Fujitsu MHE2064AT User Manual Page 55
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Theory of Device Operation
4-2 C141-E057-02EN
4.1 Outline
This chapter consists of two parts. First part (Section 4.2) explains mechanical
assemblies of the disk drive. Second part (Sections 4.3 through 4.7) explains a
servo information recorded in the disk drive and drive control method.
4.2 Subassemblies
The disk drive consists of a disk enclosure (DE) and printed circuit assembly
(PCA).
The DE contains all movable parts in the disk drive, including the disk, spindle,
actuator, read/write head, and air filter. For details, see Subsections 4.2.1 to 4.2.5.
The PCA contains the control circuits for the disk drive. The disk drive has one
PCA. For details, see Sections 4.3.
4.2.1 Disk
The DE contains disks with an outer diameter of 65 mm and an inner diameter of
20 mm. The MHE2064AT have three disks and MHE2043AT have two disks and
MHF2043AT have two disks and MHF2021AT have one disk.
The head contacts the disk each time the disk rotation stops; the life of the disk is
50,000 contacts or more. Servo data is recorded on top disk.
Servo data is recorded on each cylinder (total 60). Servo data written at factory is
read out by the read/write head. For servo data, see Section 4.7.
4.2.2 Head
Figure 4.1 shows the read/write head structures. MHE2064AT has 6 read/write
heads and MHE2043AT has 4 read/write heads and MHF2043AT has 4 read/write
heads and MHF2021AT has 2 read/write head. These heads are raised from the
disk surface as the spindle motor the rated rotation speed.
- MHE2064AT, MHE2043AT 1
- MHF2043AT, MHF2021AT 1
- DISK DRIVE 1
- PRODUCT MANUAL 1
- FOR SAFE OPERATION 2
- Revision History 4
- Overview of Manual 6
- Operating Environment 7
- Attention 7
- Liability Exception 8
- Important Alert Items 10
- Manual Organization 12
- Contents 14
- Illustrations 19
- CHAPTER 1 Device Overview 22
- 1.1 Features 23
- 1.1.3 Interface 24
- 1.2 Device Specifications 25
- 1.3 Power Requirements 27
- 1.5 Acoustic Noise 30
- 1.6 Shock and Vibration 30
- 1.7 Reliability 31
- 1.8 Error Rate 32
- 1.9 Media Defects 32
- C141-E057-01EN 2-1 34
- 2.1 Device Configuration 34
- 2.2 System Configuration 34
- 3.1 Dimensions 41
- 3.1 Dimensions 42
- C141-E057-01EN 3-3 42
- 3.2 Mounting 43
- 3.3 Cable Connections 47
- 3.3.3 Device connection 48
- 3.4 Jumper Settings 49
- 3.4.2 Factory default setting 50
- 3.4.4 CSEL setting 51
- 3.4 Jumper Settings 52
- C141-E057-01EN 3-13 52
- 4.1 Outline 55
- 4.2 Subassemblies 55
- 4.2.3 Spindle 56
- 4.2.4 Actuator 56
- 4.2.5 Air filter 56
- 4.3 Circuit Configuration 57
- 4.3 Circuit Configuration 58
- C141-E057-01EN 4-5 58
- 4.4 Power-on Sequence 59
- 4.5 Self-calibration 60
- • The power is turned on 61
- 4.6 Read/write Circuit 62
- 4.6.2 Write circuit 63
- 4.6 Read/write Circuit 64
- C141-E057-01EN 4-11 64
- 4.6.3 Read circuit 65
- 4.6.4 Digital PLL circuit 66
- 4.7 Servo Control 67
- Servo frame 69
- (60 servo frames 69
- 4.7.3 Servo frame format 71
- 4.7.4 Actuator motor control 72
- 4.7.5 Spindle motor control 73
- CHAPTER 5 Interface 76
- 5.1 Physical Interface 77
- 5.2 Logical Interface 81
- 5.2.1 I/O registers 82
- 5.2.2 Command block registers 83
- 5.3 Host Commands 88
- 5.3.2 Command descriptions 91
- → with Retry 96
- → without Retry 96
- (CM) 1 1 1 1 0 1 0 0 124
- • Data format version number 135
- • Attribute ID 135
- • Status Flag 136
- • Current attribute value 136
- • Raw attribute value 136
- • Current segment pointer 137
- • Check sum 138
- • Insurance failure threshold 138
- • SECURITY SET PASSWORD 141
- • SECURITY UNLOCK 141
- • SECURITY DISABLE PASSWORD 141
- • SECURITY ERASE UNIT 141
- 5.3.3 Error posting 146
- 5.4 Command Protocol 148
- 5.4.4 Other commands 153
- 5.5 Ultra DMA Feature Set 155
- 5.5.2 Phases of operation 156
- 5.6 Timing 170
- Interface 171
- 5-96 C141-E057-01EN 171
- 5.6 Timing 172
- C141-E057-01EN 5-97 172
- 5-98 C141-E057-01EN 173
- 5.6.5 Power-on and reset 186
- CHAPTER 6 Operations 188
- 6.1.1 Response to power-on 189
- C141-E057-01EN 6-3 190
- 6 seconds 193
- 6.2 Address Translation 194
- 6.2.2 Logical address 195
- 6.3 Power Save 196
- 6.4 Defect Management 198
- 6.4.1 Spare area 199
- 6.5 Read-Ahead Cache 201
- − WRITE SECTOR(S) 202
- − WRITE DMA 202
- − WRITE MULTIPLE 202
- − READ SECTOR (S) 202
- − READ DMA 202
- 6.5.3 Usage of read segment 203
- Empty areaMis-hit data 205
- Start LBALast LBA 205
- Read-ahead data 205
- Start LBA 208
- Last LBA 208
- 6.6 Write Cache 209
- • WRITE SECTOR(S) 210
- • WRITE MULTIPLE 210
- • WRITE DMA 210
- Glossary 212
- Acronyms and Abbreviations 216
- Comment Form 223
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