# Host-Managed SMR Explained: Zoned HDDs and Host Requirements

> HM-SMR is an SMR implementation in which host software manages zone state and sequential write placement. Out-of-order writes to sequential-write-required zones are rejected. This makes HM-SMR fundamentally different from a consumer DM-SMR drive that hides shingle management behind a conventional interface.

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

## Primary source
- [Host-Managed SMR Explained: Zoned HDDs and Host Requirements](https://cloudzat.com/host-managed-smr-explained/index.md): Clean Markdown version of the full Cloudzat guidance.

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