Fujitsu MHT2040BH Manuel d'utilisateur Page 32
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Device Overview
1-10 C141-E203-01EN
1.7 Reliability
(1) Mean time between failures (MTBF)
Conditions of 300,000 h Power-on time 250H/month or less 3000H/years
or less
Operating time 20 % or less of power-on time
Environment 5 to 55 °C/8 to 90 %
But humidity bulb temperature
29 °C or less
MTBF is defined as follows:
Total operation time in all fields
MTBF= (H)
number of device failure in all fields (*1)
*1 “Disk drive defects” refers to defects that involve repair, readjustment, or
replacement. Disk drive defects do not include failures caused by external
factors, such as damage caused by handling, inappropriate operating
environments, defects in the power supply host system, or interface cable.
(2) Mean time to repair (MTTR)
The mean time to repair (MTTR) is 30 minutes or less, if repaired by a specialist
maintenance staff member.
(3) Service life
In situations where management and handling are correct, the disk drive requires
no overhaul for five years when the DE surface temperature is less than 48 °C.
When the DE surface temperature exceeds 48 °C, the disk drives requires no
overhaul for five years or 20,000 hours of operation, whichever occurs first.
Refer to item (3) in Subsection 3.2 for the measurement point of the DE surface
temperature. Also the operating conditions except the environment temperature
are based on the MTBF conditions.
(4) Data assurance in the event of power failure
Except for the data block being written to, the data on the disk media is assured in
the event of any power supply abnormalities. This does not include power supply
abnormalities during disk media initialization (formatting) or processing of
defects (alternative block assignment).
- 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 28
- 1.5 Acoustic Noise 31
- 1.6 Shock and Vibration 31
- 1.7 Reliability 32
- 1.8 Error Rate 33
- 1.9 Media Defects 33
- 1.10 Load/Unload Function 33
- This page is intentionally 38
- blank 38
- 2.1 Device Configuration 40
- 2.2 System Configuration 41
- 3.1 Dimensions 44
- 3.2 Mounting 45
- Installation Conditions 48
- (4) Ambient temperature 48
- Mounting screw hole 49
- Cable connection 49
- Shock absorbing mat 50
- ESD mat 50
- Wrist strap 50
- 3.3.1 Device connector 51
- 4.1 Outline 56
- 4.2 Subassemblies 56
- 4.3 Circuit Configuration 57
- C141-E203-01EN 4-5 59
- 4.4 Power-on Sequence 60
- 4.5 Self-calibration 61
- 4.6 Read/write Circuit 63
- 4.6.3 Read circuit 64
- 4.6.4 Digital PLL circuit 65
- 4.7 Servo Control 66
- Diameter 69
- 4.7.3 Servo frame format 70
- 4.7.5 Spindle motor control 72
- CHAPTER 5 Interface 75
- 5.1 Physical Interface 76
- COMRESET/COMINIT 78
- 106.7 ns 78
- 106.7 ns 106.7 ns 78
- ACcoupling 81
- 5.1.4 Connector pinouts 82
- Host located layers 83
- Device located layers 83
- 5.2.1 Communication layers 84
- 5.3 Host Commands 96
- 5.3 Host Commands 97
- C141-E203-01EN 5-23 97
- 5.3.2 Command descriptions 99
- Interface 144
- 5-70 C141-E203-01EN 144
- Word Value Content 144
- ' 0000 ' Reserved 163
- Bit 0: Reserved 166
- 01h (*1) 175
- Status information 188
- Password information 189
- Sector offset (7-0) 198
- 5.3.3 Error posting 213
- 5.4 Command Protocol 215
- • READ DMA (EXT) 220
- • IDENTFY DMA 220
- • WRITE DMA (EXT) (FUA EXT) 221
- 5-150 C141-E203-01EN 224
- 5-152 C141-E203-01EN 226
- CHAPTER 6 Operations 227
- 6.1 Reset and Diagnosis 228
- 6.1 Reset and Diagnosis 229
- C141-E203-01EN 6-3 229
- earlier than the host) 229
- 6.1.2 Response to COMRESET 230
- 6.2 Power Save 232
- 6.2.2 Power commands 234
- 6.3 Interface Power Save 235
- 6.4.1 Data buffer structure 237
- 6.4.2 Caching operation 238
- 241
- 6.5 Write Cache 244
- IMPORTANT 245
- Glossary 247
- Acronyms and Abbreviations 249
- Comment Form 259
- DISK DRIVES PRODUCT MANUAL 261
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