Hello again PAR-BR,
If you are sticking with 1.5.1.6 you need to be aware that many of us had problems with etilqsxxxx files building up in the Windows Temp folder and not being deleted on close down or disk cleanup. This is difficult to spot because they are hidden files. They take up tens of GBs and all you notice at first is free disk space diminishing. There is a complete string on this with some workarounds at http://community.wdc.com/t5/WD-Software/WDsmartware-building-etilqs-files-in-my-windows-temp-folder/td-p/307856.
This was an issue that was solved with 1.6 software
