I would like to add more hard disks in my PC. When I click F12 during machine boot, I see the "Startup Device Menu", would you explain the meaning of COS0 & COS1 in the following?
Startup Device Menu
4. IDE CD: HL-DT-DTDVD-RAM GH60N
5. PCI SCSI: COS0 ST3300657SS
6. PCI SCSI: COS1 ST3300657SS
(I am not system support people)