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Here’s the guide to add a drive (2nd) Installing iMac Intel 20" EMC 2133 and 2210 Dual Hard Drive I personally don’t recommend it! The Optical drives I/O is a very slow PATA connection ATA/100 (800 Mb/s). If you are thinking of adding a SSD you’ll be wasting it as the interface limits it.

The better direction is to replace the HDD iMac Intel 20" EMC 2133 and 2210 Hard Drive Replacement with a better drive. We still have an issue with this systems SATA port as its only SATA II (3.0 Gb/s) most SSD’s today are SATA III (6.0 Gb/s) and won’t work well in your system. You’ll need to find an older fixed speed SATA II (3.0 Gb/s) drive or a auto sense drive which will match the systems I/O speed. Review the drives spec sheet to make sure it lists SATA II if it doesn’t then its not able to support the slower interface.