Add 7.2.1-rc.1 release notes (#373)

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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Documentation**
* Added Unraid 7.2.1 release notes covering upgrade guidance, known
issues, rollback notes, webGUI fixes, storage/pool/device behavior,
mover changes, kernel/base distro updates, and other improvements.
* Updated file-system management docs with version-specific WebGUI vs
CLI workflows, clarified mover behavior and manual migration steps.
* Added warning in legacy notes about the removed command‑line mover
option and advised using the WebGUI conversion workflow.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: ljm42

docs/unraid-os/release-notes/7.0.0.md

@@ -154,6 +154,12 @@ another file system, see below.  We will add a webGUI button for this in a futur
 
 ### Using 'mover' to empty an array disk
 
+:::warning[Removed in Unraid 7.2.1]
+
+This command line option was removed in Unraid 7.2.1. On newer releases, use the WebGUI method instead. See [Converting to a new file system type](../using-unraid-to/manage-storage/file-systems.mdx#converting-to-a-new-file-system-type) for details.
+
+:::
+
 Mover can now be used to empty an array disk. With the array started, run this at a web terminal:
 
 ```bash

docs/unraid-os/release-notes/7.2.1.md

@@ -0,0 +1,54 @@
+# Version 7.2.1-rc.1 2025-11-07
+
+This is a small update with some great fixes and improvements.
+
+## Upgrading
+
+For step-by-step instructions, see [Upgrading Unraid](../../unraid-os/system-administration/maintain-and-update/upgrading-unraid.mdx). Questions about your [license](../../unraid-os/troubleshooting/licensing-faq.mdx#license-types--features)?
+
+### Known issues
+
+For other known issues, see the [7.2.0 release notes](7.2.0.md#known-issues).
+
+### Rolling back
+
+If rolling back earlier than 7.2.0, also see the [7.2.0 release notes](7.2.0.md#rolling-back).
+
+## Changes vs. [7.2.0](7.2.0.md)
+
+### webGUI
+
+- Fix: Dashboard: Improved detection of newer Intel CPUs
+- Fix: Notification Agents dropdown not working in tabbed mode
+- Fix: Visual error displaying temperatures in notifications
+
+### Storage
+
+- Improvement: When a pool's File System Type is set to 'Auto', all pool slots must be populated
+- Improvement: New Config with Preserve Assignments will reduce pool slots to match the number of disks present
+- Improvement: Automatically clear devices when removing from pools
+- Fix: Remount dataset if 'zfs destroy' fails because dataset is busy
+- Fix: If a share is created without a config file, ensure data is only stored on pools that are participating in user shares
+- Fix: DeviceInfo: Only show 'Pool Device Status' section when pool is mounted
+- Fix: Empty Disk feature: share data on target disk(s) now remains visible during operation, see [Converting to a new file system type](../using-unraid-to/manage-storage/file-systems.mdx#converting-to-a-new-file-system-type) for usage details.
+  - Removed '-e' option from 'mover' script; use the webGUI now
+- Fix: Reduce excess logging related to drive spin down and SMART self-tests
+
+### Misc
+
+- Fix: Improve WSD discovery on your local network (so Unraid appears in Windows Network, formerly Network Neighborhood)
+  - Generate unique /boot/config/machine-id and install to /etc/machine-id on boot
+  - Patch wsdd2 to work when "Host access to custom networks" is enabled
+  - Note: discovery typically does not work if clients are running Tailscale
+- Fix: Update 'lshw' to support LEDs on Lincstation systems
+- Fix: Re-add the 'Join' Notification Agent from Unraid 6.12
+- Fix: Load br\_netfiltering in rc.inet1 'start' function and set default IPv4/IPv6 forwarding policy to ACCEPT (should fix VM IPv6 issues)
+
+### Linux kernel
+
+- version 6.12.54-Unraid (no change)
+
+### Base distro updates
+
+- lshw: version B.02.20
+- wsdd2-1.8.7-x86\_64-2\_SBo\_LT.tgz (patched to not exclude shim interfaces)

docs/unraid-os/using-unraid-to/manage-storage/file-systems.mdx

@@ -206,16 +206,18 @@ To safely convert to a new file system type:
 
 1. Move all data off the drive to another location (another %%array|array%% drive, %%cache pool|cache-pool%%, or external backup). Use one of these methods:
 
-   **Via the WebGUI:**
+   **Via the WebGUI (Unraid 7.2+):**
 
    - Navigate to ***Main → Array Operation*** and stop the array
    - Navigate to ***Settings → Global Share Settings***. In the **Emptying disk(s)** area, select the disk(s) to empty and **Apply**. Note: this status will automatically be removed when the array is stopped.
+     - In Unraid 7.2.0, any data on this disk will be hidden from user shares until this status is removed.
+     - Starting with Unraid 7.2.1, the data remains available to user shares but new files will not be written to the disk until this status is removed.
    - Navigate to ***Main → Array Operation*** and start the array
    - On ***Main → Array Operation*** click **Move** (or wait until mover runs via its normal schedule)
-   - Mover will empty the disk according to your Share settings. Note that files at the root of the drive are outside of any Shares and will not be moved.
+   - Mover will empty the disk, moving files to other array drives according to your Share settings. Note that files at the root of the drive are outside of any Shares and will not be moved.
    - Check ***Tools → System Log*** for messages about any files that could not be moved due to being in use or a lack of free space
 
-   **Or via the command line:**
+   **Or via the command line (Unraid 7.0 and 7.1 only):**
 
    - Move files [using 'mover' to empty an array disk](../../release-notes/7.0.0.md#using-mover-to-empty-an-array-disk) to other array drives