SSD Partitioning OP/Trim recommendations

Robert Moskowitz rgm at
Wed Dec 18 13:03:27 UTC 2013

On 12/18/2013 04:41 AM, John Obaterspok wrote:
> Hello,
> I'm going to setup F20 with a new SSD disk (256gb Samsung 840 PRO) and 
> was wondering about best practices for Over Provisioning during 
> partitioning.

hmmm.  I just ordered a Crucial M500 256GB SSD for my new install. I 
thought I would have it all to work with (currently using a 320GB HD, so 
that is a 64GB reduction already).  Are you implying here that you need 
to not use all of the SSD drive so that it has some swap around?

I chose the M500 over the 840 based on price and reviews.  The M500 uses 
MLC NAND compared to the 840 using TLC NAND.

> According to Samsung docs 
> (
> /"With the introduction of the 840 Series and the reality of 
> increasingly complex NAND fabrication processes, however, Samsung has 
> chosen to implement a minimum amount of OP in its mainstream drives 
> (the 840 PRO will not feature mandatory OP)."/
> Should I therefor make sure that I only fill up ~90% of the total disk 
> with partitions during install?
> Then what about the -discard mount option to get the drive to trim 
> deleted data, Is this something I have to manually add?
> Is it a best practice to add this or is it better to leave it alone or 
> use in some other way?
> -- john

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