I think Clem will explain mintDisk shortly in the newsletter or the magazine
Basically any partition mentioned in any way in fstab does not get mounted (and it's only FAT and ntfs in mintDisk)
I have yet to get /dev/hdd1 mounted on /ntfs1 even though I have added it fstab.
So remove it from fstab and mintDisk will automount it
You should only mount in /media (usually)
/media/hdd1 or whatever your drive is
The reason it does not get mounted by fstab is probably that the folder /nfts1 does not exist