Seagate has up to date their flagship capability choices for the retail HDD market with the provision announcement for 2 new exhausting drives immediately – the Exos X20 and IronWolf Professional 20TB. These two fashions be part of the recently-released Western Digital WD Gold 20TB and Ultrastar HC560 to spherical out the 20TB exhausting drives at present accessible for retail buy.


The Exos X20 comes with SATA in addition to SAS 12Gbps interface choices, and contains SED (self-encrypting drive) fashions whereas the IronWolf Professional is SATA-only (much like earlier generations). The Exos X20 has a workload score of 550 TB/yr, whereas the IronWolf Professional model is rated for 300 TB/yr. An in depth comparative abstract of the completely different specs of the 2 new drives and the way they stack up towards the Western Digital choices is supplied within the desk under. Solely the SATA choices of the Exos X20 and the Ultrastar HC560 are being thought-about for this objective. The 2 mannequin numbers corresponding to those are for the SED and non-SED (commonplace) choices.

2021 Retail 20TB HDDs – Comparative Specs

Exos X20 20TB

IronWolf Professional 20TB
Western Digital

WD Gold 20TB
Western Digital

Ultrastar HC560
Mannequin ST20000NM007D

ST20000NM000D (SED)
ST20000NE000 WD201KRYZ WUH722020ALE6L1 (SED)

Recording Know-how Standard Magnetic Recording

Standard Magnetic Recording with Power-Help

RPM 7200 RPM
DRAM Cache 256 MB 512 MB
Helium-Filling Sure
Sequential Information Switch Charge

285 MB/s 269 MB/s
MTBF 2.5 M 1.2 M 2.5 M
Rated Annual Workload 550 TB 300 TB 550 TB
Acoustics Idle 28 dB 20 dB
Search 30 dB 32 dB 36 dB
Energy Consumption Random learn/write 9.4 W / 8.9 W (100R/100W @ QD16) 9.4 W / 8.9 W (100R/100W @ QD16) 7 W

(50R/50W @ QD1)
Idle 5.5 W 5.4 W 6 W
Guarantee 5 Years 5 Years

(3 years DRS)
5 Years
Pricing $670 $650 $680 $700

The IronWolf Professional mannequin additionally has a 1W standby / sleep-mode energy consumption score that might show helpful in NAS models which can be topic to fixed 24×7 site visitors. The idle acoustics are on the increased finish for the Seagate fashions, however the search numbers make up for it. Sadly, we shouldn’t have a technique to evaluate the ability consumption numbers based mostly on the datasheets, because the workloads used for the characterization are completely different between the 2 distributors. That stated, the idle numbers lean once more in direction of the Seagate fashions.

It should be famous right here that the listing value premium for the WD fashions will be accounted for by way of OptiNAND know-how within the WD Gold and Ultrastar HC560. We reached out to Seagate on using HAMR within the new fashions, and surprisingly, Seagate indicated that the 2 new exhausting drives being launched to retail immediately don’t use heat-assisted magnetic recording.


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