# CMR vs SMR for RAID: Rebuilds, Writes and Drive Choice

> Use CMR for conventional RAID 1, RAID 5, RAID 6, RAID 10 and similar software or controller arrays. Do not add an ambiguous SMR disk simply because its capacity matches.

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## Primary source
- [CMR vs SMR for RAID: Rebuilds, Writes and Drive Choice](https://cloudzat.com/cmr-vs-smr-for-raid/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 hard 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 vs SMR for TrueNAS](https://cloudzat.com/cmr-vs-smr-for-truenas/)