The WD WD Red Legacy 10TB (WD100EFRX) uses CMR recording.
Verified against: Western Digital internal client HDD recording technology - SMR drives by capacity (7 July 2020) · Checked
Conventional recording writes tracks side by side without overlap, so a write never forces the drive to rewrite neighbouring data. That makes the WD100EFRX safe for every use including RAID, ZFS, a NAS, and anything with sustained random writes. A rebuild or a resilver on this drive behaves the way the array expects, which is the whole reason the distinction matters. There is no recording-technology reason to avoid this drive for any workload.
| Model number | WD100EFRX |
| Brand | WD |
| Family | WD Red Legacy |
| Capacity | 10TB |
| Form factor | 3.5" |
| Rotational speed | — |
| Cache | — |
| Recording technology | CMR |
| Workload rate | — |
| Warranty | — |
| Status | Discontinued |
| Replaced by | — |
A dash means the manufacturer does not state that field for this exact model. We leave it blank rather than filling it from a retailer listing.
It is CMR. That comes from Western Digital internal client HDD recording technology - SMR drives by capacity (7 July 2020), which is WD's own documentation for this exact part number rather than a capacity-level summary or a retailer listing.
Yes. Conventional recording means a write never forces neighbouring tracks to be rewritten, so rebuilds and resilvers behave normally. There is no recording-technology objection to this drive in an array, check the workload rating and warranty for your duty cycle separately.