![]() Ordinarily, a CCC bootable backup volume will appear in this list, but occasionally your Mac's firmware may have difficulty discovering the hardware that hosts your backup. Using only device drivers that are stored on your Mac's firmware chip, the firmware will scan all of your SATA, PCI, USB, and Thunderbolt busses for hard drive devices, then read those hard drive volume headers to determine if a macOS system is available on each volume. When you boot your Mac while holding down the Option key, the Mac Startup Manager will display a list of available startup devices. Sometimes the Mac's firmware cannot detect your backup device
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