Quote:

Originally Posted by zhup

Hello TwoCables,

What do think about this:



https://hardforum.com/threads/ssd-near-to-die.1932485/#post-1042992434

He's saying the same thing I am. If it's reading the percentage of the rated lifetime used, then it's saying that only 33% of the rated lifetime has been used. This is why you are seeing nothing but blue, which means everything is going very very very well for your drive. I think it would be best to just relax and enjoy your drive which is still in excellent condition.

 

At this time I am going to agree with 2 cables but remain skeptical. According to the crystal disk info manual linked several times the percentage for a micron drive is life used.

Every time I have ran a smart check on a brand new SSD it has been 100%, good. or just good.
I just ran a smart check on my Adata SSD in my machine I am currently on and it doesn't even give a percentage, just states "good"
Ran it on my laptop with an m.2 drive and it also says good at 100% but that is a transcend ssd not a micron. I have a crucial (micron) 128GB SSD in my second gaming rig at home that i could check later if you like and compare it.

 

Quote:

Originally Posted by XanderTheGoober

At this time I am going to agree with 2 cables but remain skeptical. According to the crystal disk info manual linked several times the percentage for a micron drive is life used.

Every time I have ran a smart check on a brand new SSD it has been 100%, good. or just good.
I just ran a smart check on my Adata SSD in my machine I am currently on and it doesn't even give a percentage, just states "good"
Ran it on my laptop with an m.2 drive and it also says good at 100% but that is a transcend ssd not a micron. I have a crucial (micron) 128GB SSD in my second gaming rig at home that i could check later if you like and compare it.

It would be good to compare it. Thank you in advance.

 

I installed stablebits software to compare to Crystal Disk Info on stablebits scanner it says 8% used for my corsair force GT 120 i got back in 2009 on Crystal Disk Info it says i have 92% left so their software is reading smart correctly just how it lists the results are differnt i have 32tb writes and 52tb reads on my drive.

 

Quote:

Originally Posted by Bal3Wolf

I installed stablebits software to compare to Crystal Disk Info on stablebits scanner it says 8% used for my corsair force GT 120 i got back in 2009 on Crystal Disk Info it says i have 92% left so their software is reading smart correctly just how it lists the results are differnt i have 32tb writes and 52tb reads on my drive.

Your Corsair force GT (SandForce):
Crystal Disk Info: 92% left
Stablebir Scanner: 8% used

So, it is matching.

 

Well after reading this:

Technical Note - M500 SSD Firmware MU02 SMART Attributes Reference



Looks like CrystalDiskInfo mislabels the 202 CA attribute, it's not "Percent Lifetime Used" but "Percent Lifetime Remaining".

The raw value in OP's SSD is hex 43 = dec 67. Thus 100-67 = 33.

The paper explains that the raw value is the quotient of: Average erase count for a super block (stripe of blocks) / erase count for which the part is rated (block life).

So it sounds like remaining lifetime is 33%, based on erase count ratio (and not on power on hours).

Now the weird thing here is that if ~10TB of writes have eaten 67% of the lifetime, total SSD lifetime would be a meager ~15TB.. At least under OPs particular conditions of usage.

 

I forgot that the PNY ssd from my main rig transitioned to the second when i upgraded the main to a sammy SSD. I don't think I have a Crucial SSD at my disposal anymore. Sorry bud.

 

Quote:

Originally Posted by TELVM

Looks like CrystalDiskInfo mislabels the 202 CA attribute, it's not "Percent Lifetime Used" but "Percent Lifetime Remaining".

I reported this topic to CrystalDisk developer. Let's hope he answer.

Quote:

Originally Posted by TELVM

Now the weird thing here is that if ~10TB of writes have eaten 67% of the lifetime, total SSD lifetime would be a meager ~15TB.. At least under OPs particular conditions of usage.

This is really weird:
- this ssd is mostly free (78,6GB free of 111GB),
- 685 working days and about 11TB writes,
- no special actions or tasks was done on it,
- it is in NAS server as OS drive (Windows Server 2012).

 

Crucial says 72TBW endurance for the M500. And it uses MLC so its NAND should last a while.

Interesting post on the subject from a Crucial rep.

There's a Crucial utility for its SSDs that shows SMART data.

 

Quote:

Originally Posted by TELVM

Crucial says 72TBW endurance for the M500. And it uses MLC so its NAND should last a while.

Interesting post on the subject from a Crucial rep.

There's a Crucial utility for its SSDs that shows SMART data.

Hello Telvm,

Thank you for your involvement.

The Crucial Storage Executive software shows that 67% Lifetime is used.

 

IMHO as long as "reallocation event count" remains at zero the NAND is healthy (as far as can be said from SMART data). I'd only worry (start thinking about replacing the SSD) if and when that number begins to creep up.

Then if and when "unused reserved block count" countdown approaches zero, I'd go panic mode (replace SSD ASAP!).


How NAND dies by a thousand cuts: The SSD Endurance Experiment: They're all dead.

 

Quote:

Originally Posted by TELVM

IMHO as long as "reallocation event count" remains at zero the NAND is healthy (as far as can be said from SMART data). I'd only worry (start thinking about replacing the SSD) if and when that number begins to creep up.

Then if and when "unused reserved block count" countdown approaches zero, I'd go panic mode (replace SSD ASAP!).


How NAND dies by a thousand cuts: The SSD Endurance Experiment: They're all dead.

I will replace this ssd with new one next week.

I have two possibilities:
- Intel SSD 535 - SandForce 2281, 16nm MLC NAND, 5 years warranty.
- Adata Premier Pro SP920 - Marvell 88SS9189, 20nm MLC NAND, 5 years warranty.

Which should I choose?

 

You want to replace a perfectly good drive?

 

Quote:

Originally Posted by TwoCables

You want to replace a perfectly good drive?

I do not trust it (only 11TB writes and used in 67%). No logic.
Now I have time to do this.

 

I honestly believe this thread needs relaxing music

:

 

that reminds me of that terrible eye of the spider song by that little kid