@ChaosLord
What filesystem does the RAMdisk.device use?
There is no such device. However, ramdrive.device (RAD) uses whatever filesystem you use in the mountlist, by default FFS.
ram-handler (RAM Disk:) on the other hand has built-in filesystem. It is quite different from traditional filesystems as it only needs to keep the data in memory and never write it out to physical media.