Question SSD free space vs Over Provisioning

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ttonk81

Commendable
Apr 11, 2021
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I'm a little confused between free space and Over Provisioning on my Samsung SSD's

I have Over Provisioning set to 10% and thought this was to keep a portion of the drive free to help with performance and the life of the drive.
If I recall correctly when I applied the Over Provisioning it reduced the capacity of the drive so why is it that if I don't keep a certain amount of the allocated space free that Samsung magician tells me there is not enough free space on the drive.
Will it cause any harm or issues if I ignore the warning?
Just to be clear, I'm not talking about filling the SSD to 100% but when I get the warning with over 100GB free it does make me wonder what it's on about.
 
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A defined OP is pretty much the same as you just leaving space free.

With OP space predefined, you can fill up the space you do see to 100%.

Or, you can just leave it alone, and mentally know that you shouldn't fill it up past XX %.

The drive firmware shuffles data around among all the cells, for wear leveling.
OP does not wall off a particular chunk of cells to be used later.
 
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I have 1x NVMe (970 EVO) and 3x SATA (870 EVO, 860 EVO and 850 PRO)
Samsung magician says each drive has a 10% Over Provisioning set
I'm fairly sure when I enabled OverProvisioning the size of the drive was reduced so would confirm it defined but in that case, why does Samsung Magician tell me that there is not enough free space if I fill the drive

I can get some screenshots later if it helps
 
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With no Over Provisioning set the drive capacity is 931GB
zOb61xx.png

After setting a 10% Over Provisioning the drive capacity reduces to 838GB so would indicate its set correctly
3OZuFur.png

With Over Provisioning set and 221GB free space on the drive I don't get any errors in Samsung Magician about insufficient free space
JSBOhIq.png

If I add more to the drive, Samsung Magicial gives an error about insufficient free space yet there is 145GB free on top of the Over Provisioned amount.
This can be seen by the drive capacity showing as 838GB instead of 931GB as it was with no Over Provisioning set
Pf5Vl37.png


Do I need to worry about this or should I just ignore the warning in Samsung Magician?
 
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I copied COD from a different drive just to increase how much was on the drive but it does not matter what its added Samsung Magician still gives the same error when there is plenty of space on the drive.
The error is constant and not a result of trying to copy more data then there is free space
 
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It looks like COD for PC takes 175 GB, if copying from another drive maybe OP is also copying saves and mods and updates. Perhaps that is what is happening. As USAF said OP, it will be easier to assist if we know the size of the folder(s) you are copying.
 
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Sorry I said COD but it's actually COD warzone, 78.8GB.
With 145GB free on the drive it should fit with no issues and does copy over fine.
Its only Samsung Magician that's giving any error about free space.

The issue isn't the moving of the files, I am just querying about the error that Samsung magician is giving as it does not make any sense.
 
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145 / 838 = 17%
221 / 838 = 26%

It would appear that the free space threshold for warnings is between 17% and 26%, so I would expect that there is a 20% or 25% setting somewhere, either hard-coded in Samsung Magician, or a configurable option in the program.

ISTM that the 10% of overprovisioned space does not impact this calculation.
 
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Pextaxmx said:
very relevant read
https://www.samsung.com/semiconduct...SUNG-Memory-Over-Provisioning-White-paper.pdf
Click to expand...

DWPD = Daily Workload Per Day ???

Isn't that a tautology?

Typically, Samsung
DC SSDs are set to provide 6.7% of capacity for OP by default, but the user can manually adjust the size of the space if he or she
requires additional OP depending on the user environment.

How do I calculate the OP ratio?

OP Ratio Formula: OP (%) = ((Physical Capacity – User Capacity) / User Capacity) * 100

Ex) When 120 GB of a 128 GB SSD is used as the user capacity while 8 GB is assigned to the OP, the OP (%) is ((128 – 120) / 120) * 100 = 6.7 %.
Click to expand...

This doesn't make sense.

The actual capacity of the NAND array would be 128 GiB, not 128 GB, and the capacity available to the user would be 120 GB.

So the OP ratio is ...

(128 GiB / 120 GB) - 1 = 14.5%
 
Last edited:
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Pextaxmx said:
Drive Writes Per Day
1 Drive Write = drive size
Click to expand...
From Samsung's tech note:

A sufficient OP space decreases the NAND usage by improving the efficiency of internal NAND operations. It has the advantage of increasing the daily workload per day (DWPD) usable during the warranty period.
Click to expand...

It' s either "Daily Workload" or "Workload per Day".

"Daily Workload Per Day" is a tautology.

tau·tol·o·gy
(tô-tŏl′ə-jē)
n. pl. tau·tol·o·gies
1.
a. Needless repetition of the same sense in different words; redundancy.
b. An instance of such repetition.
Click to expand...
 
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