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Seagate ST3500841NS manual Recording and interface technology, Physical characteristics, Seek time

Models: ST3500641NS ST3500841NS

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2.3Recording and interface technology

Interface

Serial ATA (SATA)

 

 

Recording method

16/17 EPRML

 

 

Recording density BPI (bits/inch max)

790.7k

 

 

Track density TPI (tracks/inch avg)

134.4k

 

 

Areal density (Gbits/inch2 avg)

106.35

Spindle speed (RPM) (± 0.2%)

7,200

 

 

Internal data transfer rate (Mbits/sec max)

754

 

 

Sustained transfer rate (Mbytes/sec)

65

 

 

I/O data-transfer rate (Mbytes/sec max)

300

 

 

Interleave

1:1

 

 

Cache buffer

8 Mbytes (8,192 kbytes) on ST3500841NS drives

 

16 Mbytes (16,384 kbytes) on ST3500641NS drives.

 

 

2.4Physical characteristics

Maximum height

 

(mm)

26.11

(inches)

1.028

 

 

Maximum width

 

(mm)

101.85

(inches)

4.010

 

 

Maximum length

 

(mm)

146.99

(inches)

5.787

 

 

Maximum weight

 

(grams)

710

(pounds)

1.57

 

 

2.5Seek 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 5,000 measurements of seeks between random tracks, less overhead.

Typical seek times (msec)

Read

Write

 

 

 

Track-to-track

0.8

1.0

 

 

 

Average

8.0

9.0

 

 

 

Average latency:

4.16

4.16

 

 

 

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.

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NL35 Series 7200.2 SATA Product Manual, Rev. C

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Seagate ST3500841NS, ST3500641NS manual Recording and interface technology, Physical characteristics, Seek time
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ST3500641NS, ST3500841NS specifications

The Seagate ST3500841NS and ST3500641NS are robust hard drives specifically designed for enterprise environments, catering to the demanding needs of data centers, server farms, and storage solutions. These drives are part of Seagate's enterprise series and reflect a commitment to reliability, performance, and capacity.

One of the main features of the ST3500841NS and ST3500641NS is their impressive storage capacity. The ST3500841NS offers 500GB of storage, while the ST3500641NS provides a slightly lower capacity at 640GB. Both drives utilize a standard 3.5-inch form factor, making them suitable for a variety of server and storage configurations. They operate at a high spindle speed of 7200 RPM, which contributes to faster data access and overall improved performance compared to traditional 5400 RPM drives.

These drives are designed to sustain high workloads and feature a mean time between failures (MTBF) rating that ensures reliability over extended periods of operation. With their enhanced error correction capabilities, data integrity is maintained even under heavy loads, making these drives ideal for use in critical applications where data loss is not an option.

The integration of technologies such as Native Command Queuing (NCQ) enhances the performance of these drives in multi-user environments. NCQ allows the drive to optimize the order of read and write commands, reducing latency and improving overall throughput. Furthermore, the ST3500841NS and ST3500641NS both feature an SATA interface, supporting speeds of up to 3.0 Gb/s, which is the standard for modern storage solutions.

Another noteworthy characteristic of these drives is their energy efficiency. Despite their robust performance, the ST3500841NS and ST3500641NS are designed to consume less power, thereby reducing operational costs and contributing to a more sustainable data center environment.

In summary, the Seagate ST3500841NS and ST3500641NS are purpose-built for enterprise applications, offering a blend of capacity, performance, and reliability. Their advanced technologies, coupled with impressive MTBF ratings and energy efficiency, make them suitable for critical applications in various high-demand environments. Whether utilized in small server systems or large-scale data centers, these drives provide the robust performance that businesses require in today’s data-driven landscape.