Seagate ST3300007LW/LC, ST3146707LW/LC LVD input characteristics, General cable characteristics

Page 91

LVD input characteristics

Each differential signal received by LVD interface receiver circuits shall have the following input characteristics when measured at the disc drive connector:

Steady state Low level input differential voltage = 0.030 V = < Vin = < 3.6 V (signal negation/logic 0) Steady state High level input differential voltage = –3.6 V = < Vin = < –0.030 V (signal assertion/logic 1) Differential voltage = +0.030 V minimum with common-mode voltage range 0.845 V = < Vcm = < 1.655 V. (T10/1302D revision 14, section A.3.2).

 

VCCA

 

VCCB

Single

LVD Signal Drivers

Single

Single

 

Ended

 

Ended

Ended

Circuitry

 

Receiver

Negation

 

LVD

 

Driver

 

 

 

 

Receiver

 

 

Single

 

 

Single

Ended

 

 

Ended

Ground

 

 

Assertion

Driver

 

 

Driver

 

LVD Signal Drivers

 

 

Ground

 

 

 

Single Ended:

GND

—Signal

LVD:

+Signal

—Signal

Figure 27. Typical SE-LVD alternative transmitter receiver circuits

9.7.1.1General cable characteristics

To minimize discontinuities 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, the number of loads, 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 SCSI transfer rates.

9.7.1.2Single-ended drivers/receivers

The maximum total cable length allowed with drives using single-ended I/O driver and receiver circuits depends on several factors. Table 18 lists the maximum lengths allowed for different configurations of drive usage. These values are from the SPI documents. All device I/O lines must have equal to or less than 25 pf capacitance to ground, measured at the beginning of the stub.

Table 18: Cable characteristics for single-ended circuits

 

 

maximum length

Transmission line impedance

 

Maximum number of

between SCSI S.E.

 

 

 

 

 

I/O transfer rate

devices on the bus

terminators

REQ/ACK

Other signals

 

 

 

 

 

<10M transfers/s (Fast 10)

16 (wide SCSI bus)

3 meters (9.8 ft)

90 + 6 Ohms

90 + 10 Ohms

 

 

 

 

 

<20M transfers/s (Fast 20)

4 (wide SCSI bus)

3 meters (9.8 ft)

90 + 6 Ohms

90 + 10 Ohms

 

 

 

 

 

<20M transfers/s (Fast 20)

8 (wide SCSI bus)

1.5 meters (4.9 ft)

90 + 6 Ohms

90 + 10 Ohms

 

 

 

 

 

A stub length of no more than 0.1 meter (0.33 ft) is allowed off the mainline interconnection with any connected equipment. The stub length is measured from the transceiver to the connection to the mainline SCSI bus.

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

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Contents Cheetah 10K.7 Scsi Page Cheetah 10K.7 Scsi Page Revision status summary sheet Page Contents Interface requirements Defect and error managementInstallation Seagate Technology support servicesList of Figures Viii Cheetah 10K.7 Scsi Product Manual, Rev. D Cheetah 10K.7 Scsi family drive ST3300007LC shown ScopeCheetah 10K.7 Scsi Product Manual, Rev. D Electromagnetic susceptibility Applicable standards and reference documentationStandards Electromagnetic compatibilityEuropean Union Restriction of Hazardous Substances RoHS Electromagnetic complianceReference documents Cheetah 10K.7 Scsi Product Manual, Rev. D General description Media characteristics Standard featuresReliability PerformanceFormatted capacities Programmable drive capacity Factory installed accessoriesOptions factory installed Accessories user installedInternal drive characteristics transparent to user Performance characteristicsScsi performance characteristics visible to user Ultra320 Scsi Access timeFormat command execution time minutes Generalized performance characteristicsPrefetch/multi-segmented cache control Start/stop timeCache operation Caching write data Prefetch operation Cheetah 10K.7 Scsi Product Manual, Rev. D Unrecoverable Errors Reliability specificationsError rates Recoverable ErrorsAnnualized Failure Rate AFR Reliability and serviceSeek errors Preventive maintenanceControlling S.M.A.R.T 4 S.M.A.R.TPredictive failures Performance impactReporting control Determining rateDrive Self Test DST Parameter Code DescriptionInvoking DST State of the drive prior to testingDST Failure Definition ImplementationLog page entries Product warrantyShort test Function Code 001b Extended test Function Code 010bProduct repair and return information ShippingAC power requirements Physical/electrical specificationsDC power requirements ST3146707 SE mode LVD mode Conducted noise immunity Power sequencing3 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 ST3300007 Power dissipationST3146707 ST373207 Effective altitude sea level TemperatureEnvironmental limits Relative humidityShock Shock and vibrationRecommended mounting Vibration Air cleanlinessCorrosive environment Acoustics Mechanical specificationsLW mounting configuration dimensions LC mounting configuration dimensions Drive error recovery procedures Defect and error managementDrive internal defects Page Scsi systems errors Media Pre-Scan Background Media ScanFormatting InstallationConfigure drive options Drive ID/option select headerJ6 jumper header J5 jumper header on LW models only J2 option select header on LW models only RES Function descriptionCooling Drive orientationGrounding Drive mountingCheetah 10K.7 Scsi Product Manual, Rev. D General description Interface requirementsScsi 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 Condition/feature supported by Scsi bus conditions and miscellaneous features supported2 REQ/ACK offset Synchronous data transferPhysical interface Synchronous data transfer periods supportedDC cable and connector PCB Scsi interface physical description LC Models Mating connectorsScsi interface cable requirements Cable requirementsMating connectors for LC model drives Mating connectors for LW 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 Electrical description LVD output characteristicsMultimode-SE and LVD alternatives General cable characteristics LVD input characteristicsSingle-ended drivers/receivers Cables for low voltage differential drivers/receivers LW drives Terminator requirements Terminator powerLC drives Disc drive Scsi timing Disc drive Scsi timing Drive activity LED Spindle status Command status LED statusTechnical Support Seagate Technology support servicesInternet MySeagate Reseller.seagate.com Presales SupportData Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call center Presales and Technical Support Warranty Service FAX services-All Europe toll callToll-free support numbers Asia/Pacific support services Publication feedback survey Cheetah 10K.7 Scsi Product Manual, Rev. D Numerics SymbolsPage 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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