Environment: Esxi 6.5U2 on HP microserver gen8 and a ubuntu 18.04 vm.
I used vmkfstools to creat a vmdk link to a harddisk
vmkfstools -z "/vmfs/devices/disks/{diskid-xxxxxxxxx}" "/vmfs/volumes/{mydatastore}/hdd.vmdk"
then I add this vmdk to the ubuntu vm in ESXi Web UI and it can be seen like "/dev/sdb" in ubuntu shell
when I mount /dev/sdb1 ~/data, an error occured like "mount: wrong fs type, bad option, bad superblock on /dev/sdb1, missing codepage or helper program, or other error"
How can I use this disk?