Does this drive feature CMR or SMR method?

First, you should use CMR on NAS because data can be freely rewritten over an existing track as it has no effect on neighboring tracks, allowing them to handle more random write operations. Second, according to Seagate and other sources, all IronWolf drives, including the ST12000VN0007, utilize CMR for consistent and optimal NAS performance.

doe it still has a seagate warranty?

It looks like it only has a 90 day warranty from Newegg

Questions & Answers: Refurbished: Seagate IronWolf NAS 12TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5-Inch Internal NAS Hard Drive (ST12000VN0007)

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Item#: 1Z4-002P-01A50
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Seagate IronWolf NAS 12TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5-Inch Internal NAS Hard Drive (ST12000VN0007)

Range of capacities up to 12TB.
Workload rate of 180TB/year.
Optimized for NAS with AgileArray, enables dual-plane balancing and RAID optimization in multi-bay environments.
Actively protect your NAS with IronWolf Health Management.
Rotational Vibration (RV) sensors.
Always-on, always-accessible 24x7 performance.
1M hours MTBF,90 days warranty from Newegg only

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