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5.3 Host Commands
(3) WRITE SECTOR(S) (X’30’ or X’31’)
This command writes data of sectors from the address specified in the
Device/Head, Cylinder High, Cylinder Low, and Sector Number registers to the
address specified in the Sector Count register. Number of sectors can be specified
from 1 to 256 sectors. A sector count of 0 requests 256 sectors. Data transfer
begins at the sector specified in the Sector Number register. For the DRQ,
INTRQ, and BSY protocols related to data transfer, see Subsection 5.4.2.
If the head is not on the track specified by the host, the device performs an implied
seek. After the head reaches to the specified track, the device writes the target
sector.
If an error occurs when writing to the target sector, retries are attempted
irrespectively of the R bit setting.
The data stored in the buffer, and CRC code and ECC bytes are written to the data
field of the corresponding sector(s). Upon the completion of the command
execution, the command block registers contain the cylinder, head, and sector
addresses of the last sector written.
If an error occurs during multiple sector write operation, the write operation is
terminated at the sector where the error occurred. Command block registers
contain the cylinder, the head, the sector addresses (in the CHS mode) or the
logical block address (in the LBA mode) of the sector where the error occurred.
At command issuance (I/O registers setting contents)
1F7
H
(CM) 0 0 1 1 0 0 0 R
1F6
H
(DH) x L x DV Start head No. / LBA [MSB]
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(FR)
Start cylinder No. [MSB] / LBA
Start cylinder No. [LSB] / LBA
Start sector No. / LBA [LSB]
Transfer sector count
xx
C141-E258 5-23
- MHW2060AC, MHW2040AC 1
- DISK DRIVES 1
- PRODUCT MANUAL 1
- FOR SAFE OPERATION 2
- Revision History 3
- Preface 5
- Operating Environment 6
- Conventions 6
- Attention 7
- Liability Exception 7
- Important Alert Items 9
- Manual Organization 11
- Contents 13
- Illustrations 19
- CHAPTER 1 Device Overview 23
- 1.1 Features 24
- 1.1.3 Interface 25
- 1.2 Device Specifications 26
- 1.3 Power Requirements 29
- 1.5 Acoustic Noise 33
- 1.6 Shock and Vibration 33
- 1.7 Reliability 34
- 1.8 Error Rate 35
- 1.9 Media Defects 35
- 1.10 Load/Unload Function 35
- 2.1 Device Configuration 40
- 2.2 System Configuration 41
- 2.2.3 2 drives connection 42
- 3.1 Dimensions 44
- 3.2 Mounting 45
- Connector 50
- 3.3.3 Device connection 51
- 3.4 Jumper Settings 52
- 3.4.4 CSEL setting 54
- 4.1 Outline 58
- 4.2 Subassemblies 58
- 4.3 Circuit Configuration 59
- C141-E258 4-5 61
- 4.4 Power-on Sequence 62
- 4.5 Self-calibration 63
- 4.6 Read/write Circuit 65
- 4.6.3 Read circuit 66
- 4.6.4 Digital PLL circuit 67
- 4.7 Servo Control 68
- Theory of Device Operation 72
- 4-16 C141-E258 72
- 4.7.3 Servo frame format 73
- 4.7.5 Spindle motor control 75
- CHAPTER 5 Interface 77
- 5.1 Physical Interface 78
- 5.2 Logical Interface 82
- 5.2.1 I/O registers 83
- 5.3 Host Commands 90
- 5.3.2 Command descriptions 94
- • Default function 110
- • Unload Feature: 110
- • Attribute ID 123
- • Raw attribute value 124
- • Status Flag 124
- • Current attribute value 124
- • Error logging capability 127
- • Check sum 127
- • SMART error logging 128
- • Command data structure 130
- • Error data structure 130
- • Status 130
- • SMART self-test 131
- • Self-test number 131
- • Self-test index 131
- • Test span 132
- • Current LBA under test 132
- • Current span under test 132
- • Feature Flags 133
- (CM) 1 1 1 0 0 1 0 0 149
- • SET MAX ADDRESS 180
- Password information 182
- • SET MAX SET PASSWORD 184
- • SET MAX LOCK 184
- • SET MAX UNLOCK 184
- • Description 186
- 5.3.3 Error posting 203
- Interface 204
- 5-128 C141-E258 204
- 5.4 Command Protocol 205
- (*) Transfers dummy data 207
- 5.4.4 Other commands 211
- 5.5 Ultra DMA Feature Set 213
- 5.5.2 Phases of operation 214
- 5.5.5 Ultra DMA CRC rules 223
- 5.6 Timing 225
- 5.6.4 Power-on and reset 240
- CHAPTER 6 Operations 241
- 6.1.1 Response to power-on 242
- 6.2 Power Save 247
- 6.3 Defect Processing 249
- Sector (physical) 250
- Cylinder 0 250
- (Not used) 250
- 779 780 251
- 6.4 Read-ahead Cache 252
- For MPU work For R/W command 252
- 8,388,608 bytes 252
- 6.4.2 Caching operation 253
- 256
- 6.5 Write Cache 258
- Glossary 261
- Acronyms and Abbreviations 265
- Comment Form 273
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