CMR drive - PMR, also known as conventional magnetic recording (CMR), works by aligning the poles of the magnetic elements, which represent bits of data, perpendicularly to the surface of the disk. Better for a NAS
Ref: nascompares website
The Seagate ST4000VN008 IronWolf is a 4TB NAS-optimized hard drive offering 24×7 performance, scalable multi-bay support, and robust reliability with AgileArray technology and rotational vibration sensors.
Key Features and Advantages
NAS Optimization with AgileArray Technology: The drive is engineered for NAS environments, delivering dual-plane balancing, RAID optimization, and advanced power management for up to 8-bay NAS systems. AgileArray enhances system agility, reduces wear and tear, and supports high workloads of up to 180TB/year
Rotational Vibration (RV) Sensors: Designed for multi-drive NAS enclosures, the ST4000VN008 includes RV sensors to minimize performance degradation caused by vibration, ensuring stable operation in multi-user environments