1.5TB external HDD not recognised on various laptops

Hi,
I was wondering if anyone could help me.
I bought my toshiba 1.5 terrabyte external harddrive just over a year ago. It works fine on my other laptop and my boyfriend's laptop but when I connected it to four other new laptops (all different brands) recently it was not recognised on these laptops at all.
Is there something wrong with my external or is something on these computers blocking it from being recognised? Do you know how I can fix this problem?
Many Thanks!

Hello
And if you connect the external HDD to your and boyfriends notebook everything is still ok? You have only problems with new notebooks?
Well thats really strange Have you tested another USB cable and different USB ports?
Maybe on the new notebooks the antivirus or firewall program is blocking the access to external drive. Check your security software and allow external devices.

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Welcome to Discussions!
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Any hints?
TIA

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Message was edited by: CortB

sorry just edited the original message, no i cannot see it in system profiler, on either mac, and i can't see it in device manager on the windows.

1.5TB external HDD not recognised on various laptops

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