Macbook no longer recognises external hard drive

Hello,
My Macbook Air doesn't recognise my HDD when I plug it in, however my dell laptop does.
When I plug it in the light of the HDD turns on and starts 'working' normally (no bizarre noises).
When I open my parrellel network, Windows recognises it however I still cannot access the files or open it in a window.
Any recommendations?
Thank you

One, post this in a forum that handles hardware, not the Pages for Mac forum.
It sounds like you may have your HDD formatted in something unusual. Like a Linux format perhaps?
With the drive plugged in, open Disk Utility and see if it recognises it and tells you what the formatting is. Don't reformat it or you'll lose all your content.
Peter

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