The choice of storage determines the performance and reliability of a server. Between HDD and SSD, SAS, SATA, or NVMe interfaces, enterprise or consumer drives, internal storage or storage arrays… the options are numerous. This guide helps you choose the right drives based on your needs — and save money with tested used equipment.
HDD or SSD: the first decision
The hard disk drive (HDD) offers large capacity at a low cost, ideal for archiving and storing large volumes. The SSD (flash memory) is much faster (latency and IOPS), perfect for systems, databases, and virtual machines. The trend: SSD for performance, HDD for cost-effective capacity — often both together.
SAS, SATA, NVMe: which interfaces?
- SATA: consumer/entry-level server interface, economical, perfect for capacity.
- SAS: robust server interface, faster and more durable, designed for intensive 24/7 operation and dual attachment.
- NVMe: high-performance SSD connected via PCIe, minimal latency — for the most demanding workloads.
There is also NL-SAS: high-capacity drives with SAS interface, a good balance of capacity and reliability.
Enterprise vs consumer drives: why it matters
A server drive is not a PC drive: it is designed to run continuously, supported by firmware adapted for RAID, with higher endurance (TBW for SSDs) and reliability rates (MTBF). For a server, always prioritize enterprise-class drives.
Capacity, speed, endurance: the right criteria
- Capacity: sized according to your data plus RAID overhead.
- Speed: for an HDD, the RPM (7,200, 10,000, or 15,000 rpm); for an SSD, the IOPS and throughput.
- Endurance (SSD): TBW/DWPD indicates how many writes the drive can handle — crucial for databases.
- Form factor: 2.5” or 3.5”, compatible with your server’s hot-swap bays.
Internal storage, NAS, or SAN?
Internal storage (drives inside the server) meets most needs. NAS centralizes files on the network, easy to share. SAN (block storage array) is aimed at demanding virtualized infrastructures. To pool large volumes, see our storage arrays and NAS.
Combining technologies and RAID
In practice, SSDs (system, VM, cache) and HDDs (data, archives) are often mixed, all protected by an appropriate RAID level (1, 5, 6, or 10). Essential reminder: RAID protects against a single drive failure but does not replace a backup (consider an external copy or LTO tape). For details on RAID levels, see our guide choosing the right server.
Used storage: what to check
Tested used drives and SSDs allow you to equip or expand a server at a lower cost. Check health status (SMART), operating hours, and for SSDs, remaining wear. Every drive we offer is inspected and guaranteed. Discover our hard drives, SSDs, and NAS storage, and related server components (RAID controllers, caddies…).
FAQ: server storage
SAS or SATA for a server?
SAS for intensive workloads and maximum reliability; SATA (or NL-SAS) to prioritize capacity at a lower cost. Many servers combine both.
Are SSDs always necessary?
Not always. SSDs speed up the system, VMs, and databases; for archiving or large volumes, HDDs remain more economical. The ideal is often a mix.
Can you put a PC drive in a server?
It is not recommended: a consumer drive lacks the endurance, RAID firmware, and reliability expected from a continuously running server.
Is RAID enough to protect my data?
No. RAID handles hardware failure of a drive but does not protect against deletion, ransomware, or disasters. A true backup remains essential.
In summary
Choosing server storage means balancing capacity (HDD), performance (SSD/NVMe), and reliability (SAS interface, enterprise class), then protecting everything with appropriate RAID — without forgetting backups. With tested and inspected used equipment, you expand your storage at a controlled cost.