Hardware Spec Index

Altrix HD-4521 Ultra 20TB 7,200 RPM CMR NAS Hard Drive

Hard Drives · Altrix · SKU HD4521-ULTRA · Released 2026 · Updated 2026-10-22

Key facts

Benchmark index2,538 (Hard Drives scale)
Category rank#14,155
Street price$359
Power8 W
Performance per dollar7.07
Released2026

Specifications

BrandAltrix
ModelAltrix HD-4521 Ultra
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
Strivon HD-6950 Pro 12TB 7,200 RPM CMR NAS Hard Drive2,045$239Compare
Mirenta HD-1772 XT 16TB 7,200 RPM CMR Enterprise Hard Drive2,000$229Compare
Mirenta HD-8899 Plus 2TB 5,400 RPM SMR Desktop Hard Drive761$49Compare
Altrix HD-6558 Pro 6TB 5,400 RPM CMR Surveillance Hard Drive1,447$129Compare
Strivon HD-7860 Ultra 2TB 5,400 RPM CMR Desktop Hard Drive668$49Compare
Altrix HD-8532 XT 20TB 7,200 RPM CMR NAS Hard Drive2,094$259Compare

All Hard Drives · JSON

Cite this page: Hardware Spec Index, “Altrix HD-4521 Ultra 20TB 7,200 RPM CMR NAS Hard Drive”, https://vextor7.com/item/6242018 (accessed 2026-10-22).