Thank you GSquared for your answer. I would like to ask something else:

If you only have 3 disk for organize your databases phisical desing, which option would you choose between the following configurations?

a. One disk for database files. one disk for log files. one disk for tempdb (data and log files). or...

b. One disk for database files. one disk for log files including the tempdb log file. One disk for tempdb datafiles.

Thank you for your help.

Hernan.