Seagate ST3300655LC 300GB Ultra320 SCSI front view Seagate ST3300655LC 300GB Ultra320 SCSI front view
Seagate ST3300655LC 300GB Ultra320 SCSI front view Seagate ST3300655LC 300GB Ultra320 SCSI front view
Seagate ST3300655LC top view Seagate ST3300655LC top view
Seagate ST3300655LC angled view Seagate ST3300655LC angled view
Seagate ST3300655LC 300GB Ultra320 SCSI front view
Seagate ST3300655LC 300GB Ultra320 SCSI front view
Seagate ST3300655LC top view
Seagate ST3300655LC angled view

Seagate

Seagate ST3300655LC – 300GB | Ultra320 SCSI 80-Pin | 15K RPM | 3.5" | Enterprise HDD

$249.99
Tax included.

Brand New, Factory Sealed | In Stock | Bulk Orders Available

Brand New, Factory Sealed | In Stock | Bulk Orders AvailableThe ST3300655LC is a 300GB Ultra320 SCSI hard drive featuring 15,000 RPM, 16MB cache, and 3.5ms average seek time in a 3.5" form factor. Built for enterprise storage systems demanding high performance, it is ideal for mission-critical applications, database servers, and high-transaction environments. Compatible with SCSI hot swap trays and enterprise storage controllers. This Cheetah 15K.5 series drive was the first to break the 100MB sustained transfer rate barrier, delivering up to 125MB/s performance.
Specifications
  • Manufacturer: Seagate
  • Model: ST3300655LC
  • Capacity: 300GB
  • Interface: Ultra320 SCSI 80-Pin
  • Spindle Speed: 15,000 RPM
  • Cache: 16MB
  • Form Factor: 3.5"
  • Seek Time: 3.5ms average
  • Latency: 2.0ms average
  • MTBF: 1,400,000 hours
  • Drive Type: Enterprise
  • Warranty: 90 days
Product Features
  • Ultra320 SCSI interface with 320MB/s transfer rate
  • 15,000 RPM spindle speed for maximum performance
  • 16MB cache buffer for improved throughput
  • 3.5ms average seek time
  • 2.0ms average latency
  • SCA-2 80-pin hot-swap connector
  • Perpendicular recording technology
  • Background media scan (BMS) capability
Compatibility

Compatible with Ultra320 SCSI controllers, enterprise servers, and SCSI hot-swap enclosures. Not compatible with SATA, SAS, or IDE interfaces.
Shipping & Returns
  • Free Shipping: We currently offer free Economy Shipping within the continental U.S. with no minimum order required. Expedited shipping is available at standard carrier rates.
  • Same-Day Shipping: Order placed before 2PM PST will ship the same day. Orders received after this time will ship the following business day.
  • Hassle-Free Returns: If you're not completely satisfied with your purchase, simply return it within 10 days for a hassle-free refund or exchange.

300GB Ultra320 SCSI 15K RPM Enterprise Performance Factory Sealed

Why the ST3300655LC is the right Enterprise HDD

The Cheetah 15K.5 series represents Seagate's flagship enterprise SCSI technology from the mid-2000s era. With 15,000 RPM performance and Ultra320 SCSI interface, it delivers exceptional throughput for demanding server applications. This generation pioneered perpendicular recording technology for higher density storage while maintaining enterprise-grade reliability standards.

Ultra320 SCSI High-Speed Interface

Features 320MB/s Ultra320 SCSI interface with 80-pin SCA-2 connector for maximum bandwidth and hot-swap capability in enterprise environments.

15K RPM Maximum Performance

Industry-leading 15,000 RPM spindle speed delivers 3.5ms average seek time and 2.0ms latency for mission-critical applications requiring instant data access.

Enterprise-Grade Reliability

1.4 million hour MTBF rating with advanced error correction and background media scanning ensures continuous operation in demanding server environments.

Perpendicular Recording Technology

Advanced perpendicular recording provides 300GB capacity with improved data density and reliability compared to longitudinal recording methods.

Brand New, Factory Sealed Stock

Available as new factory sealed units — ideal for legacy system maintenance, vintage computing projects, and enterprise storage upgrades.

Helpful Resources

Find success stories, datasheets, and references to help you achieve your goals.

Seagate Cheetah 15K.5 Datasheet
Seagate Cheetach 15K.5 Product Manual
Seagate Cheetah 15K.5 Product Overview
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Frequently Asked Questions

Frequently asked questions for SCSI, including information on usage, configuration, and compatibility.

1. What is a SCSI hard drive?

A SCSI (Small Computer System Interface) hard drive is a legacy enterprise storage device that connects using parallel ribbon cables. SCSI was widely used in servers, workstations, and storage arrays before newer technologies like SAS and SATA became standard.
2. What systems are SCSI hard drives compatible with?

SCSI drives are designed for older servers, RAID controllers, and storage arrays that have SCSI interfaces. They are commonly used today to maintain or repair legacy IT infrastructure.
3. What’s the difference between SCSI and SAS?

SCSI uses parallel communication and bulky ribbon cables, with speeds up to 320 MB/s. SAS (Serial Attached SCSI) is the modern successor, offering serial communication, smaller connectors, dual-port redundancy, and speeds up to 24 Gb/s.
4. Can SCSI hard drives still be used in modern systems?

Most modern computers don’t have SCSI ports. To use a SCSI drive, you’ll need a compatible SCSI controller card or an external enclosure designed for parallel SCSI.
5. What capacities are available for SCSI hard drives?

SCSI hard drives were typically available in capacities ranging from a few gigabytes to several hundred gigabytes. Larger capacities are rare compared to modern SATA and SAS drives.
6. Are SCSI hard drives hot-swappable?

Yes, many SCSI drives used in enterprise servers were hot-swappable when paired with a compatible RAID backplane or enclosure. This allowed replacement without shutting down the system.
7. Why are SCSI hard drives still used today?

SCSI hard drives remain important for maintaining legacy servers, specialized equipment, and industrial systems where upgrading to newer storage technologies isn’t possible or practical.