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Your iMac model uses an ATA (IDE) standard hard drive so there are many compatible drives on the market. Either a 5400 RPM or a 7200 RPM disk will give you a performance boost because the stock disk was only 4400 RPM. Low End Mac,, recommends 7200 rpm models but then warns about overheating in fanless macs. Personally, I've installed several 5400 Maxtor disks (including my G3 iMac and my 6400) without problems. This is a worthwhile upgrade and will add years to the usable life of your iMac. If you want to see a good summary of the replacement procedure try:
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