Seagate ST9500428AS Formatted capacity, Default logical geometry, Physical organization, LBA mode

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3.2Formatted capacity

Model

Formatted capacity*

Guaranteed sectors

Bytes per sector

(logical)

 

 

 

 

 

 

 

ST9750423AS, ST9750423ASG,

750GB

1,465,149,168

 

ST9750422AS, ST9750420AS and

 

ST9750420ASG

 

 

 

 

 

 

 

ST9640424AS, ST9640423AS and

640GB

1,250,263,728

512

ST9640423ASG

 

 

 

 

 

 

 

 

ST9500424AS, ST9500423AS and

500GB

976,773,168

 

ST9500423ASG

 

 

 

 

 

 

 

 

*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment and formatting.

3.2.1LBA mode

When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to n–1,where n is the number of guaranteed sectors as defined above.

See Section 5.3.1, "Identify Device command" (words 60-61 and 100-103) for additional information about 48- bit addressing support of drives with capacities over 137GB.

3.3Default logical geometry

Cylinders

Read/write heads

Sectors per track

 

 

 

16,383

16

63

 

 

 

LBA mode

When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to n–1,where n is the number of guaranteed sectors as defined above.

3.4

Physical organization

 

 

 

 

 

Drive model

Read/write heads

Number of discs

 

 

 

ST9750423AS, ST9750423ASG, ST9750422AS,

 

 

ST9750420AS and ST9750420ASG

4

 

 

 

2

ST9640424AS, ST9640423AS and ST9640423ASG

 

 

 

 

 

 

ST9500424AS, ST9500423AS and ST9500423ASG

4/3

 

 

 

 

 

6

Momentus Product Manual, Rev. C

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Page 11 Page 13
Contents Momentus Standard models Free-fall sensor modelsRevision history Revision Date Sheets affected or commentsContents Momentus Product Manual, Rev. C List of Figures Page Seagate Technology support services Seagate Online Support and ServicesIntroduction Standard models Free Fall Protection modelsAbout the Serial ATA interface Drive specifications Specification summary tableDrive specifications for 750, 640 and 500 GB models Altitude, nonoperating Default logical geometry LBA modeFormatted capacity Physical organizationPhysical characteristics Drive specificationRecording and interface technology Seek time Start/stop timesTypical seek times Typical seek times ms ReadPower specifications Typical current profile Conducted noise Voltage tolerancePower-management modes Power management modesActive mode Idle modeEnvironmental specifications Shock Operating shockNonoperating shock VibrationDrive A-weighted Sound Power Levels SWL, BA AcousticsElectromagnetic immunity Test for Prominent Discrete Tones PDTsFree Fall Protection feature Safety certificationReliability Agency certificationKorean RRL Australian C-Tick N176FCC verification Environmental protection Corrosive environmentEuropean Union Restriction of Hazardous Substances RoHS China Restriction of Hazardous Substances RoHS DirectiveConfiguring and mounting the drive Handling and static-discharge precautionsConfiguring the drive Serial ATA cables and connectorsMounting dimensions-top, side and end view Drive mountingSerial ATA Sata interface Hot-Plug compatibilitySerial ATA device plug connector pin definitions Serial ATA connector pin definitionsSignal Pin Function DefinitionSupported ATA commands Command name Command code in hex ATA-standard commandsCommand name Command code in hex ATA-standard security commandsIdentify Device command Word Description ValueXxxxH Fffeh Description if bit is set to Bit Set Features command Set Features command values3 S.M.A.R.T. commands A.R.T. commandsCode in features register A.R.T. command Momentus Product Manual, Rev. C Index ITE TPI Momentus Product Manual, Rev. C Page Seagate Technology LLC
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ST9500428AS, ST9640422AS, ST9750423ASG, ST9750420AS, ST9750420ASG specifications

The Seagate ST9750422AS, ST9750423AS, ST9500423ASG, ST9640423ASG, and ST9500423AS are part of Seagate's popular lineup of SATA hard drives designed for consumer and enterprise applications. These drives are recognized for their reliability, performance, and advanced technologies, making them suitable for a variety of storage needs.

The ST9750422AS and ST9750423AS models are 7200 RPM drives with a storage capacity of 750 GB, while the ST9500423ASG and ST9640423ASG offer different capacities and characteristics tailored for specific uses. The ST9500423ASG typically features a 500 GB capacity, while the ST9640423ASG is often found with 640 GB of storage space. These drives support the Serial ATA interface, ensuring high-speed data transfer rates and compatibility with a broad range of host systems.

All drives in this series feature a robust 32 MB cache that enhances performance by allowing faster access to frequently used data. This cache is critical, especially for read/write operations that require rapid data retrieval, making these models well-suited for tasks ranging from simple home computing to more intensive applications such as gaming and multimedia editing.

The ST9750422AS and ST9750423AS models are built with technologies such as Advanced Format, which improves storage capacity and enhances error correction. Additionally, these drives employ Seagate's PowerBalance and PowerFin technologies, enabling efficient power management without compromising performance.

Reliability is a core characteristic of the Seagate ST9XXX series, featuring a mean time between failures (MTBF) of over a million hours, which translates to increased system uptime and reduced potential for data loss. The drives also include features such as Native Command Queuing (NCQ), which optimizes the processing of multiple read/write commands, further boosting performance during heavy workloads.

In conclusion, the Seagate ST9750422AS, ST9750423AS, ST9500423ASG, ST9640423ASG, and ST9500423AS hard drives represent a blend of speed, reliability, and advanced technology, making them an excellent choice for users looking for dependable storage solutions. Whether for a home PC or an enterprise server, these drives continue to deliver outstanding performance and value in a competitive market.
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