Seagate Cheetah 18XL ST318404LC 18.4GB Ultra160 SCSI front view Seagate Cheetah 18XL ST318404LC 18.4GB Ultra160 SCSI front view
Seagate Cheetah 18XL ST318404LC 18.4GB Ultra160 SCSI front view Seagate Cheetah 18XL ST318404LC 18.4GB Ultra160 SCSI front view
Seagate ST318404LC 80-pin SCA-2 connector top view Seagate ST318404LC 80-pin SCA-2 connector top view
Seagate Cheetah 18XL drive label angled view Seagate Cheetah 18XL drive label angled view
Seagate ST318404LC enterprise SCSI hard drive specifications label Seagate ST318404LC enterprise SCSI hard drive specifications label
Seagate ST318404LC enterprise SCSI hard drive specifications label Seagate ST318404LC enterprise SCSI hard drive specifications label
Seagate Cheetah 18XL ST318404LC 18.4GB Ultra160 SCSI front view
Seagate Cheetah 18XL ST318404LC 18.4GB Ultra160 SCSI front view
Seagate ST318404LC 80-pin SCA-2 connector top view
Seagate Cheetah 18XL drive label angled view
Seagate ST318404LC enterprise SCSI hard drive specifications label
Seagate ST318404LC enterprise SCSI hard drive specifications label

Seagate

Seagate Cheetah 18XL ST318404LC – 18.4GB Ultra160 SCSI | 80-Pin SCA-2 | 10,000 RPM | 3.5" LP | Server HDD

$225.00

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

The ST318404LC is an 18.4GB Ultra160 SCSI hard drive featuring 10,000 RPM spindle speed, 4-8MB cache buffer, 3.6ms average seek time in a 3.5" low profile form factor. Built for late 1990s and early 2000s enterprise SCSI systems, it is ideal for server applications, high-performance workstations, and RAID arrays requiring ultra-fast access times. Compatible with Ultra160 SCSI controllers, SCSI-2 and SCSI-3 systems with 80-pin SCA-2 hot-swap connectors. Features Giant Magnetoresistive (GMR) heads and PRML 16/17 EPR4 recording technology for exceptional data integrity and continuous operation reliability.

All products from Anand International ship brand new and factory sealed. Volume and B2B pricing available for qualified buyers.
Specifications
  • Manufacturer: Seagate
  • Model: ST318404LC
  • Capacity: 18.4GB (18.351GB formatted)
  • Interface: Ultra160 SCSI 80-Pin SCA-2
  • Spindle Speed: 10,000 RPM
  • Cache: 4-8MB Buffer
  • Form Factor: 3.5" Low Profile (1.0")
  • Average Seek Time: 3.6ms
  • Rotational Latency: 3.0ms
  • MTBF: 1,000,000 hours
  • Drive Type: Enterprise Server
  • Warranty: 90 days
  • Shipping: Free domestic US shipping
  • Condition: Brand New, Factory Sealed
Product Features
  • Ultra160 SCSI interface with 160MB/s burst transfer rate
  • 80-Pin SCA-2 hot-swap connector for server compatibility
  • Giant Magnetoresistive (GMR) heads for enhanced data recovery
  • PRML 16/17 EPR4 recording technology
  • Rotary voice coil actuator with straight-arm design
  • Low voltage differential (LVD) and single-ended (SE) support
  • Zoned bit recording (ZBR) for optimized capacity
  • Dedicated head landing zone for data protection
  • Direct replacement for legacy systems requiring SCSI connectivity
  • 90-day Anand International warranty on all legacy stock
  • Free domestic US shipping included
  • Volume and B2B pricing available for qualified buyers
Compatibility

Compatible with Ultra160 SCSI controllers, SCSI-2 and SCSI-3 systems, enterprise servers with 80-pin SCA-2 connectors, RAID enclosures, and high-performance workstations from the late 1990s to early 2000s. Not compatible with modern SATA or SAS systems, IDE/PATA interfaces, or systems requiring 68-pin narrow SCSI connections.
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.

18.4GB Ultra160 SCSI 10,000 RPM 3.6ms Seek Factory Sealed

Why the Cheetah 18XL is the right enterprise SCSI drive

The Seagate Cheetah 18XL represents the pinnacle of late 1990s enterprise SCSI technology, offering exceptional performance with its 10,000 RPM spindle speed and Ultra160 interface. This generation introduced hot-swap SCA-2 connectivity and advanced GMR head technology for superior data integrity. Originally designed for mission-critical server environments, it delivers the ultra-fast access times and reliability that made it the gold standard for enterprise storage before the SAS era.

Ultra160 SCSI Performance

Delivers 160MB/s burst transfer rates through advanced Ultra160 SCSI interface with LVD signaling. Perfect for high-throughput server applications requiring maximum SCSI bandwidth.

10,000 RPM Enterprise Speed

High-speed spindle provides 3.6ms average seek time and 3.0ms rotational latency. Optimized for enterprise workloads demanding ultra-fast random access performance.

SCA-2 Hot-Swap Ready

80-pin SCA-2 connector enables hot-swap capability in compatible server enclosures. Reduces downtime during drive maintenance in mission-critical environments.

GMR Head Technology

Giant Magnetoresistive heads with PRML recording deliver exceptional data integrity and error recovery. Advanced technology provides reliable operation in demanding enterprise conditions.

New Old Stock with 90-Day Warranty

Available as brand new, factory sealed old stock units from Anand International with a 90-day warranty. Ideal for legacy system maintenance, vintage computing restoration, and hard-to-find replacement needs.

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.