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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, 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.
المواصفات الفنية
| معامل | تخصيص |
|---|---|
| سعة | 20تيرابايت (also: 14تيرابايت, 16تيرابايت, 18TB in X20 series) |
| عامل الشكل | 3.5-بوصة LFF |
| واجهة | SAS 12 جيجابت / ثانية (dual-port, full-duplex) |
| سرعة الدوران | 7,200 RPM |
| Recording Technology | CMR (Conventional Magnetic Recording) with TDMR (Two-Dimensional Magnetic Recording) heads |
| Cache Buffer | 256 MB |
| Sustained Transfer Rate | يصل إلى 285 ميغابايت/ق |
| Average Latency | 4.16 ms |
| MTBF | 2,500,000 ساعات |
| AFR | 0.35% (design target) |
| Workload Rate Limit | 550 TB/year |
| URE Rate | 1 sector per 10^15 bits |
| قوة (Idle / التشغيل) | 4.8دبليو / 7.0دبليو |
| Sealing | Helium-sealed (HelioSeal) |
| RV Sensors | Yes (Rotational Vibration sensor array) |
| Sector Size | 512e or 4Kn (selectable) |
| صدمة (التشغيل / Non-Op) | 40جي / 200جي |
| Physical | 147.0 x 101.85 x 26.1 مم, 680g |
| درجة حرارة | 5C to 60C |
| ضمان | 5-year limited (manufacturer) |
X20 vs X24 vs 2X18 — Choosing the Right Exos
| ميزة | X20 20TB | X24 24TB | 2X18 18TB (HAMR) |
|---|---|---|---|
| سعة | 20تيرابايت | 24تيرابايت | 18تيرابايت (dual-actuator, 2x 9TB) |
| Recording Tech | CMR + TDMR | CMR + TDMR | HAMR |
| Actuators | Single | Single | Dual (MACH.2) |
| Transfer Rate | 285 ميغابايت/ق | 270 ميغابايت/ق | 288 ميغابايت/ق (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. أ 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.
Compatible Platforms
SAS 12 جيجابت / ثانية, compatible with all Dell PowerEdge servers with SAS backplanes (R660, R760, R770, R860, R960), xFusion FusionServer V7, Lenovo ThinkSystem. Works with PERC H730/H740/H750/H755/H965i, LSI/Broadcom 93xx/94xx/96xx SAS HBAs.
Source Through Xincuan
We supply Exos X20 drives with factory-direct pricing, 3-year warranty, and global shipping. Volume discounts for 20+ محركات.
