Because the operating system cannot see individual physical disks connected to the RAID controller, the RAID controller groups the disks into a RAID array to create a "virtual disk" that will be presented to the OS to use for storage just like it would any single physical disk. The OS isn't using a single actual physical disk, but a virtual disk which looks to the OS and behaves like a physical disk.
theflash1932
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November 23rd, 2013 07:00
Yes, Virtual Disk refers to a RAID array.
Because the operating system cannot see individual physical disks connected to the RAID controller, the RAID controller groups the disks into a RAID array to create a "virtual disk" that will be presented to the OS to use for storage just like it would any single physical disk. The OS isn't using a single actual physical disk, but a virtual disk which looks to the OS and behaves like a physical disk.