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the marked thread connected to pin #1 of the socket. A similar rule was used for connecting cables
with the motherboard.
with the motherboard.
Incorrect connection of the cable with either the hard disk or the motherboard does not necessarily
damage the electronics of the disk or the motherboard. The hard disk is simply not detected or
initialized by BIOS.
damage the electronics of the disk or the motherboard. The hard disk is simply not detected or
initialized by BIOS.
There are some models of hard disks, especially the older ones, for which incorrect connection damaged the
electronics of the drive.
electronics of the drive.
***
We will not describe all the types of hard disks. Currently the most widely used are those with IDE or SCSI
interfaces. Unlike IDE hard disks, there can be from six to 14 SCSI hard disks installed in your PC. However, you
need a special SCSI controller (called a host adapter) to connect them. SCSI hard disks are not usually used in
personal computers (workstations), but are found mostly in servers.
interfaces. Unlike IDE hard disks, there can be from six to 14 SCSI hard disks installed in your PC. However, you
need a special SCSI controller (called a host adapter) to connect them. SCSI hard disks are not usually used in
personal computers (workstations), but are found mostly in servers.
Aside from an IDE cable, a four-thread power cable must be connected to the hard disks. There is
only one way to plug in this cable.
only one way to plug in this cable.
24.2.3. Configuring hard disk drives, jumpers
A hard disk drive can be configured in a computer as master or as slave. The configuring is done using
special connectors (called jumpers) on the hard disk drive.
special connectors (called jumpers) on the hard disk drive.
The jumpers are either located on the electronic board of the hard disk or a special socket that
provides for the connection of the hard disk and the motherboard.
provides for the connection of the hard disk and the motherboard.
There is usually a sticker on the drive that explains the markings. Typical markings are DS, SP, CS and
PK.
PK.
Each jumper position corresponds to one hard disk(s) installation mode:
DS – master/factory default
SP – slave (or no jumper required)
CS – cable select for master/slave: the purpose of the hard disk is determined by its physical
position with respect to the motherboard
position with respect to the motherboard
PK – jumper parking position: the position where one can put the jumper if it is not necessary in
the existing configuration
the existing configuration
The hard disk with the jumper in master position is treated by the basic input/output system (BIOS)
as bootable.
as bootable.
The jumpers on hard disks that are connected to the same cable can be in the cable select for
master/slave position. In this case, BIOS will deem as "master", the disk that is connected to the IDE
cable, which is closer to the motherboard than the other one.
master/slave position. In this case, BIOS will deem as "master", the disk that is connected to the IDE
cable, which is closer to the motherboard than the other one.
Unfortunately, hard disk markings were never standardized. You might well find that markings on your hard disk
differ from the ones described above. Moreover, for old types of hard disks, their purpose could be defined by
two jumpers instead of one. You should study the markings carefully before installing your hard disk in the
computer.
differ from the ones described above. Moreover, for old types of hard disks, their purpose could be defined by
two jumpers instead of one. You should study the markings carefully before installing your hard disk in the
computer.
It is not enough to physically connect the hard disk to the motherboard and set the jumpers properly
for the hard disk to function — hard disks have to be properly configured with the motherboard BIOS.
for the hard disk to function — hard disks have to be properly configured with the motherboard BIOS.