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Is SSD performance impacted by available space?

What % of your SSD space is used?

  • <= 25%

    Votes: 5 21.7%
  • > 25%, <= 50%

    Votes: 5 21.7%
  • > 50%, <= 75%

    Votes: 9 39.1%
  • > 75%

    Votes: 4 17.4%

  • Total voters
    23

ghanwani

macrumors 68020
Original poster
Dec 8, 2008
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1,716
I want to see how full people keep their SSD. I currently use about 100 or 500 GB and my use is not going up much.
 
Last edited:

Howard2k

macrumors 68030
Mar 10, 2016
2,906
2,160
I have a 256GB. When I get down to 50GB free I clear up space to push back to between 100GB-150GB free.
 
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ghanwani

macrumors 68020
Original poster
Dec 8, 2008
2,169
1,716
I've read that you want to have no less than 30% free. That's the rule of thumb I go by.

I did some searching and found this:
https://www.howtogeek.com/165472/6-things-you-shouldnt-do-with-solid-state-drives/
"As a result of its benchmarks, Anandtech recommends that you “plan on using only about 75% of its capacity if you want a good balance between performance consistency and capacity.” In other words, set aside 25% of your drive and don’t write to it. Only use up to 75% of your drive’s free space and you should maintain ideal performance. You’ll see write performance start to slow down as you go above that mark."​
 
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Michael CM1

macrumors 603
Feb 4, 2008
5,678
273
I had a 128GB MacBook Air before I got a 256GB MBP. Oh lord that got awful because of using Windows, Parallels and some other stuff. I have handed that one down to my mom/her grandkids and cleaned off enough to keep 25GB free. I really just needed maybe 150GB of storage. But just like with iPads and iPhones, I don't get a 128GB iPad because I need 128GB. I get it because I need at least 33GB.

And yes, free space affects performance, especially if your RAM is almost fully used. The OS uses storage as backup RAM. That's one of the many reasons flash storage makes a machine so much faster.

If I may, semantics: none of these Macs have "hard drives." The generic term is "storage." I know what you mean and I'm not poking fun at you because I still use that term a bunch. But I try to say "storage" to be correct as much as I can. That's 13 years of being a copy editor for you. :)
 
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ghanwani

macrumors 68020
Original poster
Dec 8, 2008
2,169
1,716
If I may, semantics: none of these Macs have "hard drives." The generic term is "storage." I know what you mean and I'm not poking fun at you because I still use that term a bunch. But I try to say "storage" to be correct as much as I can. That's 13 years of being a copy editor for you. :)

Thanks. I edited the original post to change it to SSD.
 
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ghanwani

macrumors 68020
Original poster
Dec 8, 2008
2,169
1,716
It's really no big deal. I just have to unleash that old copy editing energy somewhere. :)

It’s actually called hard drive on many manufacturer websites! In the grand scheme of things nothing is a big deal, but I’m known to be a bit pedantic myself.

These terms can be a bit difficult with advances in technology. I would regard SRAM, DRAM, NVRAM, ROM, SSD, HDD, all as storage.
 
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