Hardware Spec Index

Altrix HD-9421 Prime 20TB 7,200 RPM CMR NAS Hard Drive

Hard Drives · Altrix · SKU HD9421-PRIME · Released 2020 · Updated 2026-10-22

Key facts

Benchmark index2,640 (Hard Drives scale)
Category rank#13,001
Street price$499
Power8 W
Performance per dollar5.29
Released2020

Specifications

BrandAltrix
ModelAltrix HD-9421 Prime
Capacity20 TB
ClassNAS
RecordingCMR (conventional magnetic recording)
Spindle speed7,200 RPM
Cache512 MB
InterfaceSATA 6 Gb/s
Sustained transfer280 MB/s
Workload rating300 TB/year
MTBF1.2 million hours
Helium-filledYes
Warranty3 years

Related guides

CMR vs SMR Hard DrivesNAS RAID Levels Explained

Similar Hard Drives

ModelBenchmarkPriceCompare
Altrix HD-2740 Ti 4TB 5,400 RPM CMR Desktop Hard Drive834$59Compare
Mirenta HD-9240 Plus 20TB 7,200 RPM CMR NAS Hard Drive2,791$579Compare
Mirenta HD-8704 Edge 12TB 7,200 RPM CMR Surveillance Hard Drive1,905$249Compare
Mirenta HD-3734 Plus 12TB 7,200 RPM SMR Desktop Hard Drive2,335$319Compare
Novexa HD-3499 XT 8TB 7,200 RPM SMR Desktop Hard Drive1,829$209Compare
Altrix HD-5836 SE 28TB 7,200 RPM CMR NAS Hard Drive2,853$559Compare

All Hard Drives · JSON

Cite this page: Hardware Spec Index, “Altrix HD-9421 Prime 20TB 7,200 RPM CMR NAS Hard Drive”, https://vextor7.com/item/13465124 (accessed 2026-10-22).