Hardware Spec Index

Altrix HD-4991 XT 20TB 7,200 RPM CMR NAS Hard Drive

Hard Drives · Altrix · SKU HD4991-XT · Released 2019 · Updated 2026-10-25

Key facts

Benchmark index3,100 (Hard Drives scale)
Category rank#35,635
Street price$599
Power8 W
Performance per dollar5.18
Released2019

Specifications

BrandAltrix
ModelAltrix HD-4991 XT
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

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Cite this page: Hardware Spec Index, “Altrix HD-4991 XT 20TB 7,200 RPM CMR NAS Hard Drive”, https://vextor7.com/item/7672586 (accessed 2026-10-25).