Partially hit data Lack data | Fujitsu MPC3045AH, MPC3065AH guide

2) The disk drive transfers the requested data but does not perform the read-ahead operation.

HAP (stopped)

Cache data

Full hit data

Cache data

3)The cache data for next read command is as follows.

Cache data

Start LBA

Last LBA

(4)Partially hit

A part of requested data including a lead sector are stored in the data buffer. The disk drive starts the data transfer from the address of the hit data corresponding to the lead sector of the requested data, and reads remaining requested data from the disk media directly.

Following is an example of partially hit to the cache data.

Cache data

Start LBA

Last LBA

1)The disk drive sets the HAP to the address where the partially hit data is stored, and sets the DAP to the address just after the partially hit data.

HAP

Partially hit data

Lack data

DAP

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C141-E056-02EN

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Fujitsu MPC3045AH, MPC3065AH manual Partially hit data Lack data

Contents

MPC3045AH MPC3065AH Disk Drives Product Manual Revision Record This page is intentionally left blank Chapter Preface Conventions for Alert Messages Liability Exception This page is intentionally left blank Contents Interface Theory of Device OperationPage Operations Figures Page Tables This page is intentionally left blank Device Overview Features Functions and performance Interface AdaptabilityPage MPC3045AH MPC3065AH Device Specifications Specifications summarySpecifications MPC3045AH Model and product numberModel names and product numbers Current and power dissipation Current fluctuation Typ. when power is turned on Drive Ready Acoustic noise specification Shock and vibration specification Error Rate Disk drive outerview Device Configuration System Configuration Configuration of disk media heads 2 1 drive connection System Configuration ATA interface 3 2 drives connection 2 drives configuration Dimensions Mounting Cable Connections Jumper Settings Installation Conditions Dimensions Orientation PCA Limitation of side-mountingPage Service area ATA Cable Connections Device connector Device connection Cable connector specificationsSpecters Strip AMP CN1 Power supply connector CN1+12V Return +5V Return 11 Factory default setting Jumper configuration Factory default setting 14 Example 1 of Cable Select 13 Jumper setting of Cable Select 408 Disk Outline Air filter HeadActuator Circuit Configuration MPC30xxAH Block diagram Power-on Sequence Power-on operation sequence Self-calibration contents Command processing during self-calibration Self-calibration execution timechart Write precompensation algorithm Read/write preamplifier PreAMPWrite circuit Read/write circuit block diagram Read circuit Frequency characteristic of programmable filter PR4 signal transfer Time base generator circuit Write clock frequency and transfer rate of each zone Servo control circuit Physical sector servo configuration on disk surface Page PAD Data-surface servo formatServo frame format Actuator motor control Spindle motor control Page This page is intentionally left blank Interface Physical Interface Interface signals Intrq Pdiag DA1 DA2 DA0 Signal assignment on the connectorSignal assignment on the interface connector Reset Intrq DiorHdmardy Hstrobe Ddmardy Iordy 1 I/O registers DA2 DA1 DA0 I/O registers Icrc UNC Idnf Abrt TK0NF Amnf Command block registersPage DEV HS3 HS2 HS1 HS0 BSY Drdy DSC DRQ ERR Page Srst Control block registers Command code and parameters 1 Command code and parameters Command code and parameters 2 LBA LSB Command descriptionsLBA 1F2 HSC Transfer sector count 1F1 HFR = 0 or C141-E056-01EN Read Multiple XC4 BSY Drdy Intrq DRQ Execution example of Read Multiple command 1F2 HSC Transfer sector count 1F1 HFR = 0 or C141-E056-01EN LBA LBA Write Multiple XC5 LBA LSB Write Verify X3C LBA 1F4 HCL Cylinder No. LSB / LBA 1F3 HSN Sector No Identify Device XEC Initialize Device ParametersPage Information to be read by Identify Device command 1 Information to be read by Identify Device command 2 Information to be read by Identify Device command 3 Identify Device DMA XEE SET Features XEF ‘CC’ Features register values and settable modes‘AA’ ‘BB’ SET Multiple Mode XC6 Page Diagnostic code Page LBA LBA Write Buffer XE8 Page Page Page Page XFF Page ’DA’ Features Register values subcommands and functionsPage 1FE 1FF Format of device attribute value data 10 Format of insurance failure threshold value data Page Page Page 11 Contents of security password Page Page Page Page 12 Contents of Security SET Password data Page Page 14 Command code and parameters Error posting ∙ Identify Device ∙ Read Sectors ∙ Read Long ∙ Read Buffer ∙ Execute Device Diagnostic ∙ Initialize Device ParametersData transferring commands from device to host IOR BSYDrdy DRQ Intrq DRQ Intrq BSY Drdy DRQ Intrq Write Sectors command protocol BSY Drdy Intrq Commands without data transfer ∙ Read DMA ∙ Write DMA ∙ Identify Device DMA Other commandsDMA data transfer commands ∙ Read Multiple ∙ Sleep ∙ Write Multiple IOW DRQ Dmarq Dmack Ultra DMA feature set Overview Phases of operation Data in transfer Pausing an Ultra DMA data in burst Terminating an Ultra DMA data in burst Page Page Data out transfer Pausing an Ultra DMA data out burst Terminating an Ultra DMA data out burst Page Ultra DMA CRC rules DIOW-STOP Series termination required for Ultra DMA15 Recommended series termination for Ultra DMA DIOR-HDMARDY-HSTROBE DIOR-/DIOW Timing PIO data transfer Dmarq Dmack DIOR-/DIOW Multiword data transfer 10 Initiating an Ultra DMA data in burst Ultra DMA data transfer Dmardy Name Mode Comment MIN MAX 16 Ultra DMA data burst timing requirements 2 11 Sustained Ultra DMA data in burst Sustained Ultra DMA data in burst 12 Host pausing an Ultra DMA data in burst Host pausing an Ultra DMA data in burst 13 Device terminating an Ultra DMA data in burst Device terminating an Ultra DMA data in burst 14 Host terminating an Ultra DMA data in burst Host terminating an Ultra DMA data in burst 15 Initiating an Ultra DMA data out burst 16 Sustained Ultra DMA data out burst Sustained Ultra DMA data out burst 17 Device pausing an Ultra DMA data out burst Device pausing an Ultra DMA data out burst 18 Host terminating an Ultra DMA data out burst Host terminating an Ultra DMA data out burst 19 Device terminating an Ultra DMA data out burst Pdiag Dasp Power-on and resetBSY Dasp Operations Response to power-on Response to hardware reset Response to software reset Response to diagnostic command MPC3065AH MPC3045AH Default parameters Logical address Address translation example in CHS mode Power save mode Address translation example in LBA mode Power SavePage Power commands Alternating defective sectors Spare area Track slip processing SP SP Automatic Alternate assignment 10 Data buffer configuration Data buffer configuration ∙ Read Sectors ∙ Read DMA ∙ Read Multiple Caching operation∙ Read Sector S ∙ Read Multiple ∙ Read DMA DAP Usage of read segmentHAP Mis-hit data Empty data Read-ahead data HAP set to hit position for data transfer Partially hit data Lack data Requested data to be transferred Write Cache ∙ Write Sectors ∙ Write Multiple ∙ Write DMA Fujitsu Canada INC Fujitsu Limited