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Ok, thank you very much, I will try to recover with PhotoRec, but I though the partition was still there and the files available..

Thanks Christophe for your comments!
Ok, I chose rdisk and EFI Partition.
Then I : [Analyze] Analyse current partition...
Afterwards appear the following:

1.png

And I press Quick search:

2.png

And finally I get two partitions:

Imagen 1.png

EFI: so small but I have the option fo listing ...

Hello,
I would need your expert advise for the following issue: It seems I deleted by mistake the partition in my external hard disk WD 750GB which I have been using with a Mac computer. I lost all my data while trying to upgrade to Snow Leopard OS on my Mac (I was following a tutorial which ...