Question 1

Historically PMR Drives have had some latency issues. Can you feel the lag time with this drive vs conventional platter drives at the same speed?

Accepted Answer

Perpendicular Magnetic Recording drives are the industry standard and have been the only technology in use aside from SMR for years.
SMR drives are the ones that have performance issues when handling random writes to the disk.
Shingled Magnetic Recording is best used for large sequential data transfers as the drive must read-modify-write each time a track is changed because of SMR. Normal operation would be to simply write the data. On SMR drives over writing data requires that it must be read first then modified and then finally written. This is due to the fact that part of the area you wish to write to contains data from another track. Thus both tracks must be re-written.

The drives on this page use CMR/PMR which has no performance penalty and is the preferred technology if you want a disk that does not suffer from poor random write performance.

Question 2

Is this a good drive to get for a regular use PC? Currently, I have 3TB but it's almost all used up and I need more storage. I accidentally bought a NAS HDD and doesn't work with my current set up.

Accepted Answer

This is probably overkill for use in your PC. This drive is designed for 24/7/365 use. It is an enterprise level drive. And typically, enterprise drives cost more per GB. You could get by with a drive built for consumer use. That said, you can use this in your PC and it should work fine. 
Keep in mind, this is a 3.5” drive. This will not fit in a laptop, and most PCs are being built with 2.5” SSD drives or NVMe drives. Check your system to make sure you have the correct configuration for this.

Question 3

Would it be an issue to run two of these with two 7200 RPM WD Red Pro 8TB drives in a RAID 5 configuration?

Accepted Answer

These drives will work fine in any RAID configuration.  However, keep in mind that running two drives in a RAID 5 configuration is exactly the same as running in a RAID 1.

Brand	Seagate
Series	Enterprise Capacity 3.5
Model	ST8000NM0055
Packaging	Bare Drive

Interface	SATA 6.0Gb/s
Capacity	8TB
NAND Flash Memory Type	SLC
RPM	7200 RPM
Cache	256MB
Average Latency	4.16ms

Features	Capacity-Optimized Enterprise Hard Drive for Bulk-Data Applications - 8TB, 3.5-inch enterprise drive with industry-leading 6-disk technology, resulting in 33% more storage in the same storage slot - Advanced Write Caching feature to utilize enhanced algorithms, resulting in the industry's highest nearline storage workload performance efficiencies - 100% performance improvement in random writes over last-generation drive - Widely accepted, proven ninth-generation conventional perpendicular recording technology for reliable access to unstructured data in bulk storage applications - 12Gb/s SAS and SATA 6Gb/s interfaces in industry-standard advanced formats for easy integration into replicated and RAID multi-drive storage servers and systems - State-of-the-art cache, on-the-fly error-correction algorithms, super parity and end-to-end SAS-based data integrity for accurate data storage - Industry-leading rotational vibration tolerance design helps ensure consistent performance in dense multi-drive systems - Engineered for 24x7 workloads of 550TB/yr - 10x that of desktop drives - Robust performance with dual processors, ramp load technology, top-cover-attached motor and humidity sensor for optimum performance in all chassis - Seagate SeaTools diagnostic software to provide drive self-tests ensuring unnecessary downtime and maximizing TCO Best-Fit Applications - Hyperscale applications/cloud data centers with replicated storage - Massive scale-out data centers and big data analytics - High-capacity density RAID storage - Mainstream enterprise external storage arrays (SAN, NAS, DAS) - Distributed file systems, including Hadoop and Ceph - Enterprise backup and restore - D2D, virtual tape - Centralized surveillance
Usage	For Enterprise Storage

Form Factor	3.5"
Height (maximum)	26.10mm
Width (maximum)	101.85mm
Length (maximum)	147.00mm

Seagate Technology ST8000NM0055 Seagate Enterprise ST8000NM0055 8 TB 3.5" Internal Hard Drive - SATA - 7200 - 256 MB Buffer - OEM

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Item#: 1Z4-002P-000N0