Fujitsu MHE2064AT User Manual Page 31
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Device Overview
1-10 C141-E057-01EN
1.7 Reliability
(1) Mean time between failures (MTBF)
Conditions of 300,000 h
Current time
250H/month or less 3000H/years
or less
Operating time
20% or less of current time
CSS operations
50/day or less
Total 50,000 or less
Power on/off
1/day or more needed.
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
“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).
- 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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