MBP does not recognise Lacie external Hard drive

hi,
I have a couple of 4-5 year old lacie 500 gig ext hard drives which now do not show up when plugged into the mac Book pro 2.8 intel duo core. I have used them only a couple of months ago no problems.
thank you

Older hard drive partitioning schemes will not show up on newer Mac OS systems. One file will show up stating "where did all my files go" or the equivalent. Of course the drive must be mounted first and sometimes a third party utility like disk warrior or drive genius must be used. To start up from any new external hard drive in system 10 or above the GUID partition scheme must be employed. If you will never boot from your external drives you can format as Mac Os extended (journaled) without checking the GUID box. Hope this helps as well.

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MBP does not recognise Lacie external Hard drive

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