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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. С 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, Ceph), 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.

Технические характеристики

Параметр	Спецификация
Емкость	20ТБ (также: 14ТБ, 16ТБ, 18TB in X20 series)
Фактор формы	3.5-дюйм LFF
Интерфейс	SAS 12 Гбит/с (dual-port, full-duplex)
Скорость вращения	7,200 Rpm
Recording Technology	CMR (Conventional Magnetic Recording) with TDMR (Two-Dimensional Magnetic Recording) heads
Cache Buffer	256 МБ
Sustained Transfer Rate	Вплоть до 285 МБ/с
Average Latency	4.16 ms
Среднее время безотказной работы	2,500,000 часы
АФР	0.35% (design target)
Workload Rate Limit	550 TB/year
URE Rate	1 sector per 10^15 bits
Власть (Праздный / Операционная)	4.8Вт / 7.0Вт
Sealing	Helium-sealed (HelioSeal)
RV Sensors	Да (Rotational Vibration sensor array)
Размер сектора	512e or 4Kn (selectable)
Шок (Операционная / Non-Op)	40г / 200г
Физический	147.0 Икс 101.85 Икс 26.1 мм, 680г
Температура	5C to 60C
Гарантия	5-ограничено годом (производитель)

X20 vs X24 vs 2X18 — Choosing the Right Exos

Особенность	X20 20TB	X24 24TB	2X18 18TB (HAMR)
Емкость	20ТБ	24ТБ	18ТБ (dual-actuator, 2x 9TB)
Recording Tech	CMR + TDMR	CMR + TDMR	HAMR
Actuators	Single	Single	Dual (MACH.2)
Transfer Rate	285 МБ/с	270 МБ/с	288 МБ/с (dual ~570 MB/s)
Price per TB (relative)	100 процент	~95 percent	~105 percent
Лучшее для	Proven capacity tier, резервная копия, 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. А 100 TB backup completes in the overnight window.
Object storage (MinIO, Ceph): 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.

Совместимые платформы

SAS 12 Гбит/с, compatible with all Dell PowerEdge servers with SAS backplanes (660 рэндов, 760 рэндов, 770 рэндов, 860 рэндов, 960 рэндов), xFusion FusionServer V7, Lenovo ThinkSystem. Works with PERC H730/H740/H750/H755/H965i, LSI/Broadcom 93xx/94xx/96xx SAS HBAs.