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Silver rectangular 3.5 inch bare hard drive with green circuit board visible

Western Digital

Western Digital RE2 WD4001ABYS 400GB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" internal hard drive

SKU CH-X2KV-P87YA MPN WD4001ABYS

A 400GB 7200 RPM SATA desktop drive with 16MB cache and 8.9ms seek time

  • Total capacity400 GB
  • Interface typeSATA 3.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed7,200 RPM
  • Cache memory16 MB
  • 7200 RPM spindle speed delivers responsive desktop performance
  • 16 MB cache buffers bursts for smoother multitasking
  • SATA 3.0 Gb/s interface provides broad motherboard compatibility
  • 400 GB capacity stores operating system and core applications
  • 9 ms average seek time enables quick data access

RE2 series desktop storage

The Western Digital RE2 WD4001ABYS is a 400GB 3.5-inch internal hard drive built for desktop systems. It connects via a SATA 3.0Gb/s interface and spins at 7200 RPM with a 16MB cache. This bare drive suits users adding primary or secondary storage to a compatible motherboard.

Sustained 7200 RPM operation

Under continuous workloads the spindle holds a steady 7200 RPM while the 16MB buffer absorbs write bursts. Average seek and write times of 8.9ms keep latency predictable during long file transfers or backup jobs. The SATA 3.0Gb/s link provides consistent throughput without the thermal throttling seen on smaller high-speed drives.

Upgrade from lower-capacity desktop drives

The 400GB capacity replaces smaller 3.5-inch SATA drives when more space is needed for applications and archives. The jump is worthwhile when the existing drive is full or its cache is below 16MB. Buyers who need higher areal density or a newer interface should look elsewhere.

How it compares

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

Price $48.99
Cheaper than about 78% of the 4,938 comparable items (median $107.99).
Total capacity 400 GB
Lower than about 84% of the 2,372 comparable items (median 2 TB).
Price per TB $122.48 per TB
Pricier than about 68% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWestern Digital
Product lineRE2
Model nameWD4001ABYS
Total capacity400 GB
Performance
Rotational speed7,200 RPM
Average seek time8.9 ms
Mean write time8.9 ms
Storage
Cache memory16 MB
Ports & slots
Interface typeSATA 3.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Shipping weight0.68 kg
Package size203 × 152 × 51 mm

Questions about this item

How much heat and power does the 7200 RPM RE2 drive produce when running continuously?

The WD4001ABYS spins at 7200 RPM with a SATA 3.0Gb/s interface; sustained operation will generate typical 3.5-inch mechanical-drive heat and draw standard SATA power levels.

What motherboard connector and cable do I need to install this SATA 3.0Gb/s bare drive?

You need a free SATA data port on the motherboard or controller, a SATA data cable, and a SATA power connector from the power supply.

Will this 400GB RE2 drive work alongside an older SATA 1.5Gb/s drive on the same controller?

Yes, the SATA 3.0Gb/s interface is backward compatible, so it will operate at the slower 1.5Gb/s speed when paired with an older drive on the same controller.

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