Hi all, I was monitoring the performance of our SQL SERVER using perfmonitor. The data for several counters was collected for a period of 24 hours. The data collected by all the counters seemed fine and returned the values with are acceptable by norms. But the counter % disk time (which is set up against d: drive, where all the datafiles are located) is returning an average value of around 750. I have read form artiles that this counter is supposed to be under 55% (to indicate that the disk I/O is good enough). I was dubious about my calculation and tried collecting the data again for another set of 24 hours, but much to my distress, it returned almost identical value (750). Please some one let me know if I an doing some thing wrong, All I was doing was, calculating the average value of all the values returned by the perfmon. and this avegare value is 750. Do i need to do some more calculation since its a percentage or some thing ?? or is it the case that our server is having a really high I/O contention?? Thanks in advance.