Seagate ST3300457FC Cheetah 15K.5 SCSI Product Manual - Page 65

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

59

Table 16 shows the interface transfer rates supported by the various drive models defined in this manual.

10.6.3

SCSI interface cable requirements

The characteristics of cables used to connect parallel interface drives are discussed in the ANSI standards ref-

erenced in this section.

10.6.3.1

Cable requirements

The characteristics of cables used to connect Ultra320 SCSI parallel interface devices are discussed in detail

in Section 6 of ANSI Standard T10/1365D Rev. 3. The cable characteristics that must be considered when

interconnecting the drives described in this manual in a Ultra320 SCSI parallel, daisy-chain interconnected

system are:

•

characteristic impedance (see T10/1365D Sections 6.3.3 and 6.3.4)

•

propagation delay (see T10/1365D Sections 6.3.6 and 6.3.7)

•

stub length (see T10/1365D Section 6.9)

•

device spacing (see T10/1365D Section 6.9)

To minimize discontinuances and signal reflections, cables of different impedances should not be used in the

same bus. Implementations may require trade-offs in shielding effectiveness, cable length, number of loads

and spacing, transfer rates, and cost to achieve satisfactory system operation. If shielded and unshielded

cables are mixed within the same SCSI bus, the effect of impedance mismatch must be carefully considered.

Proper impedance matching is especially important in order to maintain adequate margin at FAST-20, FAST-

40, FAST-80, and FAST-160 SCSI transfer rates.

Note.

For LVD operation, twisted pair cables are recommended. For LVD Fast-40 operation, twisted pair

cables are

strongly

recommended. For Fast-80 and Fast-160 operation, twisted pair cables are

required

.

LC Models

The 80-pin connector option provided on LC models is intended for use on drives that plug directly into back-

plane connector in the host equipment. In such installations, all backplane wiring segments are subject to the

electromagnetic concepts presented in Standard T10/1365D, Rev. 3, Section 6. For LC model drives, installa-

tions with connectors on cables are not recommended.

10.6.4

Mating connectors

Part numbers for the different type connectors that mate with the various Cheetah 15K.5 SCSI I/O connectors

are given in the sections following.

Table 16:

Interface transfer rates supported

Interface type/

drive models

Maximum transfer rate

Asynchronous

Fast-5

Fast-10

Fast-20

(Ultra)

Fast-40

(Ultra2)

Fast-80

(Ultra160)

Fast-160

(Ultra320)

SE

ST3300655LW/LC

ST3146855LW/LC

ST373455LW/LC

yes

yes

yes

yes

no

no

no

LVD

ST3300655LW/LC

ST3146855LW/LC

ST373455LW/LC

yes

yes

yes

yes

yes

yes

yes

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

Seagate ST3300457FC Cheetah 15K.5 SCSI Product Manual - Page 65

SCSI interface cable requirements, 6.3.1, Cable requirements, LC Models, Mating connectors, Table 16

Page 65 highlights