SQL Server Perf: What is the optimal disk or data file placement configuration layout for better performance?

SQL Server manages when and how disk I/O is performed, but the Windows operating system performs the underlying I/O operations. The I/O subsystem includes the system bus, disk controller cards, disks, tape drives, CD-ROM drive, and many other I/O devices. Disk I/O is frequently the cause of bottlenecks in a system. Having said that SQL Server uses the specific storage ages of TEMPDB, Transaction log file and database files, whereever you see the best practice always dictate that seperating TEMPDB...(<a href="http://sqlserver-qa.net/blogs/perftune/archive/2010/09/29/9427.aspx">read more</a>)<img src="http://sqlserver-qa.net/aggbug.aspx?PostID=9427" width="1" height="1">