my chromebook won't recognise external hard drive or external cd player

nigel1

1. System:
2. Battery or AC:
3. Model:
4. Frequency of occurrence:
5. Reset OS:
6. Screenshot or video:

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Detailed description：

Blake_ASUS

Hi nigel,

Which Chromebook model are you using?

And what kind of port or cable are you using?

Thank you.