The Avg. Disk sec/Read (PhysicalDisk\Avg. Disk sec/Read) for the physical disk has exceeded the threshold. The physical disk and possibly even overall system performance may significantly diminish which will result in poor operating system and application performance.
The Avg. Disk sec/Read counter measures the average time of data reads on the disk.
A high Avg. Disk sec/Read performance counter value may occur due to a burst of disk read requests by either an operating system or application.
To view recent history for the Physical Disk\Avg. Disk sec/Read performance counter you can use the following view:
Start Physical Disk Performance View
To increase the available storage subsystem throughput for the physical disk, do one or more of the following:
Upgrade the controllers or disk drives.
Switch from just a bunch of disks (JBOD) to striped arrays.
Increase the number of actual spindles.
Be sure to set this threshold value appropriately for your specific storage hardware. The threshold value will vary according to the disk’s underlying storage subsystem. For example, the “disk” might be a single spindle or a large disk array.