HDD vs NVMe SSD for Servers: Which to Choose in India?
Compare HDD and NVMe SSD storage for server deployments. Sequential read speed, IOPS, latency, and cost per TB analysis for Indian data centres.
| Spec | Enterprise HDD (e.g., Seagate Exos X20 20TB) | Enterprise NVMe SSD (e.g., Samsung PM9A3 3.84TB) |
|---|---|---|
| sequential read | 272 MB/s | 6,900 MB/s |
| random iops | Up to 170 IOPS (read) | Up to 1,000,000 IOPS (read) |
| latency | 4-8 ms average seek time | 70-100 microseconds |
| cost per tb | INR 2,500-4,000 per TB | INR 8,000-15,000 per TB |
| endurance | 550 TB/year workload rating; 2.5M hours MTBF | 1 DWPD (3 years); 2.5M hours MTBF |
Best for Performance
Enterprise NVMe SSD (e.g., Samsung PM9A3 3.84TB)
Best for Value
Enterprise HDD (e.g., Seagate Exos X20 20TB)
Choose Enterprise HDD (e.g., Seagate Exos X20 20TB) if...
You need bulk storage for backups, archives, media libraries, or data lakes where capacity matters more than speed. HDDs offer 3-5x lower cost per TB, making them ideal for storing large datasets, surveillance footage, or cold data. Use HDDs behind a caching layer for best results.
Choose Enterprise NVMe SSD (e.g., Samsung PM9A3 3.84TB) if...
Your workload requires low latency and high IOPS. Databases (PostgreSQL, MySQL, MongoDB), virtualisation (VM boot drives), AI training data pipelines, or any application where storage is a bottleneck. NVMe SSDs deliver 25x the throughput and 5,000x the IOPS of HDDs.
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Frequently Asked Questions
Should I use NVMe for AI training data in India?
Yes, for the active training dataset. NVMe storage prevents the GPU from starving for data, especially during large-scale training with fast data loading. However, the full dataset can reside on HDD-based storage (NAS/SAN) and be staged to NVMe before training runs.
Is a hybrid HDD + NVMe approach viable?
Absolutely. A common approach is NVMe for the boot drive and hot data (databases, active datasets), with HDD arrays for bulk storage, backups, and cold data. This balances performance and cost effectively. Most enterprise servers in India use this hybrid architecture.
How do power costs compare for HDD vs NVMe in Indian data centres?
Enterprise HDDs consume 5-10W each, while NVMe SSDs consume 5-25W depending on workload. However, NVMe requires far fewer drives for equivalent IOPS. A single NVMe SSD can replace dozens of HDDs for IOPS-heavy workloads, resulting in lower overall power, cooling, and rack space costs.