What % of a solid state drive should you reserve as "EMPTY"?

lip5016

macrumors regular
Original poster
Jul 11, 2014
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What % of a solid state drive should you reserve as "EMPTY"?

I've read it is not optimal to load them up to the very brim as it will affect performance.. Is 10% free space enough? 20% 25%??

Thoughts?! :D
 

556fmjoe

macrumors 68000
Apr 19, 2014
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They should already be over-provisioned from the factory, so technically you don't need to leave any space.

That said, it is not a bad idea to leave a chunk of free space there, but there's no hard and fast rule. On my 120 GB SSD (really 114.5 GB), I used 105 and left ~10 GB free. It depends more on your storage needs. If you can't spare the room, then use it all and don't worry about it. If you have more space than you need, then allocate what you think will be a comfortable amount and see what you have left.
 

lip5016

macrumors regular
Original poster
Jul 11, 2014
175
26
just got an official response back from Samsung..

Screen Shot 2014-10-06 at 10.36.29 AM.png

Looks like they recommend 10% to be left empty.. I will probably keep it around 15% empty for a little extra buffer.. They're Samsung 850 Pro's (fastest available SSD's) so I can't imagine them needing a whole lot of babying..
 

velocityg4

macrumors 601
Dec 19, 2004
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Even though they say 10%. It should be at least 20 GB for the swapfile. Personally I think if you have to worry about percentage free you have too small an SSD.
 

Eithanius

macrumors 65816
Nov 19, 2005
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Even though they say 10%. It should be at least 20 GB for the swapfile. Personally I think if you have to worry about percentage free you have too small an SSD.
Out of my 240GB SSD, I allocated 35GB partition for Yosemite, free space is left with 10GB or less... Still running fine.

Say if it's 10%, of what...? 10% of total storage space of 240GB (24GB), or 10% of my partition space of 35GB (3.5GB)...?
 

556fmjoe

macrumors 68000
Apr 19, 2014
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Out of my 240GB SSD, I allocated 35GB partition for Yosemite, free space is left with 10GB or less... Still running fine.

Say if it's 10%, of what...? 10% of total storage space of 240GB (24GB), or 10% of my partition space of 35GB (3.5GB)...?
10% of the total drive space. They're saying when you install the operating system, allocate no more than 216 GB to the OS and leave the rest unused.
 

rtan

macrumors newbie
Feb 6, 2014
20
0
just got an official response back from Samsung..

View attachment 501426

Looks like they recommend 10% to be left empty.. I will probably keep it around 15% empty for a little extra buffer.. They're Samsung 850 Pro's (fastest available SSD's) so I can't imagine them needing a whole lot of babying..
So, is this recommendation is specific for the SSD hard drive? It didn't state that. I general, any OS would recommends to reserved space for the OS. These are for logs, swap, and other uses that the OS may need. I don't believe you would have to leave 10% just because you're using an SSD.