Hotfix KB2731284 or later update is not installed, will zero-out data files

When you run a MongoDB server (mongod) in Windows,

you can encounter the following error:

C:\Program Files\MongoDB\Server\3.0\bin>mongod
2015-06-08T20:29:47.485+0900 I CONTROL  Hotfix KB2731284 or later update is not installed, will zero-out data files
2015-06-08T20:29:47.565+0900 I STORAGE  [initandlisten] exception in initAndListen: 29 Data directory C:\data\db\ not found., terminating
2015-06-08T20:29:47.565+0900 I CONTROL  [initandlisten] dbexit:  rc: 100

You can fix it by creating the following directory:

C:\data\db

Unfortunately I can't understand why it fixed the problem.

Anyone who explains why?

Reference:
http://stackoverflow.com/questions/29316482/mongo-error-on-i-control-hotfix