HDD – Hard Disk Drive

HDD is an abbreviation for Hard Disk Drive.

It is an electromechanical data storage device used to store digital data on rotating magnetic platters. It is a so-called non-volatile storage, meaning that data on it remains preserved even after power is disconnected.

In the context of IT and server management, HDDs still represent an important technology, although supplemented in some areas. Their main advantage is large storage capacity at a relatively low cost per gigabyte, which makes them ideal for:

Mass Data Storage: The primary choice for file servers (NAS/SAN), archiving solutions, or backup servers where terabytes to petabytes of data need to be stored.
Databases: For databases with a large volume of data where extreme access speed is not critical (e.g., analytical databases, logging servers).
Hybrid Systems: Often used in combination with faster SSD (Solid State Drive) disks, where SSDs serve for the operating system and frequently accessed data, while HDDs store less critical but voluminous data.

Key parameters of HDDs include capacity (in GB or TB), platter rotation speed (RPM, e.g., 7200 or 10000 for server drives), and interface type (most commonly SATA or SAS for servers). In server management, HDD reliability is critical, and therefore they are often deployed in RAID configurations to ensure redundancy and increase performance.