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Silver 3.5 inch bare SCSI hard drive with 68 pin connector

Seagate

Seagate Cheetah 15K.5 ST3146855LW 147GB 15000 RPM 16MB Cache SCSI Ultra320 68pin 3.5" internal hard drive

SKU CH-1D1K-T9BER MPN ST3146855LW

A 15000 RPM 147GB 3.5-inch SCSI Ultra320 hard drive with 16MB cache and 2ms latency for enterprise servers

  • Total capacity147 GB
  • Interface typeSCSI Ultra320 68pin
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed15,000 RPM
  • Cache memory16 MB
  • 15000 RPM spindle speed accelerates data access
  • 16 MB cache buffers bursts for smoother throughput
  • SCSI Ultra320 68-pin interface delivers 320 MB/s bandwidth
  • 147 GB capacity stores critical datasets in a 3.5-inch bay
  • Perpendicular recording technology enables the high areal density

Enterprise Storage Drive

The Seagate Cheetah 15K.5 ST3146855LW is a 3.5 inch internal hard drive built for enterprise servers and storage arrays that require a SCSI Ultra320 68pin connection. It delivers 147GB of capacity at 15000 RPM with a 16MB cache. This new bare drive suits administrators maintaining legacy infrastructure or expanding existing SCSI-based RAID sets.

Interface Compatibility

The single specification that determines fit is the SCSI Ultra320 68pin interface; the drive will only work with controllers and backplanes that provide this exact connector and signalling standard. A 2ms average latency and perpendicular recording technology support the 15000 RPM spindle speed. No other interface or form factor is supported by this model.

Installation Notes

Installation requires a 3.5 inch drive bay and a compatible 68pin SCSI cable with proper termination on the bus. The bare drive ships without mounting rails, cables or termination blocks, so installers must supply these parts. A common issue is mismatched SCSI IDs or missing termination, which prevents the drive from being detected by the controller.

How it compares

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

Price $185.99
Pricier than about 66% of the 4,938 comparable items (median $107.99).
Total capacity 147 GB
Lower than about 94% of the 2,372 comparable items (median 2 TB).
Price per TB $1,265.24 per TB
Pricier than about 90% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineCheetah 15K.5
Model nameST3146855LW
Total capacity147 GB
Performance
Rotational speed15,000 RPM
Mean latency2 ms
Storage
Cache memory16 MB
Ports & slots
Interface typeSCSI Ultra320 68pin
Size & build
Form factor3.5 in (8.89 cm)
Shipping weight0.68 kg
Package size203 × 152 × 51 mm

Questions about this item

How does the 15000 RPM spindle speed affect real-world access times?

The 15000 RPM rotation yields an average latency of 2ms, so the drive can locate data much faster than slower desktop drives.

What practical throughput does the SCSI Ultra320 68-pin interface deliver?

The Ultra320 interface supports a maximum burst transfer rate of 320 MB/s, though sustained speeds depend on the controller and workload.

Will this 3.5-inch bare drive fit a standard desktop drive bay?

Yes, it uses the standard 3.5-inch form factor and mounts with ordinary screws in any compatible bay.

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