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Physical/electrical specifications

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Barracuda 36ES2 Product Manual, Rev. B 21 6.0 Physical/electrical specifications This section provides information relating to the physical and electrical characteristics of the Barracuda 36ES2 drive. 6.1 AC power requirements None. 6.2 DC power requirements The voltage and current requirements for a single drive are shown in the following table. Values indicated apply at the drive power connector. The table shows current values in Amperes. Table 2: DC power requirements ST336938 ST336918 ST336938 ST318438 ST318418 ST318438 Notes SE mode LVD mode SE mode LVD mode Voltage Regulation [5] Average idle current DCX [1][7] Maximum starting current (peak DC) DC [1][3] Delayed motor start (max) DC [1] [4] Peak operating current DCX Maximum DC Maximum (peak) [1] [6] [1] +5 V ±5% 0.77 +12 V ±5% [2] 0.31 +5 V ±5% 0.77 +12 V ±5% [2] 0.31 +5 V ±5% 0.78 +12 V ±5% [2] 0.31 +5 V ±5% 0.78 +12 V ±5% [2] 0.31 0.84 2.02 0.86 2.02 0.83 2.05 0.82 2.05 0.66 0.03 0.66 0.03 0.63 0.03 0.63 0.03 1.11 0.72 1.11 0.72 1.15 0.65 1.16 0.65 1.14 0.73 1.14 0.73 1.17 0.66 1.17 0.66 1.78 1.74 1.78 1.74 1.80 1.76 1.78 1.76 [1] Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous current peaks will exceed these values. Power supply at nominal voltage. Number of units tested = 6 at ambient. [2] For +12 V, a -10% tolerance is permissible during initial start of spindle, and must return to ±5% before 7,200 rpm is reached. The ±5% must be maintained after the drive signifies that its power-up sequence has been completed and that the drive is able to accept selection by the host initiator. [3] See +12 V current profile in Figure 2. [4] This condition occurs when the Motor Start Option is enabled and the drive has not yet received a Start Motor command. [5] See Section 6.2.1 "Conducted Noise Immunity." Specified voltage tolerance is inclusive of ripple, noise, and transient response. [6] Operating condition is defined as 8 random block reads at 133 I/Os per second. Current and power specified at nominal voltages. Decreasing +5 volts by 5% increases +5 volt current by 4%. [7] During idle, the drive heads are relocated every 60 seconds to a random location within the band from track zero to one-fourth of maximum track. General Notes from Table 2: 1. Minimum current loading for each supply voltage is not less than 1.5% of the maximum operating current shown. 2. The +5 and +12 volt supplies shall employ separate ground returns. 3. Where power is provided to multiple drives from a common supply, careful consideration for individual drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak starting current must be available to each device. 4. Parameters, other than spindle start, are measured after a 10-minute warm up. 5. No terminator power.

Section	Page
1.0 Scope 1	7
2.0 Applicable standards and reference documentation 3	7
2.1 Standards 3	7
2.1.1 Electromagnetic compatibility 3	7
2.1.2 Electromagnetic susceptibility 3	7
2.2 Electromagnetic compliance 3	7
2.3 Reference documents 4	7
3.0 General description 5	7
3.1 Standard features 6	7
3.2 Media characteristics 6	7
3.3 Performance 6	7
3.4 Reliability 6	7
3.5 Unformatted and formatted capacities 7	7
3.6 Programmable drive capacity 7	7
3.7 Factory installed accessories 7	7
3.8 Options (factory installed) 7	7
4.0 Performance characteristics 8	7
4.1 Internal drive characteristics (transparent to user) 8	7
4.2 SCSI performance characteristics (visible to user) 8	7
4.2.1 Access time 8	7
4.2.2 Format command execution time (minutes) 8	7
4.2.3 Generalized performance characteristics 8	7
4.3 Start/stop time 9	7
4.4 Prefetch/multi-segmented cache control 9	7
4.5 Cache operation 10	7
4.5.1 Caching write data 10	7
4.5.2 Prefetch operation 11	7
5.0 Reliability specifications 13	7
5.1 Error rates 13	7
5.1.1 Environmental interference 13	7
5.1.2 Read errors 13	7
5.1.3 Write errors 13	7
5.1.4 Seek errors 13	7
5.2 Reliability and service 14	7
5.2.1 Mean time between failure 14	7
5.2.2 Preventive maintenance 14	7
5.2.3 Service life 14	7
5.2.4 Service philosophy 14	7
5.2.5 Service tools 14	7
5.2.6 Hot plugging Barracuda 36ES2 disc drives 15	7
5.2.7 S.M.A.R.T. 15	7
5.2.8 Drive Self Test (DST) 16	7
5.2.8.1 DST Failure Definition 17	7
5.2.8.2 Implementation 17	7
5.2.9 Product warranty 18	7
6.0 Physical/electrical specifications 21	7
6.1 AC power requirements 21	7
6.2 DC power requirements 21	7
6.2.1 Conducted noise immunity 22	7
6.2.2 Power sequencing 22	7
6.2.3 12 V - Current profile 22	7
6.3 Power dissipation 24	7
6.4 Environmental limits 26	7
6.4.1 Temperature 26	8
6.4.2 Relative humidity 27	8
6.4.3 Effective altitude (sea level) 27	8
6.4.4 Shock and vibration 27	8
6.4.4.1 Shock 27	8
6.4.4.2 Vibration 29	8
6.4.5 Air cleanliness 29	8
6.4.6 Acoustics 29	8
6.4.7 Electromagnetic susceptibility 29	8
6.5 Mechanical specifications 30	8
7.0 Defect and error management 33	8
7.1 Drive internal defects 33	8
7.2 Drive error recovery procedures 33	8
7.3 SCSI systems errors 34	8
8.0 Installation 35	8
8.1 Drive ID/option select header 35	8
8.1.1 Notes for Figures 14 through 18 40	8
8.1.2 Function description 41	8
8.1.3 Drive orientation 42	8
8.2 Cooling 42	8
8.2.1 Air flow 42	8
8.3 Drive mounting 43	8
8.4 Grounding 43	8
9.0 Interface requirements 45	8
9.1 General description 45	8
9.2 SCSI interface messages supported 45	8
9.3 SCSI interface commands supported 46	8
9.3.1 Inquiry Vital Product data 50	8
9.3.2 Mode Sense data 52	8
9.4 SCSI bus conditions and miscellaneous features supported 55	8
9.5 Synchronous data transfer 57	8
9.5.1 Synchronous data transfer periods supported 57	8
9.5.2 REQ/ACK offset 57	8
9.6 Physical interface 57	8
9.6.1 DC cable and connector 57	8
9.6.2 SCSI interface physical description 60	8
9.6.3 SCSI interface cable requirements 60	8
9.6.4 Mating connectors 61	8
9.6.4.1 Mating connectors for N model drives 61	8
9.6.4.2 Mating connectors for LW model drives 63	8
9.7 Electrical description 68	8
9.7.1 Multimode—SE and LVD alternatives 68	8
9.7.1.1 Single-ended drivers/receivers for N models 70	8
9.7.1.2 Single-ended drivers/receivers for LW models 70	8
9.7.1.3 Low voltage differential I/O circuits 71	8
9.7.1.4 General cable characteristics 71	8
9.8 Terminator requirements 72	8
9.9 Terminator power 72	8
9.10 Disc drive SCSI timing 73	8
9.11 Drive activity LED 74	8
10.0 Seagate Technology support services 75	8
Figure 1. Barracuda 36ES2 family drive (ST336938LW shown) 1	9
Figure 2. Typical ST336938/ST336918/ST318438/ST318418 drive +12 V current profile 22	9
Figure 3. Typical ST336938/ST336918/ST318438/ST318418 drive +5 V current profile 23	9
Figure 4. ST336938/ST318438 DC current and power vs. input/output operations per second (LVD) 24	9
Figure 5. ST336918/ST318418 DC current and power vs. input/output operations per second (SE) 25	9
Figure 6. Location of HDA Temperature Check Point 26	9
Figure 7. Recommended mounting 28	9
Figure 8. LW mounting configuration dimensions 30	9
Figure 9. N mounting configuration dimensions 31	9
Figure 10. J6 jumper header for LW models 36	9
Figure 11. J6 jumper header for N model 37	9
Figure 12. J5 jumper header (on LW models only) 38	9
Figure 13. J2 option select header (for LW models) 39	9
Figure 14. J2 option select header (for N models) 39	9
Figure 15. Air flow (suggested) 42	9
Figure 16. N model drive physical interface (50-pin SCSI I/O connector) 58	9
Figure 17. LW model drive physical interface (68-pin J1 SCSI I/O connector) 59	9
Figure 18. Nonshielded 50-pin SCSI device connector used on N drives 61	9
Figure 19. SCSI daisy chain interface cabling for N drives 62	9
Figure 20. Nonshielded 68 pin SCSI device connector used on LW drives 63	9
Figure 21. SCSI daisy chain interface cabling for LW drives 64	9
Figure 22. LVD output signals 69	9
Figure 23. Typical SE-LVD alternative transmitter receiver circuits 69	9
Figure 24. Single-ended transmitters and receivers on N models 70	9
1.0 Scope	11
2.0 Applicable standards and reference documentation	13
2.1 Standards	13
2.1.1 Electromagnetic compatibility	13
2.1.2 Electromagnetic susceptibility	13
2.2 Electromagnetic compliance	13
2.3 Reference documents	14
3.0 General description	15
3.1 Standard features	16
3.2 Media characteristics	16
3.3 Performance	16
3.4 Reliability	16
3.5 Unformatted and formatted capacities	17
3.6 Programmable drive capacity	17
3.7 Factory installed accessories	17
3.8 Options (factory installed)	17
4.0 Performance characteristics	18
4.1 Internal drive characteristics (transparent to user)	18
4.2 SCSI performance characteristics (visible to user)	18
4.2.1 Access time [5]	18
4.2.2 Format command execution time (minutes) [1]	18
4.2.3 Generalized performance characteristics	18
4.3 Start/stop time	19
4.4 Prefetch/multi-segmented cache control	19
4.5 Cache operation	20
4.5.1 Caching write data	20
4.5.2 Prefetch operation	21
5.0 Reliability specifications	23
5.1 Error rates	23
5.1.1 Environmental interference	23
5.1.2 Read errors	23
5.1.3 Write errors	23
5.1.4 Seek errors	23
5.2 Reliability and service	24
5.2.1 Mean time between failure	24
5.2.2 Preventive maintenance	24
5.2.3 Service life	24
5.2.4 Service philosophy	24
5.2.5 Service tools	24
5.2.6 Hot plugging Barracuda 36ES2 disc drives	25
5.2.7 S.M.A.R.T.	25
5.2.8 Drive Self Test (DST)	26
5.2.8.1 DST Failure Definition	27
5.2.8.2 Implementation	27
5.2.8.2.1 State of the drive prior to testing	27
5.2.8.2.2 Invoking DST	27
5.2.8.2.3 Short and extended tests	27
5.2.8.2.4 Log page entries	28
5.2.8.2.5 Abort	28
5.2.9 Product warranty	28
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	34
6.4 Environmental limits	36
6.4.1 Temperature	36
6.4.2 Relative humidity	37
6.4.3 Effective altitude (sea level)	37
6.4.4 Shock and vibration	37
6.4.4.1 Shock	37
6.4.4.2 Vibration	39
6.4.5 Air cleanliness	39
6.4.6 Acoustics	39
6.4.7 Electromagnetic susceptibility	39
6.5 Mechanical specifications	40
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 ID/option select header	45
8.1.1 Notes for Figures 14 through 18	50
8.1.2 Function description	51
8.1.3 Drive orientation	52
8.2 Cooling	52
8.2.1 Air flow	52
8.3 Drive mounting	53
8.4 Grounding	53
9.0 Interface requirements	55
9.1 General description	55
9.2 SCSI interface messages supported	55
9.3 SCSI interface commands supported	56
9.3.1 Inquiry Vital Product data	60
9.3.2 Mode Sense data	62
9.4 SCSI bus conditions and miscellaneous features supported	65
9.5 Synchronous data transfer	67
9.5.1 Synchronous data transfer periods supported	67
9.5.2 REQ/ACK offset	67
9.6 Physical interface	67
9.6.1 DC cable and connector	67
9.6.2 SCSI interface physical description	70
9.6.3 SCSI interface cable requirements	70
9.6.4 Mating connectors	71
9.6.4.1 Mating connectors for N model drives	71
9.6.4.2 Mating connectors for LW model drives	73
9.7 Electrical description	78
9.7.1 Multimode—SE and LVD alternatives	78
9.7.1.1 Single-ended drivers/receivers for N models	80
9.7.1.2 Single-ended drivers/receivers for LW models	80
9.7.1.3 Low voltage differential I/O circuits	81
9.7.1.4 General cable characteristics	81
9.8 Terminator requirements	82
9.9 Terminator power	82
9.10 Disc drive SCSI timing	83
9.11 Drive activity LED	84
10.0 Seagate Technology support services	85
Symbols	89
Numerics	89
A	89
B	89
C	89
D	89
E	90
F	90
G	90
H	90
I	91
J	91
K	91
L	91
M	91
N	91
O	91
P	92
R	92
S	92
T	93
U	93
V	93
W	93
X	94

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Barracuda 36ES2 Product Manual, Rev. B

6.0

Physical/electrical specifications

This section provides information relating to the physical and electrical characteristics of the Barracuda 36ES2

drive.

6.1

AC power requirements

None.

6.2

DC power requirements

The voltage and current requirements for a single drive are shown in the following table. Values indicated apply

at the drive power connector. The table shows current values in Amperes.

Table 2:

DC power requirements

[1]

Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous current peaks

will exceed these values. Power supply at nominal voltage. Number of units tested = 6 at ambient.

[2]

For +12 V, a –10% tolerance is permissible during initial start of spindle, and must return to ±5% before

7,200 rpm is reached. The ±5% must be maintained after the drive signifies that its power-up sequence

has been completed and that the drive is able to accept selection by the host initiator.

[3]

See +12 V current profile in Figure 2.

[4]

This condition occurs when the Motor Start Option is enabled and the drive has not yet received a Start

Motor command.

[5]

See Section 6.2.1 “Conducted Noise Immunity.” Specified voltage tolerance is inclusive of ripple, noise,

and transient response.

[6]

Operating condition is defined as 8

random block reads at 133 I/Os per second. Current and power spec-

ified at nominal voltages. Decreasing +5 volts by 5% increases +5 volt current by 4%.

[7]

During idle, the drive heads are relocated every 60 seconds to a random location within the band from

track zero to one-fourth of maximum track.

General Notes from Table 2:

Minimum current loading for each supply voltage is not less than 1.5% of the maximum operating current

shown.

The +5 and +12 volt supplies shall employ separate ground returns.

Where power is provided to multiple drives from a common supply, careful consideration for individual

drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak

starting current must be available to each device.

Parameters, other than spindle start, are measured after a 10-minute warm up.

No terminator power.

Notes

ST336938

ST336918

ST336938

ST318438

ST318418

ST318438

SE mode

LVD mode

SE mode

LVD mode

Voltage

+5 V

+12 V

+5 V

+12 V

+5 V

+12 V

+5 V

+12 V

Regulation

[5]

±5%

±5%[2]

±5%

±5%[2]

±5%

±5%[2]

±5%

±5%[2]

Average idle current DCX

[1][7]

0.77

0.31

0.77

0.31

0.78

0.31

0.78

0.31

Maximum starting current

(peak DC) DC

[1][3]

0.84

2.02

0.86

2.02

0.83

2.05

0.82

2.05

Delayed motor start

(max) DC

[1][4]

0.66

0.03

0.66

0.03

0.63

0.03

0.63

0.03

Peak operating current

DCX

Maximum DC

Maximum (peak)

[1][6]

[1]

1.11

1.14

1.78

0.72

0.73

1.74

1.11

1.14

1.78

0.72

0.73

1.74

1.15

1.17

1.80

0.65

0.66

1.76

1.16

1.17

1.78

0.65

0.66

1.76