Help!My  Pv715n encounterd a disk drive failure yesterday.Below is my screen capture from Dell OpenManage Array Manager.Now the Disk1,Disk2,Diks3 are fine.There is a missing disk.Is the missing disk is Disk0 or Disk4?715N nas event log said "pnp provider reported physical disk \Device\Harddisk0 was removed or is temporarily unailable". 

After searching Dell support site,i think the missing disk should be Disk0.

I found this link:http://support.dell.com/support/edocs/stor-sys/spv715N/en/admin/7h810c51.htm#1041631

Should i replace Disk0?

Thank very much in advance!