mount -a
'''NOTE:''' This would allow you to remount the drives on the previous paths in your previous installation. For example, if you have one 1TB 2TB and one 2TB 3TB harddrive, and they were mounted as /var/hda/files/drives/drive1 and /var/hda/files/drives/drive2 repectively, it would be more efficient to remount your data drives on your new Amahi installation in the same locations. If you didn't backup your fstab, simply remount the drives like you were installing them for the first time:
hda-diskmount