Symptom
========
We are getting Disk transfer (reads and writes) latency is too high alerts.

The Avg. Disk sec/Transfer (LogicalDisk\Avg. Disk sec/Transfer) for the logical disk has exceeded the threshold. The logical disk and possibly even overall system performance may significantly diminish which will result in poor operating system and application performance.

Causes
=======
A high Avg. Disk sec/Transfer performance counter value may occur due to a burst of disk transfer requests by either an operating system or application.

Resolutions
===========
Apply Hotfix 2495300 on Server 2008 and Apply Hotfix 2470949 on Server 2008 R2.

Invalid "Avg. Disk sec/Transfer" value returned by the RegQueryValueEx function in Windows Server 2008 or in Windows Vista
http://support.microsoft.com/kb/2495300/en-us

The RegQueryValueEx function returns a very large incorrect value for the "Avg. Disk sec/Transfer" performance counter in Windows Server 2008 R2 or in Windows 7
http://support.microsoft.com/kb/2470949