Electromagnetic Immunity; Reliability; Annualized Failure Rate (Afr) And Mean Time Between Failures (Mtbf) - Seagate CONSTELLATION.2 ST91000640NS Product Manual

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:
Table 4: Radio frequency environments
Test Description
Electrostatic Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV
discharge
Radiated RF 80 to 1,000 MHz, 3 V/m,
immunity 80% AM with 1 kHz sine
900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz
Electrical fast ± 1 kV on AC mains, ± 0.5 kV on external I/O
transient
Surge immunity ± 1 kV differential, ± 2 kV common, AC mains
Conducted RF 150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz sine A
immunity
Voltage dips, 0% open, 5 seconds
interrupts 0% short, 5 seconds
40%, 0.10 seconds
70%, 0.01 seconds
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 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.
AFR and MTBF specifications are based on the following assumptions for business critical storage system
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
outside the specifications in Section 3.8 will increase the product AFR and decrease MTBF.
Nonrecoverable read errors
Annualized Failure Rate (AFR)
Load unload cycles
Warranty
Preventive maintenance
20
15
1 per 10 bits read, max
0.62% (nominal power, 40°C case temperature)
300,000 cycles
To determine the warranty for a specific drive, use a web browser to access the fol-
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.
None required.
Performance level
B
A
B
B
C
C
C
B
Constellation.2 Serial ATA Product Manual, Rev. B
Reference standard
EN 61000-4-2: 95
EN 61000-4-3: 96
ENV 50204: 95
EN 61000-4-4: 95
EN 61000-4-5: 95
EN 61000-4-6: 97
EN 61000-4-11: 94
°
C. Temperatures