We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Silver 3.5 inch SAS hard drive with circuit board visible

Seagate

Seagate ST4000NM0125 4 TB 3.5" SAS 7200 RPM 128 MB internal hard drive

SKU CH-E9QJ-7MAWD

A 4 TB 3.5-inch SAS internal hard drive spinning at 7200 RPM with a 128 MB cache

  • Total capacity4 TB
  • Interface typeSAS 12Gb/s
  • Form factor3.5 in (8.89 cm)
  • Flash memory typeSLC
  • Rotational speed7,200 RPM
  • Cache memory128 MB
  • 4 TB capacity stores large datasets
  • 7200 RPM spindle delivers fast sequential throughput
  • 128 MB cache buffers heavy write workloads
  • SAS 12Gb/s interface supports dual-port redundancy
  • 5 inch form factor fits standard drive bays

Enterprise Capacity Drive

The Seagate ST4000NM0125 is a 4TB 3.5-inch internal hard drive built for servers and storage arrays that require the SAS 12Gb/s interface. It spins at 7200 RPM with a 128MB cache to sustain heavy read and write workloads. The SLC NAND flash component supports data integrity features in demanding environments. This drive suits administrators who need high-capacity, enterprise-grade storage on a 12Gb/s SAS fabric.

Not For Direct Desktop Use

Systems without a SAS host bus adapter or backplane cannot connect this drive, so standard PC builders should look elsewhere. Laptop upgrades and small-form-factor enclosures are unsuitable due to the 3.5-inch form factor. Buyers who need a different interface protocol or a smaller physical size must choose another product.

Interface Is SAS 12Gb/s

The single specification that determines compatibility is the SAS 12Gb/s interface, which requires a matching controller or backplane. Without that connection the drive will not function in the target system. Verify the host hardware supports this interface before purchase.

How it compares

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

Price $122.99
Typical for this category: the median of 4,938 items is $107.99.
Total capacity 4 TB
Higher than about 70% of the 2,372 comparable items (median 2 TB).
Price per TB $30.75 per TB
Cheaper than about 82% of the 2,365 comparable items (median $62.21 per TB).

New to this? Paying with USDT: TRC-20 or ERC-20 — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameSeagate
Model nameST4000NM0125
Total capacity4 TB
Performance
Rotational speed7,200 RPM
Storage
Flash memory typeSLC
Cache memory128 MB
Ports & slots
Interface typeSAS 12Gb/s
Size & build
Form factor3.5 in (8.89 cm)

Questions about this item

How much heat and noise does the ST4000NM0125 produce during continuous 7200 RPM operation?

The 3.5-inch drive spins at 7200 RPM with a SAS 12Gb/s interface; sustained enterprise workloads generate typical mechanical-drive heat and audible seek noise.

What host connector and controller does the ST4000NM0125 require to function?

It needs a 12 Gb/s SAS backplane or HBA with a compatible SAS cable; the drive uses a standard SAS data and power connector.

Can the ST4000NM0125 share a SAS backplane with older 6 Gb/s SAS drives?

Yes, the 12 Gb/s SAS interface auto-negotiates down to 6 Gb/s, so the 4 TB drive operates alongside legacy SAS devices on the same domain.

More in 3.5-Inch Internal Desktop HDDs

Similar items