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Seagate ST3300457FC Cheetah 15K.6 SAS Product Manual - Page 15

Performance characteristics

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4.0 Performance characteristics This section provides detailed information concerning performance-related characteristics and features of Cheetah 15K.6 drives. 4.1 Internal drive characteristics Drive capacity ST3450856SS ST3300656SS ST3146356SS ST3450056SS ST3300056SS ST3146756SS 450 300 146 Gbytes (formatted, rounded off value)* Read/write data heads 8 6 3 Tracks per inch 150,000 150,000 150,000 TPI Peak bits per inch Areal Density 1,100 165 1,100 165 1,100 165 KBPI Gbits/inch2 Internal data rate 1.95 1.95 1.95 Gbits/sec (max) disk rotation speed 15k 15k 15k RPM Avg rotational latency 2.0 2.0 2.0 msec *One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment and formatting. 4.2 Seek time See Section 9.4.1, "SAS physical interface" on page 62 and the SAS Interface Manual (part number 100293071) for additional timing details. 4.2.1 Access time Not Including controller overhead1, 2 (msec) Read Write Average Typical 3.4 3.9 Single track Typical 0.20 0.44 Full stroke Typical 6.43 7.12 1. Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as measured on a representative sample of drives. 2. Access to data = access time + latency time. Cheetah 15K.6 SAS Product Manual, Rev. B 11

Section	Page
1.0 Scope	5
2.0 Standards, compliance and reference documents	7
2.1 Standards	7
2.1.1 Electromagnetic compatibility	7
2.1.1.1 Electromagnetic susceptibility	7
2.2 Compliance	8
2.2.1 Electromagnetic compliance	8
2.3 European Union Restriction of Hazardous Substances (RoHS)	8
2.4 Reference documents	9
3.0 General description	11
3.1 Standard features	12
3.2 Media description	12
3.3 Performance	12
3.4 Reliability	13
3.5 Formatted capacities	13
3.6 Programmable drive capacity	13
3.7 Factory-installed options	13
4.0 Performance characteristics	15
4.1 Internal drive characteristics	15
4.2 Seek time	15
4.2.1 Access time	15
4.2.2 Format command execution time (minutes)	16
4.2.3 General performance characteristics	16
4.3 Start/stop time	16
4.4 Prefetch/multi-segmented cache control	17
4.5 Cache operation	17
4.5.1 Caching write data	18
4.5.2 Prefetch operation	18
5.0 Reliability specifications	19
5.1 Error rates	19
5.1.1 Recoverable Errors	19
5.1.2 Unrecoverable Errors	19
5.1.3 Seek errors	20
5.1.4 Interface errors	20
5.2 Reliability and service	20
5.2.1 Annualized Failrue Rate (AFR) and Mean time between failure (MTBF)	20
5.2.2 Preventive maintenance	20
5.2.3 Hot plugging the drive	20
5.2.4 S.M.A.R.T.	21
5.2.5 Thermal monitor	22
5.2.6 Drive Self Test (DST)	23
5.2.6.1 DST failure definition	23
5.2.6.2 Implementation	23
5.2.6.2.1 State of the drive prior to testing	23
5.2.6.2.2 Invoking DST	24
5.2.6.2.3 Short and extended tests	24
5.2.6.2.4 Log page entries	24
5.2.6.2.5 Abort	25
5.2.7 Product warranty	25
6.0 Physical/electrical specifications	27
6.1 AC power requirements	27
6.2 DC power requirements	27
6.2.1 Conducted noise immunity	31
6.2.2 Power sequencing	31
6.2.3 Current profiles	31
6.3 Power dissipation	34
6.4 Environmental limits	40
6.4.1 Temperature	40
6.4.2 Relative humidity	41
6.4.3 Effective altitude (sea level)	41
6.4.4 Shock and vibration	41
6.4.4.1 Shock	41
6.4.4.2 Vibration	43
6.4.5 Acoustics	43
6.4.6 Air cleanliness	43
6.4.7 Corrosive environment	43
6.4.8 Electromagnetic susceptibility	44
6.5 Mechanical specifications	44
7.0 Defect and error management	47
7.1 Drive internal defects/errors	47
7.2 Drive error recovery procedures	47
7.3 SAS system errors	49
7.4 Background Media Scan	49
7.5 Media Pre-Scan	49
7.6 Deferred Auto-Reallocation	50
7.7 Idle Read After Write	50
8.0 Installation	51
8.1 Drive orientation	51
8.2 Cooling	51
8.3 Drive mounting	53
8.4 Grounding	53
9.0 Interface requirements	55
9.1 SAS features	55
9.1.1 task management functions	55
9.1.2 task management responses	55
9.2 Dual port support	56
9.3 SCSI commands supported	57
9.3.1 Inquiry data	61
9.3.2 Mode Sense data	62
9.3.2.1 ST3450856SS/ST3450056SS Mode Sense data	63
9.3.2.2 ST3300656SS/ST3300056SS Mode Sense data	64
9.3.2.3 ST3146356SS/ST3146756SS Mode Sense data	65
9.4 Miscellaneous operating features and conditions	66
9.4.1 SAS physical interface	66
9.4.2 Physical characteristics	69
9.4.3 Connector requirements	69
9.4.4 Electrical description	70
9.4.5 Pin descriptions	70
9.4.6 SAS transmitters and receivers	71
9.4.7 Power	71
9.5 Signal characteristics	71
9.5.1 Ready LED Out	71
9.5.2 Differential signals	72
9.5.2.1 Eye masks	72
9.5.2.1.1 Eye masks overview	72
9.5.2.1.2 Receive eye mask	73
9.5.2.1.3 Jitter tolerance masks	73
9.5.2.2 Transmitter signal characteristics	75
9.5.2.3 Receiver signal characteristics	76
9.5.2.3.1 Jitter	76
9.5.2.3.2 Receiver jitter tolerance	77
9.5.2.3.3 Compliant jitter test pattern (CJTPAT)	77
9.5.2.3.4 Impedance specifications	77
9.5.2.4 Electrical TxRx connections	78
9.5.2.4.1 Transmitter characteristics	78
9.5.2.5 Receiver characteristics	81
10.0 Seagate Technology support services	83
Numerics	85
A	85
B	85
C	85
D	85
E	85
F	86
G	86
H	86
I	86
J	86
L	86
M	86
N	86
O	87
P	87
Q	87
R	87
S	87
T	88
U	88
V	88
W	88