Seagate ST3146855LW Cheetah 15K.5 147GB Ultra320 SCSI front view Seagate ST3146855LW Cheetah 15K.5 147GB Ultra320 SCSI front view
Seagate ST3146855LW Cheetah 15K.5 147GB Ultra320 SCSI front view Seagate ST3146855LW Cheetah 15K.5 147GB Ultra320 SCSI front view
Seagate ST3146855LW top view Seagate ST3146855LW top view
Seagate ST3146855LW Cheetah 15K.5 147GB Ultra320 SCSI front view
Seagate ST3146855LW Cheetah 15K.5 147GB Ultra320 SCSI front view
Seagate ST3146855LW top view

Seagate

Seagate Cheetah 15K.5 ST3146855LW – 146.8GB | Ultra320 SCSI 68-Pin | 15,000 RPM | 3.5" | Enterprise HDD

$599.95
Tax included.

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

Brand New, Factory Sealed | In Stock | Bulk Orders AvailableThe ST3146855LW is a 146.8GB Ultra320 SCSI hard drive featuring 15,000 RPM spindle speed, 16MB cache, and 3.5ms average seek time in a 3.5" form factor. Built for mid-2000s enterprise storage systems, it is ideal for mission-critical servers, workstations, and RAID arrays requiring high IOPS performance. Compatible with Ultra320 SCSI controllers and systems supporting 68-pin LVD drives. Features perpendicular recording technology and Background Media Scan for enhanced data integrity during continuous 24x7 operations.
Specifications
  • Manufacturer: Seagate
  • Model: ST3146855LW
  • Capacity: 146.8GB
  • Interface: Ultra320 SCSI
  • Spindle Speed: 15,000 RPM
  • Cache: 16MB
  • Form Factor: 3.5" Low Profile
  • Seek Time: 3.5ms average
  • Latency: 2.0ms average
  • MTBF: 1,400,000 hours
  • Drive Type: Enterprise
  • Warranty: 90 days
Product Features
  • 15K RPM spindle speed for maximum IOPS
  • Ultra320 SCSI interface with 320MB/s transfer rate
  • 68-pin LVD connector for hot-swap compatibility
  • Perpendicular recording for 30% higher data density
  • Background Media Scan (BMS) for proactive error detection
  • Idle Read After Write (IRAW) data verification
  • 16MB buffer for enhanced throughput
  • Industry-leading 1.4 million hour MTBF
Compatibility

Compatible with Ultra320 SCSI controllers, enterprise servers, and workstations supporting 68-pin LVD drives. Not compatible with older Ultra2 Wide SCSI or single-ended SCSI systems without proper termination.
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.

146.8GB Ultra320 SCSI 15K RPM Enterprise Factory Sealed

Why the Cheetah 15K.5 is the right Enterprise Drive

The Cheetah 15K.5 represents Seagate's fifth-generation 15K RPM enterprise storage platform. Designed for demanding Tier 1 applications, it delivers 30% more IOPS than comparable 10K drives while maintaining enterprise-class reliability. This drive pioneered perpendicular recording technology in the 15K segment, enabling higher areal density and sustained transfer rates up to 125MB/s.

15K RPM Performance Leader

Delivers maximum I/O operations per second with 15,000 RPM spindle speed and 3.5ms average seek time. Enables fewer drives to meet performance requirements.

Ultra320 SCSI Interface

68-pin LVD connector provides 320MB/s theoretical bandwidth with hot-swap capability for mission-critical systems requiring zero downtime.

Enterprise Reliability Features

Background Media Scan and IRAW technology provide proactive error detection and data verification during idle time to prevent data loss.

Perpendicular Recording Technology

Advanced recording method increases areal density by 30% while delivering superior sustained transfer rates compared to longitudinal recording.

Brand New, Factory Sealed Stock

Available as new factory sealed units — ideal for IT professionals upgrading legacy enterprise systems requiring proven SCSI storage.

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.