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Silver 3.5 inch bare SCSI hard drive with 68 pin connector

Seagate

Seagate Cheetah ST318453LW 18.4GB 15000 RPM 8MB Cache SCSI Ultra320 68pin 3.5" internal hard drive

SKU CH-YGY3-6YRF7 MPN ST318453LW

A 15000 RPM SCSI Ultra320 68-pin hard drive delivering 18.4 GB capacity with 8 MB cache and 3.6 ms average seek time

  • Total capacity18.4 GB
  • Interface typeSCSI Ultra320 68pin
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed15,000 RPM
  • Cache memory8 MB
  • 15000 RPM spindle speed cuts data-access latency
  • 6 ms average seek time accelerates random I/O
  • 8 MB cache buffers bursts for smoother throughput
  • SCSI Ultra320 68-pin interface delivers 320 MB/s bandwidth
  • 5-inch form factor fits standard drive bays

New 3.5" SCSI hard drive

This new Seagate Cheetah ST318453LW is an 18.4GB internal hard drive with a 3.5 inch form factor. It spins at 15000 RPM and provides an 8MB cache over a SCSI Ultra320 68pin interface. The bare drive is intended for desktop systems that support this specific connection type.

Compatibility and use cases

The drive suits users maintaining or repairing legacy servers or workstations requiring a SCSI Ultra320 68pin drive with 15000 RPM performance. Builders whose motherboards lack this specific SCSI interface cannot use this product. Buyers needing higher storage capacity or a different physical interface should look elsewhere.

Decisive specification

The SCSI Ultra320 68pin interface is the single specification that determines whether this drive fits the system. Some motherboards are not compatible with this SCSI interface. Verify the motherboard documentation for the correct 68pin connector before purchasing.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $166.99
Pricier than about 63% of the 4,938 comparable items (median $107.99).
Total capacity 18.4 GB
Lower than about 99% of the 2,372 comparable items (median 2 TB).

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Specifications

Product
Brand nameSeagate
Product lineCheetah
Model nameST318453LW
Total capacity18.4 GB
Performance
Rotational speed15,000 RPM
Average seek time3.6 ms
Mean write time4.0 ms
Mean latency2 ms
Storage
Cache memory8 MB
Ports & slots
Interface typeSCSI Ultra320 68pin
Size & build
Form factor3.5 in (8.89 cm)
Shipping weight1.36 kg
Package size178 × 140 × 38 mm

Questions about this item

How often will the 15000 RPM spindle motor need service or replacement?

The drive is sold new with a five-year limited warranty; the 15000 RPM motor is sealed inside the 3D Defense System enclosure and has no user-serviceable parts.

Which limit appears first during continuous SCSI Ultra320 68pin transfers — throughput or seek latency?

The interface runs at 320 MB/s, while average seek is 3.6 ms and latency is 2 ms, so mechanical response typically becomes the bottleneck before the bus saturates.

What heat and noise levels should I expect when the 15000 RPM Cheetah runs all day in a 3.5" bay?

The 15000 RPM spindle generates noticeable whine and measurable heat; plan for active airflow across the 3.5" frame and expect higher acoustics than slower desktop drives.

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