Problems trying to use an external drive as the boot drive (home)

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Mac mini M1

2020年モデルのMac mini（AppleのM1チップ搭載）に関する修理ガイド、分解、トラブルシューティング情報。モデル番号A2348で識別できます。

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Steven @steven2717

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投稿日: 2025年11月12日

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Problems trying to use an external drive as the boot drive (home)

My experience with the SanDisk Pro G40 on a Mac mini M1 has been frustratingly unstable. The drive is often invisible at cold boot, only appearing after unplug-replug or reboot. macOS updates frequently abort with LocalPolicy or sealed-system errors, sometimes forcing Recovery reinstalls.

The startup-disk choice resets, Mail and Music/TV libraries rebuild or vanish after path changes, and data seems lost. After sleep, the SSD randomly disconnects; Spotlight and iCloud loops rebuild indexes endlessly. FileVault, TRIM, and Thunderbolt power management make things worse, causing freezes or corrupted mounts. Cloning is nearly useless—only a clean migration gives stability.

From my testing and countless reports online, external booting on Apple Silicon is still technically possible but feels deliberately neglected by Apple and gets more fragile, slower, and frustrating with each macOS release.

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DanJ @danj 評価: 502.8千 Self employed contract worker 35 347 977 · Answer 1 · 2025-11-12T11:05:25-07:00

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DanJ @danj

評価: 502.8千

Self employed contract worker

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347

977

投稿日: 2025年11月12日

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Yes, this is a major issue in all of the M Series Mac systems. This is a technical limitation due to the architecture between the integrated Flash (NAND) storage and the heavy encryption these systems use to protect your data.

Apple expected people would use the internal as the boot drive and Home Drive per a discrete user account and as well as the Apps needed. Externals were for the bulky data and projects.

Even still you can make it better by reformatting your internal turning off encryption (first making a full backup) Turn off FileVault on Mac as well as use the Boot Manager Option (⌥) Mac startup key combinations and Change your Mac startup disk but using a Thunderbolt based drive not USB.

Here's a deep dive into ultra speed storage using an external drive New Apple Silicon Drive record... For LLMs if that's your direction.

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Mac mini M1

Problems trying to use an external drive as the boot drive (home)

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