Question 25% rule for the SSD? Explain.

[ditrate]

If I filled more than 75% of the SSD free space, will speed be affected or files integrity? Or it's a myth?

 

[Colif]

What I have noticed with UBM is it does not take much running at the same time to throw the numbers off.

It's best to run it when the machine is as quiet as possible.

Both tests were run with 1% CPU activity
scores vary based on the day, it shows as fine now
https://www.userbenchmark.com/UserRun/55219378

 

[Bob.B]

Both tests were run with 1% CPU activity
scores vary based on the day, it shows as fine now
https://www.userbenchmark.com/UserRun/55219378

I see the same thing.

I'm just guessing that one of windows many small background task tried to access the disk at the same time UBM was testing it.

Best you can do is try to make the machine as quiet as possible before running UBM.

Little stuff may not show in the cpu activity.

 

[alceryes]

SSD needs that space as unallocated space

Wear-leveling doesn't care about partitions.
I.e. you don't have to leave 'unallocated space' for wear-leveling. SSDs will use unused cells in a partition for wear-leveling.

 

[alceryes]

Some even need or just recommend a separate partition for "Disk provisioning" and than you don't need to worry about filling up whole disk or a partition.

Can you point to an instance of a drive manufacturer officially recommending creating an extra partition just for 'disk provisioning'? I've never heard of this.

 

[CountMike]

One example Samsung although it's not a must with latest models. Look at Samsung Magician even recommends size.

 

[USAFRet]

One example Samsung although it's not a must with latest models. Look at Samsung Magician even recommends size.

Size, yes.
A specific partition, no.

 

[alceryes]

One example Samsung although it's not a must with latest models. Look at Samsung Magician even recommends size.

I can't find anything referring to an actual extra partition for disk provisioning, just whitepapers and articles talking about over-provisioning, which is completely different from creating an actual extra partition for 'disk provisioning'.
Can you post a link?

 

[kerberos_20]

samsung does mention partition in OP settings, but its to pick a partition and make free unallocated space there

 

[alceryes]

samsung does mention partition in OP settings, but its to pick a partition and make free unallocated space there

Link?

 

[CountMike]

I can't find anything referring to an actual extra partition for disk provisioning, just whitepapers and articles talking about over-provisioning, which is completely different from creating an actual extra partition for 'disk provisioning'.
Can you post a link?

Have a look at Samsung Magician > Over provisioning. It suggests OP partition sizes.

 

[alceryes]

Have a look at Samsung Magician > Over provisioning. It suggests OP partition sizes.

I did glance over the Samsung over-provisioning whitepaper. Didn't see anything suggesting a separate partition for wear-leveling/over-provisioning.

 

[kerberos_20]

Link?

OP disabled, app shows which partition will be used for OP (that G:N...), partition color is matching legend named OP setting partition
here you can see partition in device manager

partition G is what will be used for OP

now setting up OP

partition G is selected, and i can set OP withing partition G available space range

OP was set

partition G shrunk by that amount, still shows as selectable for OP (in case ill need to increase OP size)
device manager shows some weird unallocated space

where did my OP partition go? can you find it?

 

[alceryes]

Ahhh, it's in the software itself. Thanks! That is weird. Maybe some older drives targeted the unallocated space for wear-leveling...? Funny how I didn't find verbiage in the whitepaper.

This isn't actually creating a wear-leveling partition though. This is Samsung suggesting a reduction in size of a candidate partition, probably to go in line with the 'always keep 10% free' adage. This is probably Samsung's knee-jerk reaction to making sure people don't fill up the drive over 90% full - can't fill up unallocated space.

Samsung should definitely word it better as I'm absolutely sure, with any decent quality SSD drive of the last few generations, that wear-leveling does NOT require unallocated space OR a separate wear-leveling partition. I can't speak for super-cheap knock-off brands of course.

 

[USAFRet]

That unallocated space IS the OP space.

Unlike an HDD, 'partitions' on an SSD are merely logical.
The data can reside anywhere.

That OP space, (here, 18.3GB) is simply space that is not allocated to some other partition.
Allowing you to freely fill all the other ones up to 100%, and not worry about free space on the drive.

Or, you can just keep a mental map in your head.
'Don't fill a 500GB drive past 400GB'

 

[alceryes]

Or, you can just keep a mental map in your head.
'Don't fill a 500GB drive past 400GB'

Specifically this!
Go ahead and create partitions allocating the whole drive - just don't fill it past ~90%.

 

[CountMike]

That unallocated space IS the OP space.

Unlike an HDD, 'partitions' on an SSD are merely logical.
The data can reside anywhere.

That OP space, (here, 18.3GB) is simply space that is not allocated to some other partition.
Allowing you to freely fill all the other ones up to 100%, and not worry about free space on the drive.

Or, you can just keep a mental map in your head.
'Don't fill a 500GB drive past 400GB'

Exactly, that's just for people that forget to leave enough space but that may be "selfish" to Windows that still need some free space for functionality.