SCCM gives the error Task sequence has failed with the error code 0x800700A1.
It's likely the harddisk to be installed is unformatted and in RAW-format.
RAW-formats are not liked by SCCM, so check that the harddisk is formatted with eg NTFS.
Press F8 at install to open a command prompt and run the commands below.
diskpart list disk # Lists the disks select disk 0 # 0 being the disk to setup clean # Wipes the disk create partition primary # Creates windows partition select partition 1 format quick fs=NTFS # Format primary partition assign letter C # Optional exit
The command assign letter c may not always work. It's okay to skip it.
Restart the install and it should be a-ok.