/etc/my.misc

sda1    -fstype=ntfs,user,exec    :/dev/sda1
sda3    -fstype=ntfs,user,exec    :/dev/sda3
sda4    -fstype=ntfs,user,exec    :/dev/sda4

/etc/auto.master

/my /etc/my.misc --ghost 

When I run locate .pdf, I get nothing because though the mount points (sda1, sda2, ..) are created in /my - there's nothing in them till I access them. Unfortunately this is not good enough for updatedb and it purges its cache of /my/sdaX files. How do I prevent/solve this problem?