SMR hard drive list: check the exact model

Where SMR needs extra care

SMR overlaps recording tracks. Rewriting data can require additional work, so sustained or random-write behaviour differs from CMR and depends on the drive and workload. Toshiba specifically distinguishes its desktop SMR models from the N300 NAS line for continuous random-write use. Recording method alone does not predict a drive failure or prove that an entire family is compatible with your array.

Source: Toshiba: disclosed P300 SMR part numbers

Western Digital: check the complete Red model number

WD’s linked Red brief identifies WD20EFAX, WD30EFAX, WD40EFAX and WD60EFAX as SMR. Do not apply this conclusion to every model ending in EFAX or every drive sold under the Red name. Red Plus and Red Pro have separate specifications. Check the exact replacement model and your NAS compatibility list instead of treating a colour or family label as a guarantee.

Source: Western Digital WD Red product brief: exact models and recording technology

Seagate: documented BarraCuda examples

The linked BarraCuda datasheet identifies ST2000DM005, ST3000DM007, ST4000DM004, ST6000DM003 and ST8000DM004 as SMR. This is a list of those part numbers, not a claim about every BarraCuda revision or every Seagate enterprise drive. For a NAS alternative, inspect the exact IronWolf or other candidate model and its supported use.

Source: Seagate BarraCuda DS1900-14: model-by-model recording technology

Toshiba: three documented P300 SMR models

Toshiba’s April 2025 P300 datasheet identifies HDWD320UZSVA at 2TB, HDWD240UZSVA at 4TB and HDWD260UZSVA at 6TB as SMR. These exact codes are also marked in our manufacturer catalog. Retail package codes and older P300 revisions can differ, so the family name or capacity alone does not establish recording technology. The linked table is evidence for these three models, not every drive ever sold as a P300.

Source: Toshiba P300 April 2025 datasheet, page 2

How to check an unlisted model

Read the complete model number from the drive label or the operating system, then find the manufacturer’s matching specification or product manual. Check the recording-technology field and the capacity column. If documentation is ambiguous, ask the manufacturer before choosing it for a demanding array. A slow copy, cache size or spindle speed is not a reliable substitute for documented recording technology. Confirm that the Amazon offer actually identifies the same model. The catalog can narrow this check by recording technology and interface. Search the complete model number or a documented package code, then open the model page for its source. Models with missing recording data are not included in either the CMR or SMR filter.

Documented SMR model examples

Frequently Asked Questions