Exos 20TB exact-model buying guide

Seagate Exos 20TB: X20 vs X22 vs X24 Models

Seagate Exos 20TB is a capacity class with multiple exact models, not one fixed specification. This page separates X20 / X22 / X24, SATA and SAS, security variants and current Amazon offers.

Exos specifications reviewed August 5, 2026 X16 through Exos M Generation, interface and model verification required

Quick answer

The 20TB capacity spans Exos X20, X22 and X24. ST20000NM002H is the current X24 SATA ISE reference, while ST20000NM007D and ST20000NM004E are older SATA models that may win on price. Compare the exact model and warranty.

Capacity20TBRaw decimal capacity per drive

Tracked generationsX20 / X22 / X24Exact models remain separate

RPM7,200Tracked enterprise models

Warranty class5 yearsVerify seller and region

Exact model data

Seagate Exos 20TB exact-model comparison

Capacity	Model	Generation	Interface	Sector format	Security	Recording	Cache	Max sustained	Status
20TB	`ST20000NM007D`	Exos X20	SATA	512e/4Kn FastFormat	Standard	CMR	256MB	285MB/s	Older generation
20TB	`ST20000NM004E`	Exos X22	SATA	512e/4Kn FastFormat	Standard	CMR	512MB	285MB/s	Older generation
20TB	`ST20000NM002H`	Exos X24	SATA	512e/4Kn FastFormat	ISE	CMR	512MB	285MB/s	Current channel generation
20TB	`ST20000NM001H`	Exos X24	SATA	512e/4Kn FastFormat	SED	CMR	512MB	285MB/s	Current channel generation
20TB	`ST20000NM007H`	Exos X24	SAS	512e/4Kn FastFormat	ISE	CMR	512MB	285MB/s	Current channel generation

Price, availability and condition can change. Confirm the model on the delivered label before adding it to an array.

Live catalogue

Current exact-model Exos 20TB offers

Only fresh, exact-model products returned by Amazon's new-condition search are eligible. Featured prices are shown when Amazon exposes them; products with no buy box are shown as buying options. Generation, interface, capacity, security class and exact model are enforced.

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Checking the current Cloudzat catalogue…

Interactive decision tool

Choose an Exos 20TB variant

Select the host interface, generation preference and security requirement to narrow the exact models.

Capacity (TB) Host interface Generation preference Security requirement Main priority

Three generations share 20TB

X20, X22 and X24 all have 20TB models, creating one of the most confusing Exos Amazon searches.

X20 uses 256MB cache on the tracked SATA model

ST20000NM007D is an established 20TB SATA model with published sustained speed up to 285MB/s.

X22 moved to 512MB cache

ST20000NM004E retains 20TB while moving to the X22 generation and a 512MB cache configuration.

X24 is the current CMR channel model

ST20000NM002H is the current SATA ISE reference. SED and SAS variants use different exact models.

Sector format must match the host

Selected Exos models support 512e and 4Kn FastFormat, but the current active format still has to be supported by the controller, operating system and storage appliance.

Security variants use different exact models

ISE and SED models should not be treated as interchangeable. Buy the exact capability required by the storage policy.

Enterprise cooling and acoustics

Plan for airflow, vibration isolation and spin-up power. A drive that works in a rack may be intrusive in a quiet room.

Use price per TB after compatibility

Compare only compatible new exact models on the Exos prices page. A cheaper SAS, recertified or wrong-generation listing is not an equivalent purchase.

How Cloudzat evaluates Exos drives

Cloudzat attaches generation, interface, sector format, security class, recording technology, cache, transfer rate and warranty only to an exact model. Exos X16, X18, X20, X22, X24 and Exos M remain separate, as do IronWolf Pro and WD Gold comparison products. This prevents a SATA listing from inheriting SAS specifications or an Exos M drive from inheriting X24 data.

Live offers are screened for new single internal 3.5-inch drives and matched to an exact model. SATA and SAS are kept separate. SSDs, external drives, accessories, enclosures, servers, multipacks, MACH.2, Exos Xz host-managed SMR, other drive families and non-new listings are rejected. Warranty source and delivered-label verification remain essential.

Frequently asked questions

Seagate Exos 20TB questions

Is every Exos 20TB drive the same?

No. The tracked 20TB models span X20 / X22 / X24 and may differ by SATA or SAS, security variant, cache and speed.

Can I use the SAS model in a SATA NAS?

No. A SAS drive needs a SAS-capable controller or backplane.

Can I mix generations in one array?

It may work when capacity, interface and sector format align, but matched models simplify performance and replacements.

Is a newer generation always faster?

No. Compare the exact published speed and workload. Newer may improve capacity or configuration rather than every metric.

Should I buy recertified to save money?

This page filters for new stock. Recertified drives need a separate warranty and risk comparison.

Where can I compare live price per TB?

Use Cloudzat’s existing Seagate Exos prices page after confirming the compatible exact model.

Primary sources

Cloudzat may earn a commission from qualifying purchases. Product availability, pricing and specifications can change. Confirm the exact Exos model, generation, interface, sector format, security variant, seller, condition and regional warranty route before buying.