Seagate ST9120410ASG ユーザーズマニュアル
14
Momentus 7200.4 SATA Product Manual, Rev. C
2.12
Electromagnetic immunity
When properly installed in a representative host system, the drive operates without errors or degradation in
performance when subjected to the radio frequency (RF) environments defined in the following table:
performance when subjected to the radio frequency (RF) environments defined in the following table:
2.13
Reliability
Measurement type
Specification
Nonrecoverable read errors
1 per 10
14
bits read, max.
Annualized Failure Rate (AFR)
0.5%
Load/Unload (U/UL)
25°C, 50% relative humidity
32°C, 80% relative humidity
5°C, 80% relative humidity
5°C, 10% relative humidity
55°C, 16% relative humidity
600,000 software-controlled power on/off cycles
50,000 hard power on/off cycles
600,000 software-controlled power on/off cycles
50,000 hard power on/off cycles
Warranty
For information regarding Warranty Support, visit
http://www.seagate.com/www/en-us/support/warranty_&_returns_assistance
2.13.1
Free Fall Protection feature
The Free Fall Protection feature provides enhanced data protection against shock events that may occur while
the drive is operating. This feature is designed to decrease the likelihood of data loss by detecting a free fall
event and unloading the actuator before a shock takes place in falls of >8 inches (nominal). The drive uses a
0G sensor mounted on the printed circuit board assembly (PCBA) to sense this event.
the drive is operating. This feature is designed to decrease the likelihood of data loss by detecting a free fall
event and unloading the actuator before a shock takes place in falls of >8 inches (nominal). The drive uses a
0G sensor mounted on the printed circuit board assembly (PCBA) to sense this event.
To enable the Free Fall Protection feature on ST9500420ASG, ST9320423ASG, ST9250410ASG,
ST9160412ASG, ST9120410ASG and ST980412ASG models, use Set Features command 41h. To disable
this feature, use Set Features command C1h.
ST9160412ASG, ST9120410ASG and ST980412ASG models, use Set Features command 41h. To disable
this feature, use Set Features command C1h.
Information about Free Fall Events that have occurred is available through SMART Attribute FEh.
Note.
The Free Fall Protection feature is provided only on ST9500420ASG, ST9320423ASG,
ST9250410ASG, ST9160412ASG, ST9120410ASG and ST980412ASG models.
ST9250410ASG, ST9160412ASG, ST9120410ASG and ST980412ASG models.
Table 6:
Radio frequency environments
Test
Description
Performance
level
level
Reference
standard
standard
Electrostatic discharge
Contact, HCP, VCP:
± 4
kV; Air:
± 8 kV
B
EN 61000-4-2: 95
Radiated RF immunity
80 to 1,000 MHz, 3 V/m,
80% AM with 1 kHz sine
900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz
A
EN 61000-4-3: 96
ENV 50204: 95
Electrical fast transient
± 1 kV on AC mains, ± 0.5 kV on external I/O
B
EN 61000-4-4: 95
Surge immunity
± 1 kV differential, ± 2 kV common, AC mains
B
EN 61000-4-5: 95
Conducted RF immunity
150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz
sine
sine
A
EN 61000-4-6: 97
Power Frequency H-field
immunity
immunity
1 A/m, 50Hz/60Hz, 3 axes
A
EN 61000-4-8: 97
Voltage dips, interrupts
30% Reduction for 25 cycles
>95% Reduction for 250 cycles
>95%, 0.5 cycles
C
C
B
EN 61000-4-11: 94