Seagate ST3300656SS, ST3146356SS, ST3450856SS manual General description

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3.0General description

Cheetah drives combine perpendicular recording, giant magnetoresistive (GMR) heads, partial response/max- imum likelihood (PRML) read channel electronics, embedded servo technology, and a Serial Attached SCSI (SAS) interface to provide high performance, high capacity data storage for a variety of systems including engi- neering workstations, network servers, mainframes, and supercomputers. The Serial Attached SCSI interface is designed to meet next-generation computing demands for performance, scalability, flexibility and high-den- sity storage requirements.

Cheetah drives are random access storage devices designed to support the Serial Attached SCSI Protocol as described in the ANSI specifications, this document, and the SAS Interface Manual (part number 100293071) which describes the general interface characteristics of this drive. Cheetah drives are classified as intelligent peripherals and provide level 2 conformance (highest level) with the ANSI SCSI-1 standard. The SAS connec- tors, cables and electrical interface are compatible with Serial ATA (SATA), giving future users the choice of populating their systems with either SAS or SATA hard disk drives. This allows you to continue to leverage your existing investment in SCSI while gaining a 3Gb/s serial data transfer rate.

The head and disk assembly (HDA) is sealed at the factory. Air recirculates within the HDA through a non- replaceable filter to maintain a contamination-free HDA environment.

Note. Never disassemble the HDA and do not attempt to service items in the sealed enclosure (heads, media, actuator, etc.) as this requires special facilities. The drive does not contain user-replaceable parts. Opening the HDA for any reason voids your warranty.

Cheetah drives use a dedicated landing zone at the innermost radius of the media to eliminate the possibility of destroying or degrading data by landing in the data zone. The heads automatically go to the landing zone when power is removed from the drive.

An automatic shipping lock prevents potential damage to the heads and disks that results from movement dur- ing shipping and handling. The shipping lock disengages and the head load process begins when power is applied to the drive.

Cheetah drives decode track 0 location data from the servo data embedded on each surface to eliminate mechanical transducer adjustments and related reliability concerns.

The drives also use a high-performance actuator assembly with a low-inertia, balanced, patented, straight arm design that provides excellent performance with minimal power dissipation.

Cheetah 15K.6 SAS Product Manual, Rev. A

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Contents ST3450856SS ST3300656SS ST3146356SS Cheetah 15K.6 SASPage Contents Installation Defect and error managementSeagate Technology support services Interface requirementsCheetah 15K.6 SAS disk drive List of FiguresCheetah 15K.6 SAS Product Manual, Rev. a Cheetah 15K.6 SAS disk drive ScopeCheetah 15K.6 SAS Product Manual, Rev. a Standards Standards, compliance and reference documentsElectromagnetic compatibility Electromagnetic susceptibilityEuropean Union Restriction of Hazardous Substances RoHS ComplianceReference documents Cheetah 15K.6 SAS Product Manual, Rev. a General description Media description Standard featuresPerformance Options factory installed Factory-installed accessoriesReliability Formatted capacitiesCheetah 15K.6 SAS Product Manual, Rev. a Internal drive characteristics Performance characteristicsAccess time Seek timeGeneral performance characteristics Format command execution time minutesStart/stop time Cache operation Prefetch/multi-segmented cache controlPrefetch operation Caching write dataError rates Reliability specificationsRecoverable Errors Unrecoverable ErrorsSeek errors Reliability and serviceInterface errors Preventive maintenanceControlling S.M.A.R.T 4 S.M.A.R.TPerformance impact MillisecondsDetermining rate Reporting controlPredictive failures Thermal monitorPrimary Temperature Temperature Log Page 0DhReference Temperature Parameter Code DescriptionInvoking DST State of the drive prior to testingShort and extended tests Short test Function Code 001bAbort Product warrantyShipping Product repair and return informationCheetah 15K.6 SAS Product Manual, Rev. a AC power requirements Physical/electrical specificationsDC power requirements ST3450856SS DC power requirementsST3146356SS DC power requirements ST3300656SS DC power requirementsST3300656SS Gbit mode Amps ST3146356SS Gbit mode AmpsPower sequencing General DC power requirement notesConducted noise immunity Current profilesTypical ST3450856SS current profiles Typical ST3300656SS current profiles Typical ST3146356SS current profiles ST3450856SS in 3 Gbit operation Power dissipationST3300656SS in 3 Gbit operation ST3300656SS CURRENT/POWER vs Throughput SAS 3.0GBST3146356SS in 3 Gbit operation ST3146356SS CURRENT/POWER vs Throughput SAS 3.0GBRandom 8 Block Reads Environmental limits TemperatureEffective altitude sea level Relative humidityShock and vibration ShockRecommended mounting Package size Packaged/product weight Drop heightVibration Air cleanlinessAcoustics Corrosive environmentMechanical specifications Physical dimensions Cheetah 15K.6 SAS Product Manual, Rev. a Drive internal defects/errors Defect and error managementDrive error recovery procedures 51.87 Background Media Scan SAS system errorsMedia Pre-Scan Idle Read After Write Deferred Auto-ReallocationDrive orientation InstallationAir flow CoolingGrounding Drive mountingCheetah 15K.6 SAS Product Manual, Rev. a Interface requirements SAS featuresDual port support Commands supported by Cheetah 15K.6 SAS family drives Scsi commands supportedCommand name Command code Supported Commands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Inquiry data Mode Sense dataBytes Data hex Page Mode Pages 2.1 ST3450856SS Mode Sense data2.2 ST3300656SS Mode Sense data 2.3 ST3146356SS Mode Sense data Miscellaneous features Miscellaneous operating features and conditionsSupported Feature or condition Miscellaneous statusSAS physical interface Datum B Connector requirements Physical characteristicsElectrical description Pin Signal name Signal typePin descriptions SAS pin descriptionsPower Signal characteristicsSAS transmitters and receivers Ready LED OutDifferential signals LED drive signalGeneral interface characteristics Eye masks Eye masks overviewJitter tolerance masks Receive eye maskAbsolute amplitude Normalized time in UISinusoidal Peak-toJitter Frequency in kHzSignal characteristica Units Gbps Transmitter signal characteristicsSignal characteristic Units Gbps Receiver signal characteristicsMaximum allowable jitter Gbps m, n Deterministic jitterqReceiver jitter tolerance Impedance specificationsCompliant jitter test pattern Cjtpat Impedance requirements Sheet 1Impedance requirements Sheet 2 Transmitter characteristicsElectrical TxRx connections = -5,437dB Shows the zero-length test load Receiver characteristics Cheetah 15K.6 SAS Product Manual, Rev. a Internet Seagate Technology support servicesPresales Support Technical SupportData Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call Center Toll-free Direct dial Numerics IndexPage SAS See also cooling
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