If your IDE drive is the only device on the bus

• Is it at the end of the cable?
• Is it configured as master?

If the drive is one of two devices on the bus

• Is one configured as master and the other as slave?
• Is the master drive at the end of the cable?
• Certain Macs only support master devices on their IDE controllers. If there is a problem with a master/slave configuration try the drives individually as master. If both drives work individually, the controller does not support a master/slave configuration.

Check that all connectors are seated correctly

• Try unplugging and re-plugging cable.
• Pin 1 (red or red striped conductor) is located nearest to the power connector.

Check the cable

• If possible, try replacing the cable.
• Total cable length should not exceed 18 inches.

Check the pins

Check for bent, pushed, or missing pins.

Run the drive with all other devices disconnected

• Disconnect all non-essential components and try the drive by itself on the cable. If the drive works, reinstall one device at a time until you find the conflicting component.
• If the drive is in an external enclosure remove the drive from the enclosure and attach it directly to the internal IDE bus.

If using removable carrier for drive

If the drive is attached through a removable carrier, try removing the drive from the carrier and attaching the drive directly to the bus.

If attaching an Ultra ATA/100 or faster drive to a controller that supports these speeds

Make sure that you are using an 80-conductor cable and that the devices are attached to the correct connectors:

• Blue - Controller (system).
• Black - Master device (HD0 or ID0).
• Gray - Slave device (HD1 or ID1).