Identification of Dell optiplex 390 MT new hard disk

According to the information you provided (motherboard model 0 m5CD), the chip H6 1 may be B2 stepping. According to Intel official website, the SATA2~5 port of B6 1/H67 stepped by B2 may be abnormal.

1. Use a tool similar to CPU-Z to check the stepping information of H6 1 to see if it is B2 or B3.

2. If it is B2, connect the 2T hard disk to SATA 1 to see if it is normal.

Where did you buy this Dell computer? When did you buy it? I suspect I bought it directly from Dell!