4.0Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of Cheetah drives.

4.1Internal drive characteristics

 

ST3300555SS

ST3146755SS

ST373355SS

Gbytes (formatted, rounded off value)*,**

Drive capacity

300.0

146.8

73.4

Read/write data heads

8

4

2

 

Tracks per surface (total)

74,340

74,340

74,340

Tracks (user accessible)

Tracks per inch

125,000

125,000

125,000

TPI

Peak bits per inch

890k

890k

890k

KBPI

Areal Density

110

110

110

Gbits/inch2

Internal data rate

960 to 1607

960 to 1607

960 to 1607

Mbits/sec (variable with zone)

Disc rotation speed

15k

15k

15k

rpm

Avg rotational latency

2.0

2.0

2.0

msec

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

**Rounded off value.

4.2Seek time

See Section 9.4.1, "SAS physical interface" on page 57 and the SAS Interface Manual (part number 100293071) for additional timing details.

4.2.1Access time

Not Including controller overhead1, 2 (msec)

 

 

Read

Write

Average

Typical

3.5

4.0

Single track

Typical

0.2

0.4

Full stroke

Typical

6.8

7.5

1.Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as measured on a representative sample of drives.

2.Access to data = access time + latency time.

Cheetah T10 SAS Product Manual, Rev. A

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Seagate ST373355SS, ST3146755SS manual Performance characteristics, Internal drive characteristics, Seek time, Access time

ST3300555SS, ST3146755SS, ST373355SS specifications

The Seagate ST373355SS, ST3146755SS, and ST3300555SS represent a range of high-performance hard drives designed for enterprise applications, particularly in server environments requiring reliability, speed, and high capacity.

The ST373355SS is a 73.5 GB SCSI hard drive operating at 15,000 RPM, which ensures rapid data access and superior performance, making it ideal for transactional applications and data-intensive tasks. With its 4 MB cache, the drive leverages fast read and write speeds, enhancing overall system responsiveness. The SCSI interface, operating at 80 MB/s, allows for high-speed data transfers, making it a suitable choice for demanding environments where quick access to information is critical. Its hot-swappable feature enables maintenance without shutting down the system, maximizing uptime and productivity.

The ST3146755SS, with a capacity of 146.8 GB, builds on the performance of its predecessor while introducing improvements in data handling and reliability. Operating at the same impressive 15,000 RPM, this model also features a 16 MB cache that greatly improves data throughput and access speed. The drive is designed to reduce latency, which is crucial for applications where timing is everything. It is equipped with advanced error recovery features and Seagate’s innovative PowerTrim technology, which improves power efficiency during read and write operations. The ST3146755SS also features a higher mean time between failures (MTBF), underscoring its reliability in high-demand environments.

Lastly, the ST3300555SS offers even greater capacity with 300 GB. This drive maintains the 15,000 RPM rotation speed and benefits from a 16 MB cache, providing a balance of speed and storage capacity. Its advanced SCSI interface supports not just speed but also data integrity, ensuring consistent performance during extensive data transfers. The drive is designed to handle workloads naturally associated with enterprise servers, data warehouses, and video editing applications. Its rugged build supports continuous operation and is tested for high-temperature environments to ensure durability.

In summary, the Seagate ST373355SS, ST3146755SS, and ST3300555SS hard drives are engineered for enterprise environments, combining impressive RPM speeds, significant storage capacities, and advanced technologies to deliver reliability, performance, and efficiency for critical applications. These hard drives represent Seagate's commitment to providing solutions that meet the rigorous demands of modern data environments.