![]() Once complete, and protected by SIP, the installer then creates the Merkle tree of hashes up to the Seal, the one hash to rule them all, and makes a snapshot. During system installation, the whole system is created on the System volume. To understand why that’s perhaps the wrong question, we need to step through how Big Sur creates the SSV in the first place. So the System volume at disk3s1 (your numbers may differ) has a broken seal? Only what you then see may lead you to think that something has already broken the seal on your Mac’s SSV. ![]() One perhaps obvious way to see the status of each volume, including the SSV, is using the Terminal command Things are a bit different on an M1 Mac, which I’ll return to later. If your Mac is an Intel model, then I’m afraid that utilities such as System Information or Disk Utility don’t seem to know. So how can you check whether your Big Sur System volume is correctly sealed? The most important security feature in Big Sur is its new Sealed System Volume (SSV), which locks away all immutable system files with an ingenious method for preserving their integrity. ![]()
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