Platter Hard Drives (HDD) vs Solid State Drives (SSD)

  • HDD
  • Lagacy type of storage device using set of magnetic platters and mechanical parts to store and retrieve data. This mechanism limits both throughput of the drive but also to much higher degree seek (response) time greatly increasing latency (esp. important for the Databases).
  • < 500 IOPS
  • < 200 MB/s
  • Contains moving parts (fragile)
  • SSD
  • Newer technology based purely on electronics (memory chips). This allows way better response time - which turns into ability to provide few orders of magnitude larger number of I/O operations per second. Also use of Enterprise Class devices ensures good durability of the disks.
  • > 75 000 IOPS
  • > 500 MB/s
  • No moving parts (more durable)

Why Solid State Drives?

Low latency

SSD drives have way better access time which mean also lower latency than legacy magnetic drives

Fast transfers

Both read as well as write speed is also considerably faster for the solid state drives.


Lack of moving parts prevents mechanical failures, high quality drives provide required endurance.

DBs Friendly

Above features makes SSDs perfect especially for IO-intensive tasks such as database servers.

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