Seagate ST973402SS Signal characteristics, SAS transmitters and receivers, Power, Ready LED Out

Page 70
9.4.6SAS transmitters and receivers

NC - No connection in the drive.

9.4.6SAS transmitters and receivers

A typical SAS differential copper transmitter and receiver pair is shown in Figure 14. The receiver is AC cou- pling to eliminate ground shift noise.

 

TX

Transmitter

Differential

Transfer Medium

100

 

 

TY

Figure 14. SAS transmitters and receivers

.01

.01

RX

Receiver

100

RY

9.4.7Power

The drive receives power (+5 volts and +12 volts) through the SAS device connector.

Three +12 volt pins provide power to the drive, 2 short and 1 long. The current return for the +12 volt power supply is through the common ground pins. The supply current and return current must be distributed as evenly as possible among the pins.

Three +5 volt pins provide power to the drive, 2 short and 1 long. The current return for the +5 volt power sup- ply is through the common ground pins. The supply current and return current must be distributed as evenly as possible among the pins.

Current to the drive through the long power pins may be limited by the system to reduce inrush current to the drive during hot plugging.

9.5Signal characteristics

This section describes the electrical signal characteristics of the drive’s input and output signals. See Table 23 for signal type and signal name information.

9.5.1Ready LED Out

The Ready LED Out signal is driven by the drive as indicated in Table 24.

Table 24: Ready LED Out conditions

Normal command activity

 

LED status

 

 

 

Ready LED Meaning bit mode page 19h

0

 

1

 

 

 

 

Spun down and no activity

Off

 

Off

 

 

 

 

Spun down and activity (command executing)

On

 

On

 

 

 

 

Spun up and no activity

On

 

Off

 

 

 

 

Spun up and activity (command executing)

Off

 

On

 

 

 

 

Spinning up or down

 

Blinks steadily

(50% on and 50% off, 0.5 seconds on and off for 0.5 seconds)

60

Savvio 10K.2 SAS Product Manual, Rev. B

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Page 69 Page 71
Contents Savvio 10K.2 SAS ST9146802SS ST973402SSPage Savvio 10K.2 SAS October 06/23/06 Revision status summary sheetRev. A Initial releasePage 5.0 Reliability specifications Contents4.0 Performance characteristics 6.0 Physical/electrical specifications10.0 Seagate Technology support services 7.0 Defect and error management8.0 Installation 9.0 Interface requirementsList of Figures Page 1.0 Scope Figure 1. Savvio 10K.2 SAS disc driveSavvio 10K.2 SAS Product Manual, Rev. B 2.1.1 Electromagnetic compatibility 2.0 Applicable standards and reference documentation2.1 Standards 2.1.1.1 Electromagnetic susceptibilityAustralian C-Tick 2.1.2 Electromagnetic complianceElectromagnetic compliance for the European Union Korean MICSCSI Commands Reference Manual 2.2 Reference documentsSavvio 10K.2 SAS Installation Guide Specification for Acoustic Test Requirement and ProceduresSavvio 10K.2 SAS Product Manual, Rev. B 3.0 General description 3.2 Media description 3.1 Standard features3.3 Performance 3.5 Formatted capacities 3.7 Factory-installed accessories3.4 Reliability 3.6 Programmable drive capacity3.8 Factory-installed options 4.2 Seek performance characteristics 4.0 Performance characteristics4.1 Internal drive characteristics 4.2.1 Access timeGeneral performance characteristics 4.2.2 Format command execution time for 512-byte sectors minutes4.2.3 4.4 Prefetch/multi-segmented cache control 4.3 Start/stop time4.5 Cache operation 4.5.1 Caching write data 4.5.2 Prefetch operationSavvio 10K.2 SAS Product Manual, Rev. B Savvio 10K.2 SAS Product Manual, Rev. B 5.1.1 Recoverable Errors 5.0 Reliability specifications5.1 Error rates 5.1.2 Unrecoverable Errors5.1.4 Interface errors 5.2 Reliability and service5.1.3 Seek errors 5.2.2 Preventive maintenanceControlling S.M.A.R.T Fully-enabled delay5.2.4 S.M.A.R.T Performance impactPredictive failures Reporting controlDetermining rate 5.2.5 Thermal monitorDescription Table 11 Temperature Log Page 0DhParameter Code 5.2.6 Drive Self Test DST5.2.6.2.3 Short and extended tests 5.2.6.2.1 State of the drive prior to testing5.2.6.2.2 Invoking DST Short test Function Code 001b5.2.6.2.5 Abort 5.2.7 Product warranty5.2.6.2.4 Log page entries ShippingProduct repair and return information 6.2 DC power requirements 6.0 Physical/electrical specifications6.1 AC power requirements Table 12 ST9146802SS DC power requirementsTable 13 ST973402SS DC power requirements General DC power requirement notes6.2.3 Current profiles 6.2.2 Power sequencing6.2.1 Conducted noise immunity +12VFigure 3. ST973402SS current profile ST9146802SS in 3 Gbit operation 6.3 Power dissipationST973402SS in 3 Gbit operation 6.4 Environmental limits 6.4.1 Temperature6.4.4 Shock and vibration 6.4.2 Relative humidity6.4.3 Effective altitude sea level 6.4.4.1 ShockDrop height Packaged/product weightPackage size Figure 7. Recommended mounting6.4.4.2 Vibration 6.4.5 Air cleanliness6.4.6 Corrosive environment 6.4.7 Acoustics 6.4.8 Electromagnetic susceptibility6.5 Mechanical specifications Figure 8. Mounting configuration dimensionsSavvio 10K.2 SAS Product Manual, Rev. B 7.1 Drive internal defects/errors 7.0 Defect and error management7.2 Drive error recovery procedures Savvio 10K.2 SAS Product Manual, Rev. B Table 14 Read and write retry count maximum recovery times 7.3 SAS system errors7.4 Background Media Scan Maximum recovery time per7.6 Deferred Auto-Reallocation 7.5 Media Pre-Scan7.7 Idle Read After Write 8.0 Installation 8.1 Drive orientation8.2 Cooling Figure 10. Air flow8.3 Drive mounting 8.4 GroundingSavvio 10K.2 SAS Product Manual, Rev. B 9.1.1 task management functions 9.1 SAS features9.0 Interface requirements Table 15 SAS task management functions supported9.2 Dual port support 9.3 SCSI commands supported Table 17 Commands supported by Savvio SAS family driveTable 17 Commands supported by Savvio SAS family drive continued Table 17 Commands supported by Savvio SAS family drive continued Table 17 Commands supported by Savvio SAS family drive continued 9.3.2 Mode Sense data 9.3.1 Inquiry dataSavvio inquiry data Bytes3. Current values CHG = Changeable bits indicates if default value is changeable4. Changeable values MODE DATA HEADER 03 fa 00 10 00 00 00 BLOCK DESCRIPTOR Savvio 10K.2 SAS Product Manual, Rev. B Miscellaneous features 9.4 Miscellaneous operating features and conditionsMiscellaneous status 9.4.1 SAS physical interface Figure 11. Physical interfaceFigure 12. SAS device plug dimensions C OF DATUM B LFigure 13. SAS device plug dimensions detail 9.4.4 Electrical description 9.4.2 Physical characteristics9.4.3 Connector requirements 9.4.5 Pin descriptions9.4.6 SAS transmitters and receivers 9.5 Signal characteristics9.4.7 Power 9.5.1 Ready LED OutTable 26 General interface characteristics LED drive signal9.5.2 Differential signals 9.5.2.1 Eye masks 9.5.2.1.1 Eye masks overviewFigure 15. Receive eye mask 9.5.2.1.2 Receive eye mask9.5.2.1.3 Jitter tolerance masks Figure 16. Reveive tolerance eye maskPeak-to X2OP - 0, 5xadditional sinusoidal jitter - X1OPtion sinusoidal9.5.2.2 Transmitter signal characteristics Table 27 Transmitter signal characteristics9.5.2.3.1 Jitter 9.5.2.3 Receiver signal characteristicsTable 28 Receiver signal characteristics Table 29 Maximum allowable jitterTable 30 Receiver jitter tolerance 9.5.2.3.4 Impedance specifications9.5.2.3.2 Receiver jitter tolerance 9.5.2.3.3 Compliant jitter test pattern CJTPATTable 31 Impedance requirements Sheet 2 of R0 RR9.5.2.4.1 Transmitter characteristics 9.5.2.4 Electrical TxRx connections= -5, 437dB = -10, 884dB10 nF SAS internal connectorTx+ TCTF Tx Probe9.5.2.5 Receiver characteristics Figure 21. ISI loss example at 1.5 GbpsSeagate Service Centers 10.0 Seagate Technology support servicesOnline services Customer Service OperationsData Recovery Services USA/Canada/Latin America support services Seagate Service CentersEuropean support services Authorized Service CentersFAX services-All Europe toll call Africa/Middle East support servicesAsia/Pacific support services Toll-free support numbersWarranty Service Index NumericsPage Page See also cooling Page Seagate Technology LLC
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ST973402SS, ST9146802SS specifications

The Seagate ST973402SS and ST9146802SS are high-performance, enterprise-grade hard drives designed to meet the demanding needs of data-intensive applications. These drives are part of Seagate's Savvio and Barracuda product lines, aimed specifically at businesses and institutions requiring reliability, speed, and efficiency in storage solutions.

The ST973402SS is a 73GB, 2.5-inch hard drive, while the ST9146802SS offers a larger capacity of 146GB. Both models utilize a 10,000 RPM spindle speed, which significantly enhances their ability to handle fast data read and write operations. This speed ensures reduced latency and improved overall performance, making them ideal for environments where rapid access to data is crucial.

One of the standout features of these drives is their support for Serial Attached SCSI (SAS) interface. SAS technology provides a point-to-point connection, which allows for increased data transfer rates compared to traditional SATA drives. The ST973402SS and ST9146802SS are capable of transferring data at speeds of up to 600 MB/s, facilitating efficient data transfers in enterprise systems.

In terms of reliability, both models offer advanced features designed to improve data integrity and durability. They are built to withstand high workloads, with an annualized workload rate of up to 550 TB per year. This makes them well-suited for applications like databases and transactional storage, where sustained performance is required. Additionally, the drives feature Seagate’s PowerFit technology, which optimizes performance while minimizing power consumption.

To enhance data security, the drives come equipped with self-encrypting technology, ensuring that sensitive data is protected through hardware-based encryption. This is particularly important in environments where data breaches can lead to significant operational impacts.

The drives are also designed to operate efficiently in terms of thermal management, featuring robust heat dissipation capabilities. This helps to maintain optimal performance levels while prolonging the lifespan of the drives.

Overall, the Seagate ST973402SS and ST9146802SS are robust and reliable hard drives that cater to the needs of enterprise environments, combining high capacity, exceptional speed, advanced security features, and energy efficiency to help businesses maintain and manage large volumes of data effectively. With their proven performance and innovative technologies, these drives are well-equipped to support a wide range of applications in modern data centers.
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