Seagate ST91000640NS manual Electromagnetic immunity, Reliability, Radio frequency environments

3.11Electromagnetic 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	Performance level	Reference standard
Electrostatic		Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV	B	EN 61000-4-2: 95
discharge
Radiated RF		80 to 1,000 MHz, 3 V/m,	A	EN 61000-4-3: 96
immunity		80% AM with 1 kHz sine		ENV 50204: 95
		900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz
Electrical fast		± 1 kV on AC mains, ± 0.5 kV on external I/O	B	EN 61000-4-4: 95
transient
Surge immunity		± 1 kV differential, ± 2 kV common, AC mains	B	EN 61000-4-5: 95
Conducted RF		150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz sine	A	EN 61000-4-6: 97
immunity
Voltage dips,		0% open, 5 seconds	C	EN 61000-4-11: 94
interrupts		0% short, 5 seconds	C
		40%, 0.10 seconds	C
		70%, 0.01 seconds	B

3.12Reliability

3.12.1Annualized 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°C. Temperatures outside the specifications in Section 3.8 will increase the product AFR and decrease MTBF.

Nonrecoverable read errors	1 per 1015 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:
	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.
Preventive maintenance	None required.

20 Constellation.2 Serial ATA Product Manual, Rev. B