Solved it   Enabled SSH in the control panel Connect via SSH using putty edited both etc/synoinfo.conf and etc.defaults/synoinfo.conf with the following in vi: maxdisks=22 esataportcfg=0x0 usbportcfg=0x‭7FC00000‬ internalportcfg=‭0x3FFFFF‬ rebooted, and all disks appear fine Might be handy for anyone else having this issue.   Cheers,  
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