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--- upgrade_macbook [2026.04.15 09:01] – created Steve Isenberg
+++ upgrade_macbook [2026.04.15 09:15] (current) – Steve Isenberg
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   * **Backup:** Always maintain a current **Time Machine** backup before a major migration.
   * **Power:** Plug both MacBooks into a reliable power source.
-  * **Connection:** For maximum speed, connect them via a **Thunderbolt cable**. Otherwise, ensure both are on the same Wi-Fi network.
+  * **Connection:** For maximum speed, connect them via a **Thunderbolt cable** (see below). Otherwise, ensure both are on the same Wi-Fi network.
 ---
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   - Click **Continue** to begin the transfer.
----
-=== Post-Migration Tips===
+----
+==== Post-Migration Tips====
   * **Touch ID:** You must re-enroll your fingerprints on the new hardware.
   * **Apple Wallet:** Credit cards must be re-added manually for security.
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 > **Note:** If an app was built only for Intel, the M1 Mac will automatically ask you to install **Rosetta 2** the first time you open that app.
-```
+----
+====== What is a Thunderbolt Cable? ======
+It is a common point of confusion: while a Thunderbolt cable uses the **USB-C connector shape**, not every USB-C cable is a Thunderbolt cable.
+A helpful analogy: **USB-C is the shape of the plug, but Thunderbolt is the high-speed engine inside.**
+==== The Key Differences ====
+While they look identical at a glance, the hardware inside the cables is very different.
+^ Feature ^ Standard USB-C Cable ^ Thunderbolt (3 or 4) Cable ^
+| **Max Speed** | Usually 5 Gbps or 10 Gbps | Up to **40 Gbps** |
+| **Video Support** | Often limited to one 4K display | Supports **dual 4K** or one **8K** display |
+| **Inside the Cable** | Simple wiring | Contains active chips for high-speed data |
+| **Primary Use** | Charging and basic syncing | High-speed transfers, docks, and eGPUs |
+==== How to Tell Them Apart ====
+Because they look so similar, manufacturers use a specific marking system:
+  * **The Lightning Bolt:** Authentic Thunderbolt cables almost always have a small **lightning bolt icon** printed on the plastic housing of the plug.
+  * **A Number:** Many modern Thunderbolt 4 cables will also have a small **”4”** next to the bolt.
+  * **The ”Plain” Cable:** If the cable is blank or only has a USB ”trident” logo, it is likely a standard USB-C charging or data cable.
+==== Why it Matters for Your Migration ====
+If you use a basic **USB-C charging cable** (like the white one that came with your MacBook's power brick) to connect the two Macs, the transfer will work, but it will be **significantly slower**. It can sometimes take 10+ hours for large amounts of data.
+Using a true **Thunderbolt cable** creates a massive data ”pipe” between the two machines, often cutting that transfer time down to an hour or two.
+> **Pro Tip:** If you don't want to buy a Thunderbolt cable for a one-time move, using a **Time Machine backup on an external hard drive** is often faster than using a basic USB-C cable or Wi-Fi.