiple Mode X’C6’ Interface Read DMA X’C8’ or X’C9’ LBA Write DMA X’CA’ or X’CB’ Interface Read Buffer X’E4’ Flush Cache X’E7’ Write Buffer X’E8’ Identify Device X’EC’ Identify Device DMA X’EE’ 25 Information to be read by Identify Device command 1/3 ’3FFF’ 25 Information to be read by Identify Device command 2/3 25 Information to be read by Identify Device command 3/3 MHV2100BH MHV2080BH Host Commands Word 59 Transfer sector count currently set by READ/WRITE Host Commands Interface Bit Interface Device always returns the fixed value indicated on the left Interface SET Features X’EF’ 26 Features field values and settable modes 1/2 26 Features field values and settable modes 2/2 Data Transfer Mode Advanced Power Management APM Serial ATA Functions Automatic Acoustic Management AAM 27 Contents of Security SET Password data Error reporting conditions Security UNLOCKX’F2’ When the master password is selectedWhen the user password is selected Host Commands Security Erase Prepare X’F3’ Security Erase Unit X’F4’ Security Freeze Lock X’F5’ Error reporting conditions 29 Contents of security password Error reporting conditions Read Native MAX Address X’F8’ Lbalsb SET MAX X’F9’ SET MAX Address SET MAX SET Password Features Field = 01h Password information SET MAX Lock Features Field = 02h SET MAX Unlock Features Field = 03h SET MAX Freeze Lock Features Field = 04h Read Sector S EXT X’24’ Description Read DMA EXT X’25’ Description Read Native MAX Address EXT X’27’ Read Multiple EXT X’29’ Read LOG EXT X2F Sector offset 30 Data format of Read Log Ext log page 10h 31 Tag field information 32 Data format of Read Log Ext log page 11h 33 Counter Identifier information Write Sector S EXT X’34’ Description Write DMA EXT X’35’ Description SET MAX Address EXT X’37’ SET MAX LBA Write Multiple EXT X’39’ Write LOG EXT X3F Error information C141-E224 137 Read Verify Sector S EXT X’42’ Flush Cache EXT X’EA’ Write Multiple FUA EXT XCE Write DMA FUA EXT X3D Read FP DMA Queued Write FP DMA Queued Error posting 34 Command code and parameters 1/2Command Name Sfrw Sfrr DWF 34 Command code and parameters 2/2TK0NF Command Protocol Non-data command protocolExecute Device Diagnostic Initialize Device Parameters Data Host PIO data-in command protocol PIO data-out command protocol 12 PIO data-in command protocol 13 PIO data-out command protocol DMA data-in command protocol Read DMA EXT Identfy Device Identfy Device DMA DMA data-out command protocol Write DMA EXT FUA EXT Native Command Queuing protocol Read FP DMA Queued Write FP DMA Queued 16 Read FP DMA Queued command protocol 17 Write FP DMA Queued command protocol Power-on and Comreset 18 Power-on sequence 19 Comreset sequence This page is intentionally left blank Operations Reset and Diagnosis Response to power-on Reset and Diagnosis Response to Comreset Response to Comreset Software settings preservation Comreset preservation requirements SET Address MAX EXT Response to a software reset Response to a software reset Power Save Power save modeActive mode Active idle mode Standby mode Sleep mode Power commands Partial mode Power Save Controlled by Interface Power Management IPMPower save mode of the interface Slumber mode MB buffer Read-ahead CacheData buffer structure Data that is a target of caching Commands that are targets of cachingCaching operation Invalidating caching-target data Using the read segment buffer Miss-hit Sequential hit Full hit HAP end location of the previous read command Partial hit Command that are targets of caching Write CacheCache operation Invalidation of cached data Status report in the event of an error Comreset and software reset responseCashing function when power supply is turned on Enabling and disabling This page is intentionally left blank Glossary Power save mode Host receptacleMaster Device PIO Programmed input-output Rotational delay Seek timeSerial-ATA Slave Device This page is intentionally left blank Acronyms and Abbreviations This page is intentionally left blank Index Caching Index Example of model name and product Mean time between failure Mtbf Read Native MAX Address 4-3 Status, off-line data collection Comment Form Japan This page is intentionally left blank C141-E224-01EN This page is intentionally left blank