My G-Technology External Drive is no longer recognised by my MacBook Pro. How do i repair this?

Following months of straightforward backing-up (using Time Machine) my 1TB G-Technology External Drive no longer appears on my screen when powered up and connected to my machine. I have read that this can happen after updates are downloaded onto the MacBook Pro (or indeed any other Mac product) but with update downloads being inevitable this cannot be avoided. Apple tentatively admit this is a problem but offer no solution that I can find! Even more annoyingly the drive itself is designed for use with Mac products and was the simplest plug'n play device I have ever used. Ideas please?
AB@isis

Contact the manufacturer for their trouble shooting support. In any case when updating the OS unmount and unplug external hardrives.

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