Set the jumpers on both hard drives to C/S.

Master, Slave and Cable Select Hard Drive Jumper Settings - PC ...

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If you ever have ever had to replace an IDE hard drive or CD/DVD drive for ... jumper settings that have to be set to make the computer recognize the drive correctly ... A standard IDE cable will have two connectors on it for the 2 IDE devices. ... Cable Select (CS) settings were designed to make it easier to connect hard drives ...