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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

  • PackagingBare Drive
  • InterfaceSCSI Ultra320 68pin
  • Capacity18.4GB
  • RPM15000 RPM
  • Cache8MB
  • Average Seek Time3.6ms
  • 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.

Highlights

  • 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

Specifications

BrandSeagate
SeriesCheetah
ModelST318453LW
PackagingBare Drive
InterfaceSCSI Ultra320 68pin
Capacity18.4GB
RPM15000 RPM
Cache8MB
Average Seek Time3.6ms
Average Write Time4.0ms
Average Latency2ms
FeaturesSome motherboards are not compatible with the SCSI interface. Please confirm which interface is appropriate for your system!
3D Defense System
Form Factor3.5"
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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