what format are raw logs stored in the Indexer ?

[damode]

In addition to the main question,
Client wants to install Splunk in non-default partition (i.e not the default Splunk drive (C:)) and
also wants to store all indexes in other partition (E:)
It's on a Windows Server

I know that the above is possible but I would just like to know if there are any things I should keep in mind before doing that. If that would affect in the way Splunk operates

[HiroshiSatoh]

Also change the storage location of the data model.

For your reference
https://answers.splunk.com/answers/149722/how-can-i-change-the-location-of-accelerated-data-model-su...
https://answers.splunk.com/answers/134189/data-model-storage-and-backups.html