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Silver 3.5 inch bare SATA hard drive with circuit board visible

Seagate

Seagate BarraCuda 7200.9 ST3500841AS 500GB 7200 RPM 8MB Cache SATA 3.0Gb/s 3.5" internal hard drive

SKU CH-KW3E-WT28A MPN ST3500841AS

A 500GB 3.5" desktop hard drive spinning at 7200 RPM with 8MB cache and a SATA 3.0Gb/s interface

  • PackagingBare Drive
  • InterfaceSATA 3.0Gb/s
  • Capacity500GB
  • RPM7200 RPM
  • Cache8MB
  • Average Seek Time11ms
  • 7200 RPM spindle speed for responsive desktop performance
  • 500 GB capacity stores large media libraries and backups
  • 8 MB cache buffers bursts for smoother multitasking
  • SATA 3.0 Gb/s interface connects to standard motherboard ports
  • 5 inch form factor fits typical desktop drive bays

Capacity and interface

The Seagate BarraCuda 7200.9 ST3500841AS is a 500GB 3.5-inch desktop hard drive with a SATA 3.0Gb/s interface. It suits users adding storage to an older system or replacing a failed drive in a legacy build.

Thermals and acoustics

The 7200 RPM spindle and 11ms average seek time produce typical mechanical noise and warmth for a drive of this class. Power draw follows standard 3.5-inch SATA patterns under normal desktop workloads.

Build and connectors

Supplied as a bare drive, it uses the standard SATA data and power connectors found on desktop motherboards and power supplies. The 3.5-inch form factor fits regular drive bays and mounting points without adapters. Not for buyers who need a 2.5-inch form factor or a larger cache buffer.

Highlights

  • 7200 RPM spindle speed for responsive desktop performance
  • 500 GB capacity stores large media libraries and backups
  • 8 MB cache buffers bursts for smoother multitasking
  • SATA 3.0 Gb/s interface connects to standard motherboard ports
  • 5 inch form factor fits typical desktop drive bays

Specifications

BrandSeagate
SeriesBarraCuda 7200.9
ModelST3500841AS
PackagingBare Drive
InterfaceSATA 3.0Gb/s
Capacity500GB
RPM7200 RPM
Cache8MB
Average Seek Time11ms
Form Factor3.5"
Shipping weight0.45 kg
Package size127 × 76 × 25 mm

Questions about this item

How do I install the 3.5" SATA 3.0Gb/s drive and what step is often missed?

Mount the drive in a 3.5" bay, connect the SATA data cable to the motherboard and the SATA power cable from the PSU, then ensure the SATA port is enabled in BIOS so the 500GB volume appears.

What maintenance or replacement will the ST3500841AS need over time?

No routine maintenance is required; keep the system dust-free for cooling, run occasional SMART checks, and replace the drive if reallocated sectors rise or seek errors exceed the 11ms average.

What limit appears first during sustained transfers on this 7200 RPM SATA 3.0Gb/s drive?

The 8MB cache fills quickly during long writes, so sustained throughput drops to the platter speed well before the SATA 3.0Gb/s interface saturates.

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