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I would like to bring to your notice that actually the Disk space in Plesk shows the space on the partition where vhosts are
configured, i.e. where domains are stored. You can move the vhosts data to new hard drive but you cannot use both the hard disks. You can use the following utility /usr/local/psa/bin/transvhosts.pl to change the Vhosts directory if needed.
It is possible to configure Parallels Plesk Panel to see system partition and VHOSTS partition, but if you add one more HDD where no Parallels Plesk Panel data is located - it will not be visible either. Otherwise, you may apply workaround:
You may move domains onto your new disk then Plesk will show the disk space of the new disk. Please refer to the following KB articles: http://kb.odin.com/en/1165 http://kb.odin.com/en/1186