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Any time you connect a drive out of another computer internally on an IDE cable when there is another device on the cable, be it hard drive or optical drive, both drives have to be appropriately jumpered for the cable type. There are 4 possible jumper settings - master, slave, cable select, and (on some drives) single/master, slave not present. Jumper block location and sequences are not consistent between different brands of drives, and even different models from the same manufacturer. Different combinations may or may not work. Position of the drive on the cable (end or middle) can also be critical. In a nutshell, if you are not familiar with drive jumpering, you are better off using the external solution. On an external adapter, generally if the drive was at one time working in the old computer it will work on the adapter without rejumpering - but if you have a problem cable select will *always* work on the adapter.
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