若Mac無法正常啟動(dòng)或需重裝macOS但無法運(yùn)行安裝程序，可使用目標(biāo)磁盤模式。準(zhǔn)備兩臺(tái)Mac、合適的數(shù)據(jù)線、主機(jī)上的macOS安裝程序，并將目標(biāo)Mac置于目標(biāo)磁盤模式。1. 關(guān)閉目標(biāo)Mac并連接至主機(jī)；2. 按住T鍵開機(jī)進(jìn)入目標(biāo)磁盤模式；3. 主機(jī)識(shí)別到目標(biāo)Mac的磁盤后，打開安裝程序并選擇該磁盤進(jìn)行安裝；4. 如需要可先用磁盤工具擦除或分區(qū)；5. 安裝完成后斷開連接并單獨(dú)啟動(dòng)目標(biāo)Mac即可。注意確保數(shù)據(jù)線支持傳輸、兩臺(tái)設(shè)備均支持目標(biāo)磁盤模式，若未識(shí)別磁盤可嘗試先用磁盤工具處理。

If your Mac isn’t booting properly or you need to reinstall macOS on a machine that can’t run the installer normally, Target Disk Mode can be a lifesaver. It lets you use one Mac’s storage as an external drive connected to another Mac, which makes installing macOS possible even when the affected Mac can't start on its own.

What You Need Before Starting

Before jumping into the installation process, gather the essentials:

• Two Macs: One that needs macOS reinstalled (the target) and another working Mac (the host).
• A proper cable: Depending on your Mac models, you might need a Thunderbolt cable, FireWire cable, or USB-C cable.
• macOS Installer on the host Mac: Make sure it's downloaded and ready to go.
• Target Mac in Target Disk Mode: This is how you’ll access its drive from the host.

Once everything is ready, you can move on to getting the target Mac into Target Disk Mode.

How to Boot Into Target Disk Mode

Getting a Mac into Target Disk Mode is simple, but timing matters:

• Turn off the target Mac completely.
• Connect it to the host Mac using the correct cable.
• Power on the target Mac while holding down the T key.
• You should see a Thunderbolt or Firebolt icon appear—depending on your Mac model—that means it's in Target Disk Mode.

On the host Mac, the internal drive of the target Mac will show up like any other external drive. At this point, you're ready to install macOS onto it.

Installing macOS on the Target Mac’s Drive

Now that the host Mac sees the target Mac's drive, follow these steps:

• Open the macOS installer on the host Mac.
• When prompted to choose a disk, select the target Mac’s drive—not the host’s!
• If needed, use Disk Utility to erase or partition the drive first. Make sure it's formatted correctly for macOS (usually APFS or Mac OS Extended).
• Proceed with the installation. It may take 15–45 minutes depending on the Mac and macOS version.
• Once done, shut down the host Mac and disconnect the cable.

After this, power on the target Mac by itself—it should now boot into the freshly installed macOS.

Notes and Troubleshooting Tips

Not all Macs support Target Disk Mode over every kind of connection. Some older models require FireWire, while newer ones work via Thunderbolt or USB-C. If nothing happens when you press T, double-check:

• The cable supports data transfer (not just charging).
• Both Macs support Target Disk Mode.
• The target Mac is fully powered off before starting.

Also, if the macOS installer doesn’t recognize the target drive, try running Disk Utility first to ensure the drive is properly formatted and partitioned.

That’s about it—you’ve successfully installed macOS on a Mac using Target Disk Mode.

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