Antonio your drives must have had dmraid metadata on them!
This is the only way for Ubuntu to detect this type of RAID and as a result it
activated your disks in that way.
Removing the metadata (with dmraid -E) fixed your issue.
You must have created a RAID array at some point or bought second hand drives.
This is an invalid bug
** Changed in: dmraid (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/760940
Title:
dmraid mounts inexistent arrays
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