3.7Seek time

Seek measurements are taken with nominal power at 25°C ambient temperature. All times are measured using drive diagnostics. The specifications in the table below are defined as follows:

•Track-to-track seek time is an average of all possible single-track seeks in both directions.

•Average seek time is a true statistical random average of at least 5000 measurements of seeks between random tracks, less overhead.

Table 2:

Typical seek times

 

 

 

Typical seek times (ms)

Read

 

 

Track-to-track

1.5

 

 

 

Average

 

11.0

 

 

Full-stroke (ST9750423AS, ST9750423ASG, ST9640424AS,

27.0

ST9640423AS and ST9640423ASG models only)

 

 

 

Full-stroke (all other models)

22.0

 

 

Average latency (ST9750423AS, ST9750423ASG, ST9640424AS,

5.6

ST9640423AS and ST9640423ASG models only)

 

 

 

Average latency (all other models)

4.2

 

 

 

Note. These drives are designed to consistently meet the seek times represented in this manual. Physical seeks, regardless of mode (such as track-to-track and average), are expected to meet the noted values. However, due to the manner in which these drives are formatted, benchmark tests that include command overhead or measure logical seeks may produce results that vary from these specifications.

3.8Start/stop times

 

ST9750423AS, ST9750423ASG,

ST9750422AS, ST9750420AS,

 

ST9640424AS, ST9640423AS

ST9750420ASG, ST9500424AS,

 

and ST9640423ASG,

ST9500423AS and ST9500423ASG

 

 

 

 

 

Time to ready

Typical

Max @ 25°C

Typical

Max @ 25°C

 

 

 

 

 

Power-on to Ready (sec)

3.6

5.1

4.0

5.5

 

 

 

 

 

Standby to Ready (sec)

2.5

4.0

3.0

4.5

 

 

 

 

 

8

Momentus Product Manual, Rev. C

Page 13 Page 15
Page 14
Image 14
Seagate ST9750422AS, ST9750424AS, ST9750423ASG, ST9750420ASG Seek time, Start/stop times, Typical seek times ms Read
Page 13 Page 15

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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