Seagate ST92505610AS manual Electromagnetic immunity, Reliability, Radio frequency environments

*During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and power to operational levels.

Test for Prominent Discrete Tones (PDTs)

Seagate follows the ECMA-74 standards for measurement and identification of PDTs. An exception to this pro- cess is the use of the absolute threshold of hearing. Seagate uses the lower limit for the threshold curve* to discern tone audibility and to compensate for the inaudible components of sound prior to computation of tone ratios according to Annex D of the ECMA-74 standards.

*Defined as the median curve given by ISO 389-7 (Tf curve) minus 10dB at all frequencies.

2.12Electromagnetic 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 6:	Radio frequency environments
			Performance	Reference
Test		Description	level	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,	A	EN 61000-4-3: 96
		80% AM with 1 kHz sine		ENV 50204: 95
		900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz
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	A	EN 61000-4-6: 97
		sine
Power Frequency H-field		1 A/m, 50Hz/60Hz, 3 axes	A	EN 61000-4-8: 97
immunity
Voltage dips, interrupts		30% Reduction for 25 cycles	C	EN 61000-4-11: 94
		>95% Reduction for 250 cycles	C
		>95%, 0.5 cycles	B

2.13	Reliability
Measurement type		Specification
Nonrecoverable read errors		1 per 1014 bits read, max.
Annualized Failure Rate (AFR)		0.5%
Load/Unload (U/UL)
25°C, 50% relative humidity		600,000 software-controlled power on/off cycles
		50,000 hard power on/off cycles
32°C, 80% relative humidity		600,000 software-controlled power on/off cycles
5°C, 80% relative humidity		50,000 hard power on/off cycles
5°C, 10% relative humidity
55°C, 16% relative humidity
Warranty		To determine the warranty for a specific drive, use a web browser to access the
		following web page: support.seagate.com/customer/warranty_validation.jsp
		You will be asked to provide the drive serial number, model number (or part num-
		ber) and country of purchase. After submitting this information, the system will dis-
		play the warranty information for your drive

14 Momentus XT Product Manual, Rev. B