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Seagate ST9900805SS Savvio 10K.1 SCSI Product Manual - Page 35

Power dissipation

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6.3 Power dissipation ST973401 For drives using single-ended interface circuits, typical power dissipation under idle conditions is 5.07 watts (17.3 BTUs per hour). For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 5.02 watts (17.1 BTUs per hour). To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see Figures 6 and 7). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123. ST973401LC DC CURRENT/POWER vs THROUGHPUT (Single Ended) Random 8 Block Reads 1.400 14.00 5Vo lt A 1.200 12.00 12 Volt A Watts 1.000 10.00 0.800 8.00 Amperes Power (watts) 0.600 0.400 0.200 0.000 0.0 6.00 4.00 2.00 0.00 50.0 100.0 150.0 200.0 250.0 300.0 I/Os per Second Figure 6. ST973401 DC current and power vs. input/output operations per second (SE) ST973401LC DC CURRENT/POWER vs THROUGHPUT (Low Voltage Differential) Random 8 Block Reads 1.400 14.00 5Volt A 1.200 12.00 12 Vo lt A Watts 1.000 10.00 Amperes Power (watts) 0.800 8.00 0.600 6.00 0.400 4.00 0.200 2.00 0.000 0.0 0.00 50.0 100.0 150.0 200.0 250.0 300.0 I/Os per Second Figure 7. ST973401 DC current and power vs. input/output operations per second (LVD) Savvio SCSI Product Manual, Rev. D 29

Section	Page
1.0 Scope	7
2.0 Applicable standards and reference documentation	9
2.1 Standards	9
2.1.1 Electromagnetic compatibility	9
2.1.2 Electromagnetic susceptibility	9
2.2 Electromagnetic compliance	10
2.3 Reference documents	11
3.0 General description	13
3.1 Standard features	14
3.2 Media characteristics	14
3.3 Performance	14
3.4 Reliability	15
3.5 Formatted capacities	15
3.5.1 Programmable drive capacity	15
3.6 Factory installed accessories	15
3.7 Options (factory installed)	16
3.8 Accessories (user installed)	16
4.0 Performance characteristic	17
4.1 Internal drive characteristics (transparent to user)	17
4.2 SCSI performance characteristics (visible to user)	17
4.2.1 Access time [5]	17
4.2.2 Format command execution time (minutes) [1]	17
4.2.3 Generalized performance characteristics	18
4.3 Start/stop time	18
4.4 Prefetch/multi-segmented cache control	19
4.5 Cache operation	19
4.5.1 Caching write data	20
4.5.2 Prefetch operation	20
4.5.3 Optimizing cache performance for desktop and server applications	20
5.0 Reliability specifications	23
5.1 Error rates	23
5.1.1 Environmental interference	23
5.1.2 Read errors	24
5.1.3 Write errors	24
5.1.4 Seek errors	24
5.2 Reliability and service	24
5.2.1 Mean time between failure	24
5.2.2 Preventive maintenance	25
5.2.3 Service life	25
5.2.4 Service philosophy	25
5.2.5 Service tools	25
5.2.6 Hot plugging Savvio SCSI disc drives	25
5.2.7 S.M.A.R.T.	26
5.2.8 Thermal monitor	27
5.2.9 Drive Self Test (DST)	28
5.2.9.1 DST Failure Definition	28
5.2.9.2 Implementation	28
5.2.9.2.1 State of the drive prior to testing	28
5.2.9.2.2 Invoking DST	29
5.2.9.2.3 Short and extended tests	29
5.2.9.2.4 Log page entries	29
5.2.9.2.5 Abort	30
5.2.10 Product warranty	30
6.0 Physical/electrical specifications	31
6.1 AC power requirements	31
6.2 DC power requirements	31
6.2.1 Conducted noise immunity	32
6.2.2 Power sequencing	32
6.2.3 12 V - Current profile	32
6.3 Power dissipation	35
6.4 Environmental limits	37
6.4.1 Temperature	37
6.4.2 Relative humidity	38
6.4.3 Effective altitude (sea level)	38
6.4.4 Shock and vibration	38
6.4.4.1 Shock	38
6.4.4.2 Vibration	40
6.4.5 Air cleanliness	40
6.4.6 Corrosive environment	40
6.4.7 Acoustics	41
6.4.8 Electromagnetic susceptibility	41
6.5 Mechanical specifications	41
7.0 Defect and error management	43
7.1 Drive internal defects	43
7.2 Drive error recovery procedures	43
7.3 SCSI systems errors	44
8.0 Installation	45
8.1 Drive orientation	45
8.2 Cooling	45
8.3 Drive mounting	46
8.4 Grounding	46
9.0 Interface requirements	47
9.1 General description	47
9.2 SCSI interface messages supported	48
9.3 SCSI interface commands supported	49
9.3.1 Inquiry Vital Product data	53
9.3.2 Mode Sense data	53
9.4 SCSI bus conditions and miscellaneous features supported	57
9.5 Synchronous data transfer	57
9.5.1 Synchronous data transfer periods supported	58
9.5.2 REQ/ACK offset	58
9.6 Physical interface	58
9.6.1 DC cable and connector	58
9.6.2 SCSI interface physical description	59
9.6.3 SCSI interface cable requirements	60
9.6.3.1 Cable requirements	60
9.6.4 Mating connectors	60
9.6.4.1 Mating connectors	60
9.7 Electrical description	64
9.7.1 Multimode-SE and LVD alternatives	64
9.7.1.1 General cable characteristics	65
9.7.1.2 Single-ended drivers/receivers	65
9.8 Terminator requirements	65
9.8.1 Terminator power	65
9.9 Disc drive SCSI timing	66