The replacement test can be carried out by reconnecting the hard disk cable or replacing the IDE port and cable, and the fault will be found quickly. If the newly connected hard disk is not accepted, a common

The reason is the master-slave jumper on the hard disk. If two hard disk devices are connected to an IDE hard disk line, it is necessary to distinguish the master-slave relationship. The hard disk can't read or write or can't recognize this failure.

It is caused by CMOS setup failure. Whether the type of hard disk in CMOS is correct directly affects the normal use of hard disk. Today's machines all support the function of "IDE automatic detection".

When the hard disk type is wrong, sometimes the system can't be started at all, and sometimes it can be started, but there will be read-write errors.