Seagate Understanding Mode Sense Data for Brush Cutters
Page 69

9.3.2Mode Sense data

The Mode Sense command provides a means for the drive to report its operating parameters to the initiator. The drive maintains four sets of Mode parameters, Default values, Saved values, Current values and Change- able values.

Default values are hard coded in the drive firmware that is stored in flash EPROM nonvolatile memory on the drive PCBA. Default values can be changed only by downloading a complete set of new firmware into the flash EPROM. An initiator can request and receive from the drive a list of default values and use those in a Mode Select command to set up new current and saved values, where the values are changeable.

Saved values are stored on the disc media using a Mode Select command. Only parameter values that are allowed to be changed can be changed by this method. See “Changeable values” defined below. Parameters in the saved values list that are not changeable by the Mode Select command get their values from the default values storage.

Current values are volatile values currently being used by the drive to control its operation. A Mode Select command can be used to change these values (only those that are changeable). Originally, they are installed from saved or default values after a power on reset, hard reset, or Bus Device Reset message.

Changeable values form a bit mask, stored in nonvolatile memory, that dictates which of the current values and saved values can be changed by a Mode Select command. A “one” allows a change to a corresponding bit; a “zero” allows no change. For example, in Table 7 refer to Mode page 01, in the row entitled “CHG”. These are hex numbers representing the changeable values for mode page 01. Note that bytes 04, 05, 06, and 07 are not changeable, because those fields are all zeros. If some changeable code had a hex value EF, that equates to the binary pattern 1110 1111. If there is a zero in any bit position in the field, it means that bit is not changeable. Bits 7, 6, 5, 3, 2, 1, and 0 are changeable, because those bits are all ones. Bit 4 is not changeable.

Though the drive always reports non-zero values in bytes 00 and 01, those particular bytes are never change- able.

The Changeable values list can only be changed by downloading new firmware into the flash EPROM.

On standard OEM drives the Saved values are taken from the default values list and stored into the saved val- ues storage location on the media prior to shipping.

When a drive is powered up, it takes saved values from the media and stores them to the current values stor- age in volatile memory. It is not possible to change the current values (or the saved values) with a Mode Select command before the drive is up to speed and is “ready.” An attempt to do so results in a “Check Condition sta- tus being returned.

Note. Because there may be several different versions of drive control firmware in the total population of drives in the field, the Mode Sense values given in the following tables may not exactly match those of some drives.

The following tables list the values of the data bytes returned by the drive in response to the Mode Sense com- mand pages for SCSI Ultra160 implementation (see the SCSI Interface Product Manual).

Definitions:

DEF = Default value. Standard drives are shipped configured this way.

CHG= Changeable bits; indicates if current and saved values are changeable.

Note. Saved values for OEM drives are normally the same as the default values.

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

59

Page 68 Page 70
Image 69
Page 68 Page 70
Contents Cheetah 10K.7 Scsi Page Cheetah 10K.7 Scsi Page Revision status summary sheet Page Contents Installation Defect and error managementSeagate Technology support services Interface requirementsList 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 Standards Applicable standards and reference documentationElectromagnetic compatibility Electromagnetic susceptibilityEuropean Union Restriction of Hazardous Substances RoHS Electromagnetic complianceReference documents Cheetah 10K.7 Scsi Product Manual, Rev. D General description Media characteristics Standard featuresPerformance ReliabilityFormatted capacities Options factory installed Factory installed accessoriesAccessories user installed Programmable drive capacityPerformance characteristics Internal drive characteristics transparent to userScsi performance characteristics visible to user Format command execution time minutes Access timeGeneralized performance characteristics Ultra320 ScsiStart/stop time Prefetch/multi-segmented cache controlCache operation Caching write data Prefetch operation Cheetah 10K.7 Scsi Product Manual, Rev. D Error rates Reliability specificationsRecoverable Errors Unrecoverable ErrorsSeek errors Reliability and servicePreventive maintenance Annualized Failure Rate AFRControlling S.M.A.R.T 4 S.M.A.R.TReporting control Performance impactDetermining rate Predictive failuresDrive Self Test DST Parameter Code DescriptionDST Failure Definition State of the drive prior to testingImplementation Invoking DSTShort test Function Code 001b Product warrantyExtended test Function Code 010b Log page entriesProduct repair and return information ShippingPhysical/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 ST3300007 Power dissipationST3146707 ST373207 Environmental limits TemperatureRelative humidity Effective altitude sea levelShock Shock and vibrationRecommended mounting Air cleanliness VibrationCorrosive environment Acoustics Mechanical specificationsLW mounting configuration dimensions LC mounting configuration dimensions Defect and error management Drive error recovery proceduresDrive internal defects Page Scsi systems errors Media Pre-Scan Background Media ScanConfigure drive options InstallationDrive ID/option select header FormattingJ6 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 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 Condition/feature supported by Scsi bus conditions and miscellaneous features supportedPhysical interface Synchronous data transferSynchronous data transfer periods supported 2 REQ/ACK offsetDC cable and connector PCB Scsi interface physical description Scsi interface cable requirements Mating connectorsCable requirements LC ModelsMating 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 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 Drive activity LED Spindle status Command status LED statusInternet MySeagate Reseller.seagate.com Seagate Technology support servicesPresales Support 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 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.
Top Page Image Contents