# External Hard Drive CMR or SMR? How to Know Before and After Buying

> You usually cannot prove a sealed external hard drive is CMR or SMR from the enclosure name alone. Verify the internal model through supported software or after opening only when appropriate, then research that exact model. If recording method is mandatory before purchase, buy a bare drive with published specifications.

This context describes the Cloudzat canonical page at https://cloudzat.com/external-hard-drive-cmr-or-smr/. Current or last-verified Amazon price and image status belongs on the canonical page and is intentionally not frozen here.

## Primary source
- [External Hard Drive CMR or SMR? How to Know Before and After Buying](https://cloudzat.com/external-hard-drive-cmr-or-smr/index.md): Clean Markdown version of the full Cloudzat guidance.

## Related Cloudzat guidance
- [CMR/SMR hard-drive checker](https://cloudzat.com/cmr-smr-hard-drive-checker/)
- [Best CMR hard drives](https://cloudzat.com/best-cmr-hard-drives/)
- [Best CMR drives for NAS](https://cloudzat.com/best-cmr-hard-drives-for-nas/)
- [CMR vs SMR for NAS](https://cloudzat.com/cmr-vs-smr-for-nas/)
- [CMR vs SMR for ZFS](https://cloudzat.com/cmr-vs-smr-for-zfs/)
- [CMR hard-drive price per TB](https://cloudzat.com/cmr-hard-drive-price-per-tb/)