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The Workhorse of the Exos Lineup: 20TB of Capacity-Dense SAS Storage With Proven Reliability

The Seagate Exos X20 20TB sits at the sweet spot of the enterprise HDD market: large enough for capacity-dense deployments, proven enough to trust with production data, and priced well below the 24TB flagships. With 7,200 RPM, 12Gb/s SAS dual-port connectivity, 2.5 million hours MTBF, and a 550 TB/year workload rating, the X20 is the drive that powers backup repositories, object storage (MinIO, Cef), and nearline archive tiers across thousands of data centers. It is the drive you order when you need 300 TB of reliable, redundant storage without paying the density premium for 24TB drives.

Specifiche tecniche

Parametro	Specifica
Capacità	20tubercolosi (Anche: 14tubercolosi, 16tubercolosi, 18TB in X20 series)
Fattore di forma	3.5-pollici LFF
Interfaccia	SAS 12Gb/s (dual-port, full-duplex)
Velocità di rotazione	7,200 RPM
Recording Technology	CMR (Conventional Magnetic Recording) with TDMR (Two-Dimensional Magnetic Recording) heads
Cache Buffer	256 MB
Sustained Transfer Rate	Fino a 285 Mb/s
Average Latency	4.16 ms
MTBF	2,500,000 ore
AFR	0.35% (design target)
Workload Rate Limit	550 TB/year
URE Rate	1 sector per 10^15 bits
Energia (Oziare / Operativo)	4.8W / 7.0W
Sealing	Helium-sealed (HelioSeal)
RV Sensors	SÌ (Rotational Vibration sensor array)
Sector Size	512e or 4Kn (selectable)
Shock (Operativo / Non-Op)	40G / 200G
Physical	147.0 X 101.85 X 26.1 mm, 680G
Temperature	5C to 60C
Garanzia	5-anno limitato (produttore)

X20 vs X24 vs 2X18 — Choosing the Right Exos

Caratteristica	X20 20TB	X24 24TB	2X18 18TB (HAMR)
Capacità	20tubercolosi	24tubercolosi	18tubercolosi (dual-actuator, 2x 9TB)
Recording Tech	CMR + TDMR	CMR + TDMR	HAMR
Actuators	Single	Single	Dual (MACH.2)
Transfer Rate	285 Mb/s	270 Mb/s	288 Mb/s (dual ~570 MB/s)
Price per TB (relative)	100 percent	~95 percent	~105 percent
Best for	Proven capacity tier, backup, object storage	Maximum density per bay	High-throughput sequential workloads

Deployments Where the X20 Is the Right Drive

Backup repository (Veeam/Commvault): 12x X20 in RAID 6 = 200 TB usable. Sequential write at 285 MB/s per drive. UN 100 TB backup completes in the overnight window.
Object storage (MinIO, Cef): 24-drive node = 480 TB raw. Erasure coding (EC 8+4) delivers ~360 TB usable with strong fault tolerance. SAS dual-port adds path redundancy.
Nearline archive: Compliance archives, media libraries, and cold data tiers where cost per terabyte and 24/7 reliability matter more than IOPS.

Piattaforme compatibili

SAS 12Gb/s, compatible with all Dell PowerEdge servers with SAS backplanes (R660, R760, R770, R860, R960), xFusionFusionServer V7, Lenovo ThinkSystem. Works with PERC H730/H740/H750/H755/H965i, LSI/Broadcom 93xx/94xx/96xx SAS HBAs.