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 Post subject: iMac Disk Crunching
 Post Posted: Thu Feb 08, 2018 5:29 pm 
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Location: Hampshire UK
My 2010 iMac 27inch 1TB HD is continually "crunching" with the beach ball regularly occurring. I have a suspicion that the HD is about to fail. I have run nearly all the diagnostics and everything on the face of it seems OK. But cannot stop the crunching. I have used only 800 GB of the 1TB drive so don't consider any disk swapping to be an issue.
Running 10.13.3 with 8 GB Memory.
Any body any thoughts? This is a continuation of my previous post of the system locking up after going to sleep. I tried other things but its still doing it.
When TM running the back it seems to take for ever with constant crunching in the back ground.
Regards

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 Post subject: Re: iMac Disk Crunching
 Post Posted: Thu Feb 08, 2018 5:47 pm 
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Almost certainly the HDD on the way out.


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 Post subject: Re: iMac Disk Crunching
 Post Posted: Thu Feb 08, 2018 7:29 pm 
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Yep I agree. Back up and replace the internal drive - quickly.

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 Post subject: Re: iMac Disk Crunching
 Post Posted: Fri Feb 09, 2018 8:58 pm 
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But it might be something else.

At least to make things easier going forward you should at least take a clone of your system as it is now.


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 Post subject: Re: iMac Disk Crunching
 Post Posted: Sat Feb 10, 2018 1:01 pm 
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Thanks guys. I have done some 'housekeeping' i.e. deleted 11,000 plus emails!! and rogue files, and it seems better. Still investigating replacing the HD anyway. All backed up and ready to go!

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 Post subject: Re: iMac Disk Crunching
 Post Posted: Sat Feb 10, 2018 4:44 pm 
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Do you only have one User Account? How does it behave if you login to another one?

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 Post subject: Re: iMac Disk Crunching
 Post Posted: Sat Feb 10, 2018 5:14 pm 
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Download and run https://binaryfruit.com/drivedx it give's you 1 day free trail that will be enough to tell you if the drive is going.

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 Post subject: Re: iMac Disk Crunching
 Post Posted: Sat Feb 10, 2018 7:03 pm 
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If you do replace the hard drive I would highly recommend you replace it with an SSD. Choose one that is big enough - perhaps 500 GB or 1 TB - or you could use a cheaper 250 or 500 GB SSD if you add an external hard drive for large data such as movies and picture and music libraries - which don't benefit from superfast access.

Solid-state revolution: in-depth on how SSDs really work
Don't read beyond page one unless you want to make your head spin!

"In most cases, no other upgrade will provide the same level of subjective improvement as moving from a magnetic disk to an SSD."

"SSDs trade cost per gigabyte for almost universally increased performance, and the traditional balancing act of adding disks for storage capacity versus adding disks for their I/O bandwidth becomes quite a bit less important. The "slowest" current-generation enterprise-grade SSD you could purchase today is many times faster under almost every workload than even the fastest 15,000 RPM Fibre Channel spinning disk."


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 Post subject: Re: iMac Disk Crunching
 Post Posted: Mon Feb 12, 2018 10:17 am 
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As FE suggests, try running the computer from a new or different user account for a while. See if it works well there - or it does not.

Another thought, download and run the combo updater from Apple for the current system 10.13.3. That can often fix obscure problems like this, assuming of course that your hard disk is in fact healthy and not actually the real problem.


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