Seagate ST9640322AS, ST9640320AS, ST9500320AS, ST9400321AS manual About the Serial ATA interface

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2.1About the Serial ATA interface

The Serial ATA interface provides several advantages over the traditional (parallel) ATA interface. The primary advantages include:

Easy installation and configuration with true plug-and-play connectivity. It is not normally necessary to set any jumpers or other configuration options.

Thinner and more flexible cabling for improved enclosure airflow and ease of installation.

Scalability to higher performance levels.

In addition, Serial ATA makes the transition from parallel ATA easy by providing legacy software support. Serial ATA was designed to allow you to install a Serial ATA host adapter and Serial ATA disc drive in your current system and expect all of your existing applications to work as normal.

The Serial ATA interface connects each disc drive in a point-to-point configuration with the Serial ATA host adapter. There is no master/slave relationship with Serial ATA devices like there is with parallel ATA. If two drives are attached on one Serial ATA host adapter, the host operating system views the two devices as if they were both “masters” on two separate ports. This essentially means both drives behave as if they are Device 0 (master) devices.

Note. The host adapter may, optionally, emulate a master/slave environment to host software where two devices on separate Serial ATA ports are represented to host software as a Device 0 (master) and Device 1 (slave) accessed at the same set of host bus addresses. A host adapter that emulates a master/slave environment manages two sets of shadow registers. This is not a typical Serial ATA environment.

The Serial ATA host adapter and drive share the function of emulating parallel ATA device behavior to provide backward compatibility with existing host systems and software. The Command and Control Block registers, PIO and DMA data transfers, resets, and interrupts are all emulated.

The Serial ATA host adapter contains a set of registers that shadow the contents of the traditional device regis- ters, referred to as the Shadow Register Block. All Serial ATA devices behave like Device 0 devices. For addi- tional information about how Serial ATA emulates parallel ATA, refer to the “Serial ATA: High Speed Serialized AT Attachment” specification. The specification can be downloaded from http://www.serialata.org.

Momentus Product Manual, Rev. D

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Contents Momentus Revision Date Revision historyContents Momentus Product Manual, Rev. D List of Figures Page Seagate Online Support and Services Seagate Technology support servicesIntroduction 4K byte/sector modelsByte/sector models About the Serial ATA interface Drive specifications Specification summary tableDrive specifications for 640, 500 and 400GB models To 12,192 m -1000 ft to 40,000 ft Drive specifications for 320, 250 and 160GB models Drive specifications for 320, 250 and 160GB models LBA mode Default logical geometryFormatted capacity Physical organizationRecording and interface technology Physical characteristicsSeek time Typical seek timesStart/stop times Power specificationsDeferred spinup Typical current profileConducted noise Voltage tolerancePower management modes Power-management modesActive mode Idle modeEnvironmental specifications Operating shock ShockNonoperating shock VibrationAcoustics Drive A-weighted Sound Power Levels SWL, BAElectromagnetic immunity Test for Prominent Discrete Tones PDTsMeasurement type Specification Safety certificationReliability Agency certificationKorean RRL Australian C-Tick N176FCC verification Corrosive environment Environmental protectionEuropean Union Restriction of Hazardous Substances RoHS China Restriction of Hazardous Substances RoHS DirectiveHandling and static-discharge precautions Configuring and mounting the driveSerial ATA cables and connectors Configuring the driveTop cover stiffness/deflection Drive mountingMeasurements shown in are in inches Signal Serial ATA connector pin definitionsSerial ATA Sata interface Segment Pin Function DefinitionP10 Ground 2nd mate P11 Reserved Pin Function DefinitionCommand name Command code in hex ATA-standard commands Supported ATA commandsATA-standard security commands Command name Command code in hexWord Description Value Identify Device commandXx07H Description if bit is set to Bit Set Features command values Set Features command3 S.M.A.R.T. commands M.A.R.T. commandsCode in features register A.R.T. command Momentus Product Manual, Rev. D Index Page Page Momentus Product Manual, Rev. D Page Seagate Technology LLC