When i try to mount my ntfs partition when I'm installing Ubuntu server, I get this message:

Code:
The attempt to mount a file system with type ntfs in SCSI3 (0,0,0), partition #1 (sdb) at /windows failed.
You may resume partitioning from the partitioning menu.
Do you want to resume partitioning? Yes/No or Go Back
Is this normal, am I not meant to be able to mount ntfs drives at install time?