This MP contains some significant changes, most of them related to the monitoring of disks, taken directly from the related MP guide:
All these changes are really good improvements. But be careful with simply importing this MP into your production environment. Check all your overrides for the Disk Monitors/Rules in order to see whether they still apply with the new MP. Even better, test the MP in a lab environment first.
Also take notion of the notes as stated in the same MP guide, on page 9 and 10:
This version of the Management Pack consolidates disk monitoring for all types of disks as mentioned above. However, for Logical Disks, the previous Logical Disk Free Space monitor, which uses a combination of Available MB and %Free space, is still enabled. If you prefer to use the new monitors (Disk Free Space (MB) Low Disk Free Space (%) Low), you must disable the Logical Disk Free Space monitor before enabling the new monitors.
The default thresholds for the Available MB monitor are not changed, the warning threshold (which will not alert) is 500MB and the error threshold (which will alert) is 300MB. This will cause alerts to be generated for small disk volumes. Before enabling the new monitors, it is recommended to create a group of these small disks (using the disk size properties as criteria for the group), and overriding the threshold for available MB.
As you can see, RTFM is still very important with any MP.
Not only BEFORE importing a MP, but also WHILE importing the MP and AFTER it, since the MP needs tuning.
MP can be downloaded from here.