Why are PCI Express (PCIe) based ExpressCards only recognized by Dell Precision Mobile Workstation M4300 or M6300 systems when the card is present at boot time?

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The Dell Precision Mobile Workstations M4300 and M6300 only support hot-plugging of USB-based ExpressCards. PCIe-based cards will only be recognized if they are present at boot time. They cannot be inserted or removed after the system has booted.

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Why are PCI Express (PCIe) based ExpressCards only recognized by Dell Precision Mobile Workstation M4300 or M6300 systems when the card is present at boot time?