Seagate ST1000NM0033 START/STOP Time, PREFETCH/MULTI-SEGMENTED Cache Control, Cache Operation

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4.2START/STOP TIME

The drive accepts the commands listed in the SAS Interface Manual less than 3 seconds after DC power has been applied.

If the drive receives a NOTIFY (ENABLE SPINUP) primitive through either port and has not received a START STOP UNIT command with the START bit equal to 0, the drive becomes ready for normal operations within 30 seconds (excluding the error recovery procedure).

If the drive receives a START STOP UNIT command with the START bit equal to 0 before receiving a NOTIFY (ENABLE SPINUP) primitive, the drive waits for a START STOP UNIT command with the START bit equal to 1. After receiving a START STOP UNIT command with the START bit equal to 1, the drive waits for a NOTIFY (ENABLE SPINUP) primitive. After receiving a NOTIFY (ENABLE SPINUP) primitive through either port, the drive becomes ready for normal operations within 30 seconds (excluding the error recovery procedure).

If the drive receives a START STOP UNIT command with the START bit and IMMED bit equal to 1 and does not receive a NOTIFY (ENABLE SPINUP) primitive within 5 seconds, the drive fails the START STOP UNIT command.

The START STOP UNIT command may be used to command the drive to stop the spindle. Stop time is 23 seconds (maximum) from removal of DC power. SCSI stop time is 23 seconds. There is no power control switch on the drive.

4.3PREFETCH/MULTI-SEGMENTED CACHE CONTROL

The drive provides a prefetch (read look-ahead) and multi-segmented cache control algorithms that in many cases can enhance system performance. Cache refers to the drive buffer storage space when it is used in cache operations. To select this feature, the host sends the Mode Select command with the proper values in the applicable bytes in page 08h. Prefetch and cache operations are independent features from the standpoint that each is enabled and disabled independently using the Mode Select command; however, in actual operation, the prefetch feature overlaps cache operation somewhat as described in sections 4.4.1 and 4.4.2.

All default cache and prefetch mode parameter values (Mode Page 08h) for standard OEM versions of this drive family are given in Table 11.

4.4CACHE OPERATION

.

NOTE

Refer to the SAS Interface Manual for more detail concerning the cache bits.

Of the 128MB physical buffer space in the drive, approximately (60,000) KB can be used as a cache. The buffer is divided into logical segments from which data is read and to which data is written.

The drive keeps track of the logical block addresses of the data stored in each segment of the buffer. If the cache is enabled (see RCD bit in the SAS Interface Manual), data requested by the host with a read command is retrieved from the buffer, if possible, before any disk access is initiated. If cache operation is not enabled, the buffer is still used, but only as circular buffer segments during disk medium read operations (disregarding Prefetch operation for the moment). That is, the drive does not check in the buffer segments for the requested read data, but goes directly to the medium to retrieve it. The retrieved data merely passes through some buffer segment on the way to the host. All data transfers to the host are in accordance with buffer-full ratio rules. See the explanation provided with the information about Mode Page 02h (disconnect/reconnect control) in the SAS Interface Manual.

The following is a simplified description of the prefetch/cache operation:

Case A—read command is received and all of the requested logical blocks are already in the cache:

1.Drive transfers the requested logical blocks to the initiator.

Case B—A Read command requests data, and at least one requested logical block is not in any segment of the cache:

1.The drive fetches the requested logical blocks from the disk and transfers them into a segment, and then from there to the host in accordance with the Mode Select Disconnect/Reconnect parameters, page 02h.

2.If the prefetch feature is enabled, refer to section 4.4.2 for operation from this point.

Each cache segment is actually a self-contained circular buffer whose length is an integer number of logical blocks. The drive dynamically creates and removes segments based on the workload. The wrap-around capability of the individual segments greatly enhances the cache’s overall performance.

CONSTELLATION ES.3 SAS PRODUCT MANUAL, REV. B

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Contents Constellation ES.3 SAS Document Revision History Contents Installation Contents Seagate Technology Support Services SED ScopeStandards Applicable Standards and Reference DocumentationEuropean Union Restriction of Hazardous Substances RoHS Australian C-TickKorean KCC Taiwanese BsmiReference Documents China Restriction of Hazardous Substances RoHS DirectiveGeneral Description Standard Features Media DescriptionPerformance Programmable Drive Capacity FACTORY-INSTALLED OptionsReliability Formatted CapacitiesGeneral performance characteristics Performance CharacteristicsInternal Drive Characteristics Format command execution time for 512-byte sectors minutesSTART/STOP Time PREFETCH/MULTI-SEGMENTED Cache ControlCache Operation Prefetch operation Caching write dataReliability Specifications Error RatesReliability and Service 3 S.M.A.R.T Hot plugging the driveDetermining rate Controlling S.M.A.R.TPerformance impact Reporting controlImplementation State of the drive prior to testingDrive Self Test DST DST failure definitionExtended test Function Code 010b Invoking DSTShort and extended tests Short test Function Code 001bProduct repair and return information Product warrantyShipping StoragePHYSICAL/ELECTRICAL Specifications Powerchoicetm Power ManagementPowerChoice modes DC Power Requirements AC Power Requirements4TB drive DC power requirements 3TB drive DC power requirements 2TB drive DC power requirements 1TB drive DC power requirements General DC power requirement notes Power sequencingConducted noise immunity TB model current profiles Current profilesTB model current profiles TB model current profiles TB model current profiles Power Dissipation 4TB models in 3Gb operation4TB models in 6Gb operation 3TB models in 6Gb operation 3TB models in 3Gb operation2TB models in 6Gb operation 2TB models in 3Gb operation1TB models in 6Gb operation 1TB models in 3Gb operationRelative humidity Temperature a. OperatingEnvironmental Limits Image is for reference only, may not represent actual driveShock Shock and vibrationRecommended mounting Corrosive environment Air cleanlinessVibration Acoustics1TB Mechanical SpecificationsSecurity Level PurposeValidation Program Seagate Enterprise SEDRandom Number Generator RNG Controlled AccessAbout SELF-ENCRYPTING Drives Data EncryptionData Bands Authenticated Firmware DownloadPower Requirements Supported CommandsDefect and Error Management Drive Internal DEFECTS/ERRORSDrive Error Recovery Procedures Background Media Scan SAS System ErrorsProtection Information PI Media PRE-SCANDeferred AUTO-REALLOCATION Idle Read After WriteIdentifying a Protection Information drive Setting and determining the current Type LevelInstallation Drive OrientationCooling X = F 15lb = 67N Drive MountingGrounding Task management responses SAS FeaturesInterface Requirements Task management functionsScsi Commands Supported Supported commands Supported commands Supported commands Constellation ES.3 inquiry data Inquiry dataMode Sense data Block Descriptor CHG 9C 0A 9D 0F FF FF FF FF FF FF FF FF DEF 12 1400 FF FF 00 00 FF FF FF FF 80 20 00 00 00 00 00 Miscellaneous features Miscellaneous Operating Features and ConditionsSAS physical interface Datum B Section C C Section a a Pin descriptions Physical characteristicsConnector requirements Electrical descriptionReady LED Out PowerSignal Characteristics SAS transmitters and receiversDifferential signals SAS-2 Specification ComplianceAdditional Information Index Page KCC See also cooling Page Seagate Technology LLC
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ST1000NM0033 specifications

The Seagate ST1000NM0033 is a high-performance hard disk drive (HDD) designed specifically for enterprise applications. With a storage capacity of 1TB, it offers a balance of performance, reliability, and efficiency, making it suitable for data centers, cloud storage, and server environments. Built with Seagate's robust engineering, the ST1000NM0033 is ideal for handling heavy workloads and intensive data processes.

One of the standout features of this HDD is its rotational speed of 7200 RPM. This speed allows for quick data access and fast read/write operations, which is essential for data-intensive applications. The drive is equipped with 64MB of cache, further enhancing its efficiency by speeding up data retrieval for frequently accessed files.

Another key characteristic of the ST1000NM0033 is its SATA interface, which typically facilitates high-bandwidth data transfer rates. With a sustained data transfer rate of up to 160 MB/s, it ensures that large files, such as videos and databases, can be transferred swiftly, minimizing downtime and improving overall system performance.

The drive's durability is backed by Seagate’s Advanced Format technology, which enhances the format compatibility, storage efficiency, and reliability of the drive through improved error correction. With a mean time between failures (MTBF) rating of 1 million hours, users can trust the STA0033 to provide exceptional longevity and stability, critical in enterprise environments where data integrity is paramount.

Furthermore, the ST1000NM0033 supports various workload types due to its design optimized for multi-user environments. The drive can handle up to 180TB/year workload rate, making it capable of supporting applications with high data demand.

Environmentally, Seagate ensures that this model is energy efficient, contributing to reduced power consumption in enterprise settings. The drive operates effectively within a specified temperature range, ensuring that it remains operational under different environmental conditions.

In summary, the Seagate ST1000NM0033 is an excellent choice for businesses seeking a reliable, high-capacity HDD with robust performance features. Its combination of speed, efficiency, durability, and capacity positions it as a strong contender in the enterprise storage solutions market. With its extensive feature set, it continues to cater to the demanding needs of modern data centers and enterprise applications.
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