/dev/hdb1 (mount point) ntfs auto,ro,umask=0
'mount point' is a folder, for example /mnt/hd . 'auto' is the option for mounting on boot, ro is for read-only*, umask=0 is for setting the permissions to rwxrwxrwx, since you can't change them with chmod because they're Windows partitions.
*It's a bad idea to write to NTFS, the driver that comes with Slack refuses to do it unless you specify it in kernel configuration. There is a new driver, but it'll still mess up NTFS, though not as much.