SWR is taking the figure out of context. In context this is the rating within which they achieve extremely high MTBF and it's similar to Seagate's specs (below) and probably others. Quote:
"Enterprise-class drives feature a WRL of 300TB to 550TB/year. Specialty-tuned drives, including NAS, archive, video and surveillance families, are rated for 180TB/year; Seagate’s client portfolio (desktop and laptop HDDs) has a workload rate limit of 55TB/year"
The speed factor is due to how the firmware is tuned for multiple concurrent video stream writes. Any HDD scores lower for multiple concurrent throughput than a single sequential write but you can gain some of the former by sacrificing the latter.
A mechanical drive spends its life in these states: Powered on and not spinning, powered on and spinning, seeking its heads, reading data and writing data. MTTB and MTTR are fabrications made up by marketing folks to rate their drives. The primary wear comes from spinning, thermal ups and downs, vibration and seeking. For a drive to last it has to have good bearings, resistance to thermal ups and downs (usually caused by reading and writing) and vibration tolerance. A low use drive to me means it spends most of its time powered up and spinning or not. That's what a purple drive does compared to other drives like the primary system drive.
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Wouldn't surveillance mean always running? 24/7?
"Enterprise-class drives feature a WRL of 300TB to 550TB/year. Specialty-tuned drives, including NAS, archive, video and surveillance families, are rated for 180TB/year; Seagate’s client portfolio (desktop and laptop HDDs) has a workload rate limit of 55TB/year"
https://www.seagate.com/www-content/surveillance-center/files/Understanding-Reliability-Metrics.pdf
The speed factor is due to how the firmware is tuned for multiple concurrent video stream writes. Any HDD scores lower for multiple concurrent throughput than a single sequential write but you can gain some of the former by sacrificing the latter.
A mechanical drive spends its life in these states: Powered on and not spinning, powered on and spinning, seeking its heads, reading data and writing data. MTTB and MTTR are fabrications made up by marketing folks to rate their drives. The primary wear comes from spinning, thermal ups and downs, vibration and seeking. For a drive to last it has to have good bearings, resistance to thermal ups and downs (usually caused by reading and writing) and vibration tolerance. A low use drive to me means it spends most of its time powered up and spinning or not. That's what a purple drive does compared to other drives like the primary system drive.
Thank you!