MBA 13: USB external HD causes trackpad jiggle

Hi
I used my External HDD (7200 RPM) with my new MBA today and when it is connected my mouse cursor starts jumping and jolting when I have my finger held in a stationery position on the trackpad. Does anyone know why?! It occurs with both USB solts, so I assume this can be resolved through either a software update or a reformatting of my External HD, since perhaps it is in the wrong code (I formatted it from my old Leopard iMac)?
Thanks
Dave

many thanks kappy,
the mba is 10.6.5.
makes sense..
yeah i am currently trying to prove what you say is the case, by re-cloning my other 10.6.5 machines onto the various external hds i have, and seeing whether the mba reads them properly as bootable..
so far it's good with the fresh clone of the mbp we have here,
in a couple hours will try the fresh 27" i7 clone.
i tend to prefer factory made external hds and not fool around with aftermarket enclosures.
i'd imagine most lacie and samsung portable /desktop drives would be ok for bootable backups?
thanks again

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-- mod edit: read the Forum Etiquette and only post thumbnails http://wiki.archlinux.org/index.php/For … s_and_Code [jwr] --
Last edited by Gamonics (2015-02-27 00:25:01)

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edit: grammar. :X
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USB port powered SSD or thumb drives with minimal power requirements seem a good fit.
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<Subject Edited by Host>

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MBA 13: USB external HD causes trackpad jiggle

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