Seagate Exos X14 12TB (ST12000NM0008): features, specs and who it suits

The Seagate Exos X14 ST12000NM0008 is a 12 TB, 3.5-inch internal hard drive with a SATA 6 Gb/s interface. It belongs to Seagate's enterprise range, aimed at servers, network storage and archives where a lot of data needs to sit on a single drive. Here is what the main specifications mean in practice.

Capacity and the spinning-disk design

At 12 TB, one drive holds what would take several smaller disks. The drive spins at 7200 RPM and has a 256 MB cache. Seagate lists an average latency of 4.16 ms, which is the typical time for the platter to bring the requested data under the head after the head is in position.

Hard drives are still a common choice for bulk storage because they hold a lot of data per drive. Solid-state drives are faster, but spinning disks suit archives, backups and recorded footage, where capacity matters more than instant access.

Helium sealing

The Exos X14 uses a helium-sealed design. Helium is much less dense than air, so, in general, there is less turbulence inside the drive. That typically allows more platters to fit in the same case and can reduce power draw and vibration. The drive's weight is listed as 1.521 lb (690 g).

Speed in real terms

Seagate lists maximum sustained transfer rates of 261 and 249 MB/s (the two figures given in its specification), and random performance at 4K queue depth 16 of 170 IOPS for reads and 418 IOPS for writes with write cache disabled. Sustained rates apply to large sequential files, such as copying a big backup. Small random reads are where any spinning disk is slowest, which is why drives like this are normally used for storage rather than as a system drive.

Enterprise features

Seagate describes the drive as having:

• FastFormat (512e/4Kn): the standard model supports both common sector formats. Check which one your system or controller needs.
• PowerBalance: a feature Seagate says optimizes IOPS per watt.
• Reliability figure: a 2.5 million hour MTBF. MTBF is a statistical figure across a large population of drives, not a promise about one drive, and it's best read alongside backups rather than in place of them.

Seagate suggests business-critical applications, enterprise data archiving and surveillance storage as typical uses.

Power, heat and physical details

The listing gives an average idle power of 5.0 W, and a maximum operating figure of 10.0 W. The drive needs +12V and +5V from the power supply. Its stated operating temperature range is 5 to 60 degrees Celsius, so airflow in the case or rack matters. For shock, it lists 70 G operating (read) and 250 G non-operating, both for 2 ms. Dimensions are about 4.01 x 5.787 x 1.028 inches (101.85 x 147 x 26.11 mm).

Who it suits

It fits people building a home or small-office file server, a network-attached storage unit, a surveillance recorder or a backup archive who want large capacity per bay. It's less suited to a laptop or a boot drive.

What to check before you buy

• Bay and connector: it's a 3.5-inch SATA drive, so confirm your case, NAS or server has a free bay and a SATA port or backplane.
• Sector format: confirm your operating system or controller works with the 512e/4Kn format.
• Noise and heat: enterprise drives are typically louder than desktop drives. Check where it will sit.
• Compatibility lists: some NAS and server makers publish lists of approved drives.
• Backups: one drive is still one point of failure. Plan a backup or a redundant array.
• Warranty: check the terms with the seller and the manufacturer.

The short version

• 12 TB, 3.5-inch SATA 6 Gb/s hard drive, 7200 RPM with a 256 MB cache.
• Helium-sealed design with PowerBalance and 512e/4Kn FastFormat support.
• Sustained transfer rates of 261 and 249 MB/s; 2.5 million hour MTBF figure.
• Aimed at servers, archives and surveillance storage.
• Needs a 3.5-inch bay, good airflow and a backup plan.

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