Well the title pretty much says it all. I have partitions that appear in the launcher when the system mounts them, just like when a USB key is plugged in.

I do not want these mounted internal hard disc partitions to show as icons in the launcher, but I do want my external USB to show there when I plug it in.

I've tried MyUnity - it has only an option to not show/hide all mounted devices, which is not what I want.

Can this be done?

From /proc/mounts (in order seen in screenshot):

/dev/sdb1 /media/CEDD-DE31 vfat rw,nosuid,nodev,relatime,uid=1000,gid=1000,fmask=0022,dmask=0077,codepage=cp437,iocharset=iso8859-1,shortname=mixed,showexec,utf8,flush,errors=remount-ro 0 0
/dev/sda3 /media/A423-E0E8 vfat rw,nosuid,nodev,relatime,uid=1000,gid=1000,fmask=0022,dmask=0077,codepage=cp437,iocharset=iso8859-1,shortname=mixed,showexec,utf8,flush,errors=remount-ro 0 0
/dev/sda5 /media/586C25656C253EDE fuseblk rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096 0 0
/dev/sda6 /home/greg/80gb ext4 rw,relatime,user_xattr,barrier=1,data=ordered 0 0

Other items from /proc/mounts not appearing in Unity launcher:

/dev/sda1 /boot/efi vfat rw,relatime,fmask=0022,dmask=0022,codepage=cp437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 0 0
/dev/sda9 /mnt/backup ext4 rw,relatime,user_xattr,barrier=1,data=ordered 0 0