syncronization error
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Now the problem is that I have de database in an external device, and I have the same ubication for the "directorio de datos and directorio base" and they tell me that is not possible that both are coincident.
Is for this reason I have the database made of only 2434 references instead of 2800 that I have before, and all the attached archive are missing. I don't know how to solve
But this wouldn't have anything to do with having fewer items in Zotero. If you're missing items in your database after repairing it, but you were syncing before and the items exist online, you should just delete the zotero.sqlite database and sync down the data from your online library.
Keeping your data directory on the external device is almost certainly what led to the database corruption, by the way.