3.1Standard features

Cheetah drives have the following standard features:

1.5 / 3 Gbit Serial Attached SCSI (SAS) interface

Integrated dual port SAS controller supporting the SCSI protocol

Support for SAS expanders and fanout adapters

Firmware downloadable using the SAS interface

128-deep task set (queue)

Supports up to 32 initiators

Jumperless configuration.

User-selectable logical block size (512, 520, 524, or 528 bytes per logical block)

Perpendicular recording technology

Programmable logical block reallocation scheme

Flawed logical block reallocation at format time

Programmable auto write and read reallocation

Reallocation of defects on command (Post Format)

ECC maximum burst correction length of 320 bits

No preventive maintenance or adjustments required

Dedicated head landing zone

Embedded servo design

Automatic shipping lock

Embedded servo design

Self diagnostics performed when power is applied to the drive

Zone bit recording (ZBR)

Vertical, horizontal, or top down mounting

Dynamic spindle brake

16 Mbyte data buffer (see Section 4.5).

Drive Self Test (DST)

Background Media Scan (BGMS)

Power Save

3.2Media description

The media used on the drive has an aluminum substrate coated with a thin film magnetic material, overcoated with a proprietary protective layer for improved durability and environmental protection.

3.3Performance

Programmable multi-segmentable cache buffer

300 Mbytes/sec maximum instantaneous data transfers.

15k RPM spindle. Average latency = 2.0 msec

Background processing of queue

Supports start and stop commands (spindle stops spinning)

Adaptive seek velocity; improved seek performance

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Cheetah T10 SAS Product Manual, Rev. A

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Seagate ST373355SS, ST3146755SS, ST3300555SS manual Standard features, Media description, Performance

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.