Hi Aled72
Maybe it is the warning I already posted here : http://plugout.net/viewtopic.php?f=36&t=2818&p=26621#p26621
if you do not run a safe remove the share settings are deleted and can be restored after plugging again the disk.
To restore the share, you just need to create again the share (data stored in it are still here)
About disk testing, it seems the kernel version does not allow the command?