A certain deployment uses the T3500 for data storage. Its operating system is installed on single disk over the network. After a period, the customer reports a system disk failure. Huawei Symantec technical support engineer replaces the faulty disk onsite, and then attempts to install the operating system from the CD-ROM. The disk indicators on the front panel are normal, but no hard disk is detected and the installation fails. Huawei Symantec technical support engineer presses Ctrl+C during the system self-check, but cannot start the SAS BIOS interface. Therefore, no hard disk is detected.