When transferring files to hard disk from file-based media, transfer the folder containing all related files and all of its subfolders. Keep the folder structure intact. For example, when transferring files from AVCHD file-based media, transfer the BDMV folder and all its contents
Yes, and your questions is?
Thanks for contacting adobe forums,
The reason is that
File-based camcorders from various manufacturers record video and audio into files of specific formats organized within specific directory structures.
Here is a document which explains this better http://helpx.adobe.com/premiere-pro/using/importing-assets-tapeless-formats.html
I believe this will help you, if there would be any doubt please reply us.
For example, when transferring files from AVCHD file-based media, transfer the BDMV folder and all its contents
Higher than that. You want the full PRIVATE folder.