Western Digital WD Ultrastar DC HC560 20TB HDD

Descripción

Condition: New
We offer two models: SATA (6 Gb/s) and SAS (12 Gb/s), which share the following features:
Capacity: 20 TB.
Rotational Speed: 7,200 RPM.
Data Buffer (Cache): 512 MB.
Writing Technology: EAMR (Energy-Assisted Magnetic Recording) and CMR.
Architecture: OptiNAND technology, which integrates iNAND flash memory to improve performance and density.
Design: 7th generation HelioSeal (helium-filled) for greater efficiency.
MTBF: 2.5 million hours.
Workload: 550 TB per year.
Sustained Transfer Rate: Up to 291 MB/s (277 MiB/s).
Random Read 4KB: 212 IOPS. Average latency: 4.16 ms.

Key Performance Difference
Although the sequential speed is the same, there is a difference in how they handle tasks:
SAS (12 Gb/s): Being «Full Duplex» (it can read and write simultaneously) and having deeper command queues, it generally performs better on servers with multiple users accessing at the same time.
SATA (6 Gb/s): It is «Half Duplex» (it can either read or write), which makes it slightly slower in high-concurrency environments, although for general use or large backups, the speed of 291 MB/s remains constant.

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