Hardware Spec Index

Novexa HD-6639 XT 20TB 7,200 RPM CMR Enterprise Hard Drive

Hard Drives · Novexa · SKU HD6639-XT · Released 2021 · Updated 2026-10-24

Key facts

Benchmark index2,806 (Hard Drives scale)
Category rank#6,045
Street price$519
Power8 W
Performance per dollar5.41
Released2021

Specifications

BrandNovexa
ModelNovexa HD-6639 XT
Capacity20 TB
ClassEnterprise
RecordingCMR (conventional magnetic recording)
Spindle speed7,200 RPM
Cache512 MB
InterfaceSATA 6 Gb/s
Sustained transfer280 MB/s
Workload rating550 TB/year
MTBF2.5 million hours
Helium-filledYes
Warranty5 years

Related guides

CMR vs SMR Hard DrivesNAS RAID Levels Explained

Similar Hard Drives

ModelBenchmarkPriceCompare
Mirenta HD-2606 Max 2TB 5,400 RPM CMR Desktop Hard Drive826$59Compare
Novexa HD-4517 Edge 6TB 5,400 RPM CMR Surveillance Hard Drive1,386$129Compare
Novexa HD-4562 Core 20TB 7,200 RPM CMR NAS Hard Drive2,341$349Compare
Novexa HD-4129 Core 20TB 7,200 RPM CMR NAS Hard Drive2,648$499Compare
Altrix HD-2444 Core 20TB 7,200 RPM CMR Enterprise Hard Drive2,466$379Compare
Strivon HD-7580 Ultra 6TB 5,400 RPM CMR Surveillance Hard Drive1,482$139Compare

All Hard Drives · JSON

Cite this page: Hardware Spec Index, “Novexa HD-6639 XT 20TB 7,200 RPM CMR Enterprise Hard Drive”, https://vextor7.com/item/19907458 (accessed 2026-10-24).