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Identify an SMR hard drive by its exact model number and the manufacturer’s recording-technology specification. A drive’s brand, capacity, TRIM support or cache size does not reliably establish whether it uses SMR. The documented examples below show why the full model matters.
What SMR changes
Shingled Magnetic Recording (SMR) overlaps neighboring recording tracks to increase data density. Rewriting part of a shingled area can require reorganizing a larger region. The drive or the host storage software must manage that behavior.
Drive-managed SMR handles the work inside the drive. Host-managed SMR requires a compatible storage stack to manage the drive’s zones. They should not be treated as interchangeable products. Seagate’s CMR and SMR explanation discusses the workload and integration requirements.
SMR does not imply that every read is slow or that the drive is faulty. Long or repeated writes can behave differently after buffers fill or data must be reorganized. A short transfer-rate result cannot prove the recording method.
How to find your drive’s exact model
In Windows, open Device Manager > Disk drives and inspect the model. This read-only Windows PowerShell command can also list the reported drive models:
Get-CimInstance Win32_DiskDrive | Select-Object Model, Size, InterfaceTypeIn Linux, a read-only device listing is:
lsblk -d -o NAME,MODEL,SIZE,TRANA USB enclosure or RAID controller can hide the underlying model or substitute its own name. In that case, check the drive label, purchasing record or a supported vendor identification tool. SMART utilities can also report model information; see our SMART-monitoring guide.
Search the manufacturer’s product page or datasheet for that full model and look for Recording Technology. If the specification does not identify it, ask the manufacturer. The old hdparm ... | grep TRIM shortcut is not a reliable SMR detector: TRIM/discard capability alone does not identify the recording technology.
Manufacturer-documented SMR model examples
The following exact models are marked SMR in the linked manufacturer documents, checked on 11 October 2026. This is a reference list of documented examples, not an exhaustive catalogue or a claim that every model remains for sale. Specifications for another model in the same family can differ.
| Manufacturer / family | Exact model | Capacity | Source |
|---|---|---|---|
| Seagate BarraCuda | ST8000DM004 | 8 TB | Seagate datasheet |
| Seagate BarraCuda | ST6000DM003 | 6 TB | Same Seagate datasheet |
| Seagate BarraCuda | ST4000DM004 | 4 TB | Same Seagate datasheet |
| Seagate BarraCuda | ST3000DM007 | 3 TB | Same Seagate datasheet |
| Seagate BarraCuda | ST2000DM005 / ST2000DM008 | 2 TB | Same Seagate datasheet |
| Seagate BarraCuda | ST1000DM014 | 1 TB | Same Seagate datasheet |
| WD Blue | WD60EZAZ | 6 TB | WD Blue product brief |
| WD Blue | WD40EZAZ | 4 TB | Same WD Blue product brief |
| WD Blue | WD30EZAZ | 3 TB | Same WD Blue product brief |
| WD Blue | WD20EZBX / WD20EZAZ | 2 TB | Same WD Blue product brief |
| Toshiba P300 | HDWD260UZSVA | 6 TB | Toshiba P300 datasheet |
| Toshiba P300 | HDWD240UZSVA | 4 TB | Same Toshiba P300 datasheet |
| Toshiba P300 | HDWD320UZSVA / HDWD220UZSVA | 2 TB | Same Toshiba P300 datasheet |
For comparison, the WD Blue document marks WD60EZAX as CMR and WD60EZAZ as SMR, both at 6 TB. Even the family name and capacity together are insufficient. Avoid extending the table’s classification to a similar-looking model code.
Is an SMR drive suitable for your workload?
A compatible drive-managed SMR model can suit light-duty storage with infrequent rewriting. For repeated large writes, RAID rebuilds, NAS storage or time-sensitive work, check the exact drive’s supported application and the NAS/controller vendor’s compatibility requirements before buying or mixing drives.
SMR does not universally cause parity errors or failed RAID rebuilds. Compatibility, firmware, workload and timing requirements determine whether a particular combination works. If a drive is already installed, identify it and assess the workload before deciding to replace it.
Keep backups whether you use CMR or SMR. SMART reports describe health indicators, while the manufacturer’s specification identifies recording technology. Neither an SMR label nor a healthy SMART report guarantees that your files are safe.