Literally, the hard drive which has not been formatted by NT file system, such as FAT and NTFS, is called RAW hard drive or RAW partition.
However, not all burners give support for RAW mode. It can extract not only users’ data but also data of sub-channels.
In DVD burning methods, there is a RAW mode that refers to burning after reading the complete sector data. What’s RAW? To be specific, RAW is the default file system of CD-ROM recognized by Windows.