![]() However, the report does not indicate to me your Fusion system is broken. You should see about 500MB/sec write speeds. However, the write speed is slower than nominals. Alone the 5400 can do no better than 75-80MB/sec. You actually have an Apple Fusion drive, a small SSD software-linked to a conventional mech hard drive, so your realtime scores are much faster the the 5400 rpm drives alone. Option 3 is if the HD is failing to pay to have it replaced, this would be very expensive however please let your Apple Authorized Service Provider quote the costs involved. If I were in your shoes, I'd seriously consider replacing the computer rather than investing time and money in old technology. The second option is to buy an external USB 2 SSD and use that as your startup drive, this will improve the performance quit a bit but you will still be left with a 8 year old machine. You have some options though, considering the computers age (now almost 8 years old) you may want to consider upgrading to a new 24" iMac, all them are dramatically faster than your current machine. If ANY errors are found that means the drive is failing. To test if the drive is is failing download the free version of DriveDX and run it. However if the HD is failing then it would need to be replaced. You would need to take the computer to your local Apple Authorized Service Provider to have it diagnosed and if the drive is unfused, ask them to re-fuse it. ![]() It appears you have a Fusion Drive however I cannot tell if the Fusion Drive has become unfused. The HD you are using is the bottleneck on the computer's performance. However to address your problem, you have a base model 21.5" iMac with a glacially slow 5400 RPM internal HD. Your computer has some problems, please turn Mac OS's security settings back on. ![]()
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