Seagate ST3146707LW/LC manual Scsi interface cable requirements, Cable requirements, LC Models

Page 78

Table 13: Interface transfer rates supported

 

 

Maximum transfer rate

 

 

 

 

 

Interface type/

 

 

 

 

 

 

 

 

 

 

Fast-20

Fast-40

Fast-80

Fast-160

drive models

Asynchronous

Fast-5

Fast-10

(Ultra)

(Ultra2)

(Ultra160)

(Ultra320)

 

 

 

 

 

 

 

 

 

SE

ST3300007LW/LC

yes

yes

yes

yes

no

no

no

 

ST3146707LW/LC

 

 

 

 

 

 

 

 

ST373207LW/LC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LVD

ST3300007LW/LC

yes

yes

yes

yes

yes

yes

yes

 

ST3146707LW/LC

 

 

 

 

 

 

 

 

ST373207LW/LC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9.6.3SCSI interface cable requirements

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

9.6.3.1Cable 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.

9.6.4Mating connectors

Part numbers for the different type connectors that mate with the various Cheetah 10K.7 SCSI I/O connectors are given in the sections following.

68

Cheetah 10K.7 SCSI Product Manual, Rev. D

Page 77 Page 79
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Contents Cheetah 10K.7 Scsi Page Cheetah 10K.7 Scsi Page Revision status summary sheet Page Contents Seagate Technology support services Defect and error managementInstallation Interface requirementsList of Figures Viii Cheetah 10K.7 Scsi Product Manual, Rev. D Scope Cheetah 10K.7 Scsi family drive ST3300007LC shownCheetah 10K.7 Scsi Product Manual, Rev. D Electromagnetic compatibility Applicable standards and reference documentationStandards Electromagnetic susceptibilityElectromagnetic compliance European Union Restriction of Hazardous Substances RoHSReference documents Cheetah 10K.7 Scsi Product Manual, Rev. D General description Standard features Media characteristicsPerformance ReliabilityFormatted capacities Accessories user installed Factory installed accessoriesOptions factory installed Programmable drive capacityPerformance characteristics Internal drive characteristics transparent to userScsi performance characteristics visible to user Generalized performance characteristics Access timeFormat command execution time minutes Ultra320 ScsiStart/stop time Prefetch/multi-segmented cache controlCache operation Caching write data Prefetch operation Cheetah 10K.7 Scsi Product Manual, Rev. D Recoverable Errors Reliability specificationsError rates Unrecoverable ErrorsPreventive maintenance Reliability and serviceSeek errors Annualized Failure Rate AFR4 S.M.A.R.T Controlling S.M.A.R.TDetermining rate Performance impactReporting control Predictive failuresParameter Code Description Drive Self Test DSTImplementation State of the drive prior to testingDST Failure Definition Invoking DSTExtended test Function Code 010b Product warrantyShort test Function Code 001b Log page entriesShipping Product repair and return informationPhysical/electrical specifications AC power requirementsDC power requirements ST3146707 SE mode LVD mode Power sequencing Conducted noise immunity3 12 V Current profile Typical ST3300007 drive +12 V current profile Typical ST3146707 drive +12 V current profile Typical ST373207 drive +12 V current profile Power dissipation ST3300007ST3146707 ST373207 Relative humidity TemperatureEnvironmental limits Effective altitude sea levelShock and vibration ShockRecommended mounting Air cleanliness VibrationCorrosive environment Mechanical specifications AcousticsLW mounting configuration dimensions LC mounting configuration dimensions Defect and error management Drive error recovery proceduresDrive internal defects Page Scsi systems errors Background Media Scan Media Pre-ScanDrive ID/option select header InstallationConfigure drive options FormattingJ6 jumper header J5 jumper header on LW models only J2 option select header on LW models only Function description RESDrive orientation CoolingDrive mounting GroundingCheetah 10K.7 Scsi Product Manual, Rev. D Interface requirements General descriptionScsi interface messages supported Scsi interface commands supported Page Page Page Inquiry Vital Product data Mode Sense data Mode Sense 10 Byte Header Data 00 ae 00 10 00 00 00 08 11 17 73 30 00 00 02 00 ae 00 10 00 00 00 08 08 8b b9 98 00 00 02 Scsi bus conditions and miscellaneous features supported Condition/feature supported bySynchronous data transfer periods supported Synchronous data transferPhysical interface 2 REQ/ACK offsetDC cable and connector PCB Scsi interface physical description Cable requirements Mating connectorsScsi interface cable requirements LC ModelsMating connectors for LW model drives Mating connectors for LC model drivesRight-angle to Pcba connectors Scsi daisy chain interface cabling for LW drives Nonshielded 68-pin Scsi device connector used on LW drives Nonshielded 80-pin Scsi SCA-2 connector, used on LC drives GND +DBP1 Charge Active LED OUT 4 REQ +REQ Active LED OUT 4 LVD output characteristics Electrical descriptionMultimode-SE and LVD alternatives LVD input characteristics General cable characteristicsSingle-ended drivers/receivers Cables for low voltage differential drivers/receivers Terminator requirements Terminator power LW drivesLC drives Disc drive Scsi timing Disc drive Scsi timing Spindle status Command status LED status Drive activity LEDPresales Support Seagate Technology support servicesInternet MySeagate Reseller.seagate.com Technical SupportWarranty Service Data Recovery Services Authorized Service CentersData Recovery Services FAX services-All Europe toll call Call center Presales and Technical Support Warranty ServiceToll-free support numbers Asia/Pacific support services Publication feedback survey Cheetah 10K.7 Scsi Product Manual, Rev. D Symbols NumericsPage Page PCB Page Cheetah 10K.7 Scsi Product Manual, Rev. D

ST3300007LW/LC, ST373207LW/LC, ST3146707LW/LC specifications

Seagate's ST3146707LW/LC, ST373207LW/LC, and ST3300007LW/LC are part of the company's renowned line of hard disk drives (HDDs), specifically designed for enterprise and high-performance computing environments. With their reliability and performance, these drives have become popular choices for data centers and critical applications requiring extensive storage capabilities.

One of the standout features of these models is their capacity to handle large volumes of data. The ST3146707LW/LC has a capacity of 146GB, while the ST373207LW/LC offers 73GB, and the ST3300007LW/LC comes with a substantial 300GB. These capacities make them well-suited for applications that require not only high storage space but also rapid access to data.

In terms of performance, these drives utilize a 10,000 RPM spindle speed, which significantly enhances data access times and overall performance. The combination of fast rotational speeds with Seagate's advanced caching algorithms allows for swift data retrieval, making these drives ideal for environments where speed is crucial.

These HDDs also employ the SCSI (Small Computer System Interface) interface, which promises high data transfer rates and reliability in enterprise-level applications. The Ultra320 SCSI interface can support transfer rates up to 320 MB/s, ensuring that the drives can efficiently communicate with other system components.

Another key technology featured in these models is Seagate's Adaptive Error Correction technology, which enhances data integrity and reliability. This feature helps in the detection and correction of errors that can occur during data transfer, reducing the risk of data loss.

Performance consistency is critical in enterprise environments, and these drives are built to endure the demands of 24/7 operation. They are designed with robust mechanisms to withstand temperature fluctuations, shock, and vibrations commonly found in data center settings.

In summary, the Seagate ST3146707LW/LC, ST373207LW/LC, and ST3300007LW/LC hard drives exemplify advanced features and technologies tailored for enterprise storage solutions. With significant capacities, impressive spindle speeds, SCSI connectivity, and reliability-focused technologies, these drives remain a valuable asset for businesses relying on stable and high-performance data storage.
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