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Synchronous data transfer periods supported, Table 14, Synchronous DT DATA transfer periods, Table

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10.5 Synchronous data transfer The data transfer period to be used by the drive and the initiator is established by an exchange of messages during the Message Phase of operation. See the section on message protocol in the Parallel SCSI Interface Manual and SCSI Commands Reference Manual. 10.5.1 Synchronous data transfer periods supported In the following tables, M is the synchronous period value (in the transfer rate negotiation message) that represents the associated transfer period and transfer rate values. Table 14 lists the synchronous data transfer periods supported by the drive in DT DATA phase. DT DATA phase is only allowed when using the LVD interface. Table 14: Synchronous DT DATA transfer periods M (decimal) Transfer period Transfer rate (nanoseconds) (megatransfers/second) 8 6.25 160.0 9 12.5 80.0 10 25 40.0 12 50 20.0 25 100 10.0 Transfer rate (MBytes/second) on wide bus 320.0 160.0 80.0 40.0 20.0 Table 15 lists the synchronous data transfer periods supported by the drive in ST DATA phase. ST DATA phase is allowed with either LVD or SE interface except as noted. Table 15: Synchronous ST DATA transfer periods M (decimal) Transfer period Transfer rate (nanoseconds) (megatransfers/second) 10 25 40.01 12 50 20.0 25 100 10.0 50 200 5.0 1. This transfer rate is only allowed when using the LVD interface. 10.5.2 REQ/ACK offset Cheetah 15K.5 SCSI family drives support REQ/ACK offset values from 7 to 63 (3Fh). Offsets of 1 through 6 are negotiated to 0 (asynchronous transfer). 10.6 Physical interface This section describes the connectors, cables, signals, terminators and bus timing of the DC and SCSI I/O interface. See Section 10.8 and Section 10.9 for additional terminator information. Figures 13 and 14 show the locations of the DC power connector, SCSI interface connector, drive select headers, and option select headers. Details of the physical, electrical and logical characteristics are given in sections following, while the SCSI operational aspects of Seagate drive interfaces are given in the Parallel SCSI Interface Manual. 56 Cheetah 15K.5 SCSI Product Manual, Rev. J

Section	Page
1.0 Seagate Technology support services	7
2.0 Scope	8
3.0 Applicable standards and reference documentation	9
3.1 Standards	9
3.1.1 Electromagnetic compatibility	9
3.1.2 Electromagnetic susceptibility	9
3.2 Electromagnetic compliance	10
3.3 European Union Restriction of Hazardous Substances (RoHS)	10
3.4 Reference documents	11
4.0 General description	12
4.1 Standard features	13
4.2 Media characteristics	13
4.3 Performance	14
4.4 Reliability	14
4.5 Formatted capacities	14
4.5.1 Programmable drive capacity	15
4.6 Factory installed accessories	15
4.7 Options (factory installed)	15
4.8 Accessories	15
5.0 Performance characteristics	16
5.1 Internal drive characteristics (transparent to user)	16
5.2 SCSI performance characteristics (visible to user)	16
5.2.1 Seek time	17
5.2.2 Format command execution time (minutes) [1]	17
5.2.3 Generalized performance characteristics	17
5.3 Start/stop time	18
5.4 Prefetch/multi-segmented cache control	18
5.5 Cache operation	18
5.5.1 Caching write data	19
5.5.2 Prefetch operation	19
6.0 Reliability specifications	20
6.1 Error rates	20
6.1.1 Recoverable Errors	20
6.1.2 Unrecoverable Error	20
6.1.3 Seek errors	21
6.2 Reliability and service	21
6.2.1 Annualized Failure Rate (AFR) and Mean Time Between Failures (MTBF)	21
6.2.2 Preventive maintenance	21
6.2.3 Hot plugging Cheetah 15K.5 SCSI disc drives	22
6.2.4 S.M.A.R.T.	22
6.2.5 Thermal monitor	24
6.2.6 Drive Self Test (DST)	24
6.2.6.1 DST Failure Definition	25
6.2.6.2 Implementation	25
6.2.7 Product warranty	26
7.0 Physical/electrical specifications	28
7.1 AC power requirements	28
7.2 DC power requirements	28
7.2.1 Conducted noise immunity	30
7.2.2 Power sequencing	30
7.2.3 Current profile	30
7.3 Power dissipation	32
7.4 Environmental limits	35
7.4.1 Temperature	35
7.4.2 Relative humidity	35
7.4.3 Effective altitude (sea level)	35
7.4.4 Shock and vibration	36
7.4.4.1 Shock	36
7.4.4.2 Vibration	38
7.4.5 Air cleanliness	38
7.4.6 Corrosive environment	38
7.4.7 Acoustics	39
7.4.8 Electromagnetic susceptibility	39
7.5 Mechanical specifications	39
8.0 Defect and error management	41
8.1 Drive internal defects	41
8.2 Drive error recovery procedures	41
8.3 SCSI systems errors	43
8.4 Background Media Scan	43
8.5 Media Pre-Scan	43
8.6 Deferred Auto-Reallocation	44
8.7 Idle Read After Write	44
9.0 Installation	45
9.1 Drive ID/option select header	45
9.1.1 Notes for Figures 10 and 11.	47
9.1.2 Function description	48
9.2 Drive orientation	49
9.3 Cooling	49
9.4 Drive mounting	50
9.5 Grounding	50
10.0 Interface requirements	51
10.1 General description	51
10.2 SCSI interface messages supported	51
10.3 SCSI interface commands supported	52
10.3.1 Inquiry Vital Product data	56
10.3.2 Mode Sense data	57
10.4 SCSI bus conditions and miscellaneous features supported	61
10.5 Synchronous data transfer	62
10.5.1 Synchronous data transfer periods supported	62
10.5.2 REQ/ACK offset	62
10.6 Physical interface	62
10.6.1 DC cable and connector	63
10.6.2 SCSI interface physical description	64
10.6.3 SCSI interface cable requirements	65
10.6.3.1 Cable requirements	65
10.6.4 Mating connectors	65
10.6.4.1 Mating connectors for LW model drives	66
10.6.4.2 Mating connectors for LC model drives	66
10.7 Electrical description	74
10.7.1 Multimode—SE and LVD alternatives	74
10.7.1.1 General cable characteristics	75
10.7.1.2 Single-ended drivers/receivers	75
10.7.1.3 Cables for low voltage differential drivers/receivers	76
10.8 Terminator requirements	77
10.9 Terminator power	77
10.10 Disc drive SCSI timing	78
10.11 Drive activity LED	80

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Cheetah 15K.5 SCSI Product Manual, Rev. J

10.5

Synchronous data transfer

The data transfer period to be used by the drive and the initiator is established by an exchange of messages

during the Message Phase of operation. See the section on message protocol in the

Parallel SCSI Interface

Manual

and

SCSI Commands Reference Manual

10.5.1

Synchronous data transfer periods supported

In the following tables, M is the synchronous period value (in the transfer rate negotiation message) that repre-

sents the associated transfer period and transfer rate values.

Table 14 lists the synchronous data transfer periods supported by the drive in DT DATA phase. DT DATA

phase is only allowed when using the LVD interface.

Table 14:

Synchronous DT DATA transfer periods

Table 15 lists the synchronous data transfer periods supported by the drive in ST DATA phase. ST DATA phase

is allowed with either LVD or SE interface except as noted.

Table 15:

Synchronous ST DATA transfer periods

10.5.2

REQ/ACK offset

Cheetah 15K.5 SCSI family drives support REQ/ACK offset values from 7 to 63 (3Fh). Offsets of 1 through 6

are negotiated to 0 (asynchronous transfer).

10.6

Physical interface

This section describes the connectors, cables, signals, terminators and bus timing of the DC and SCSI I/O

interface. See Section 10.8 and Section 10.9 for additional terminator information.

Figures 13 and 14 show the locations of the DC power connector, SCSI interface connector, drive select head-

ers, and option select headers.

Details of the physical, electrical and logical characteristics are given in sections following, while the SCSI

operational aspects of Seagate drive interfaces are given in the

Parallel SCSI Interface Manual

M (decimal)

Transfer period

(nanoseconds)

Transfer rate

(megatransfers/second)

Transfer rate

(MBytes/second) on wide bus

6.25

160.0

320.0

12.5

80.0

160.0

40.0

80.0

20.0

40.0

100

10.0

20.0

M (decimal)

Transfer period

(nanoseconds)

Transfer rate

(megatransfers/second)

40.0

This transfer rate is only allowed when using the LVD interface.

20.0

100

10.0

200

5.0