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Silver 3.5 inch SAS hard drive with exposed circuit board

DELL

DELL 400-ALQD 4TB 3.5" SAS 7200 RPM internal hard drive

SKU CH-9ZHN-SFA3S

4 TB internal hard drive with 7200 RPM SAS 12Gb/s interface in 3.5 inch form factor

  • Total capacity4 TB
  • Interface typeSAS 12Gb/s
  • Form factor3.5 in (8.89 cm)
  • Rotational speed7,200 RPM
  • 4 TB capacity stores large datasets
  • 7200 RPM spindle speed delivers fast data access
  • SAS 12Gb/s interface enables high-throughput connectivity
  • 5-inch form factor fits standard drive bays
  • Hot-swap support allows drive replacement without downtime

Capacity and interface

This 4 TB drive uses a 12 Gb/s SAS connection in a 3.5 inch form factor. It is designed for internal desktop or server storage where high throughput and reliable data handling are required.

Thermals noise and power

The 7200 RPM spindle speed delivers consistent performance for near-line workloads. Power draw and acoustic output remain typical for enterprise-class SAS drives operating under normal desktop or rack conditions.

Build fit and requirements

The drive fits standard 3.5 inch internal bays and connects directly to a SAS controller or backplane. Hot-swap support allows removal without powering down the system when the chassis and controller permit it.

How it compares

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

Price $292.99
Pricier than about 82% of the 4,938 comparable items (median $107.99).
Total capacity 4 TB
Higher than about 70% of the 2,372 comparable items (median 2 TB).
Price per TB $73.25 per TB
Pricier than about 55% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameDell
Model name400-ALQD
Total capacity4 TB
Performance
Rotational speed7,200 RPM
Ports & slots
Interface typeSAS 12Gb/s
Size & build
Form factor3.5 in (8.89 cm)

Questions about this item

How do I install the 400-ALQD in a SAS backplane and what step is often missed?

Slide the 3.5" drive into the hot-swap carrier until the SAS connector seats firmly, then lock the lever; the step most people skip is verifying the backplane runs at 12Gb/s so the 7200 RPM platters can deliver full throughput

What maintenance or replacement will the 400-ALQD need later?

No scheduled maintenance is required; replace the unit only if SMART attributes report reallocated sectors or the 4TB capacity becomes insufficient for the workload

What limit appears first on the 400-ALQD during sustained writes?

The 12Gb/s SAS interface and 7200 RPM spindle cap sequential throughput, so sustained writes will hit the interface bandwidth ceiling before thermal throttling engages

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