Seagate ST9250612NS ユーザーズマニュアル
20
Constellation.2 Serial ATA Product Manual, Rev. B
3.11
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:
3.12
Reliability
3.12.1
Annualized Failure Rate (AFR) and Mean Time Between Failures (MTBF)
The product shall achieve an Annualized Failure Rate - AFR - of 0.62% (Mean Time Between Failures - MTBF
- of 1.4 Million hrs) when operated in an environment that ensures the HDA case temperatures do not exceed
40
- of 1.4 Million hrs) when operated in an environment that ensures the HDA case temperatures do not exceed
40
°
C. Operation at case temperatures outside the specifications in Section 3.9 may increase the product Annu-
alized Failure Rate (decrease MTBF). AFR and MTBF are population statistics that are not relevant to individ-
ual units.
ual units.
AFR and MTBF specifications are based on the following assumptions for business critical storage system
environments:
environments:
• 8760 power-on-hours per year.
• 250 average motor start/stop cycles per year.
• Operations at nominal voltages.
• Systems will provide adequate cooling to ensure the case temperatures do not exceed 40
°
C. Temperatures
outside the specifications in Section 3.8 will increase the product AFR and decrease MTBF.
Nonrecoverable read errors
1 per 10
15
bits read, max
Annualized Failure Rate (AFR)
0.62% (nominal power, 40°C case temperature)
Load unload cycles
300,000 cycles
Warranty
To determine the warranty for a specific drive, use a web browser to access the fol-
lowing web page:
lowing web page:
http://www.seagate.com/www/en-us/support/warranty_&_returns_assistance
From this page, click on the “Verify Your Warranty” link. You will be asked to provide
the drive serial number, model number (or part number) and country of purchase.
The system will display the warranty information for your drive.
the drive serial number, model number (or part number) and country of purchase.
The system will display the warranty information for your drive.
Preventive maintenance
None required.
Table 4:
Radio frequency environments
Test
Description
Performance level
Reference standard
Electrostatic
discharge
discharge
Contact, HCP, VCP: ± 4
kV; Air:
± 8 kV
B
EN 61000-4-2: 95
Radiated RF
immunity
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
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
immunity
150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz sine
A
EN 61000-4-6: 97
Voltage dips,
interrupts
interrupts
0% open, 5 seconds
0% short, 5 seconds
40%, 0.10 seconds
70%, 0.01 seconds
C
C
C
B
EN 61000-4-11: 94