The Momentum Cache in Storage Executive has been "unable to activate" since I installed Storage Executive many weeks ago. I have a theory to test, about why the WAF has been so high. (For the same reason, I set the BIOS to underclock cpu & dram and lowered max cpu power consumption & dram voltage.) And I don't want to be victimized by read errors in a few years. I don't have much income so I want my hardware to endure for MANY years. Why would you not be "concerned in general?" If it's because you can afford to replace your hardware frequently, that's not as general as can be. Waiting to see if they have any other ideas, and if they will ever respond to my concern about the accelerating decrease of Remaining Life.) (In their most recent email, after a couple weeks of silence, they asked if my pc has an uninterruptible power supply - it does - and asked me to run the two self-tests in Storage Executive - both succeeded. I presume Momentum Cache could do a better job than Windows cache to reduce write amplification, but I've been unable to "activate" Momentum Cache and none of the suggestions from tech support were able to identify the reason why not. The Windows 10 write cache policy has been its default setting: Enabled, with buffer-flushing Not turned off. I assume write amplification can be improved by write caching. It's sad that Storage Executive doesn't display Total Writes Including Amplification. It must just use a different unit that makes it seem a little larger, like the way a MByte is more than 1 million bytes. Now that I know the WAF, I assume the Total Bytes Written that was displayed by Storage Executive is really the same as Total Host Writes. Is the 6.59 WAF unusually large for an ssd that's mostly empty and hasn't had a lot of deletes?Ĭan you explain the acceleration of the decrease of Remaining Life versus bytes written? That's similar to the ratio of Total Host Writes to SMART F7 above, which is about 29 KB. Note: The size of a NAND page is about 30 KBytes according to a 9-page 2019 academic paper I found by googling 'nand page size crucial mx500' ("Why and How to Increase SSD Performance Transparency" at ). Can someone explain what's happening? Am I misinterpreting the meaning of Remaining Life? Isn't it essentially a synonym for endurance? My understanding is that Remaining Life is supposed to depend on bytes written, but it looks more like the drive reports a value that depends mainly on its powered-on hours. Note 5: Storage Executive also shows that Total Bytes Written isn't much greater than Total Host Writes, implying write amplification hasn't been a significant factor.) Note 4: Three different software utilities agree on the numbers: Crucial's Storage Executive, HWiNFO64, and CrystalDiskInfo. Note 3: The ssd still has a lot of free space only 111 GB of its 500 GB capacity is occupied. Note 2: After the pc and ssd were about 2 months old, around September, I changed the pc's power profile so it would Never Sleep. That's why only 528 GB have been written to the ssd since Dec 23rd, even though the pc is set to Never Sleep and is always powered on. (Note 1: After RL reached 95%, I took some steps to reduce "unnecessary" writes to the ssd by moving some frequently written files to a hard drive, for example the Firefox profile folder. The latest decrease in RL, from 94% to 93%, occurred after writing only 138 GB in 20 days. Below is the log I began keeping after I noticed RL reached 95% after about 6 months of use.Īssuming RL truly depends on bytes written, the decrease in RL is accelerating and something is very wrong. The Remaining Life (RL) of my Crucial MX500 ssd has been decreasing rapidly, even though the pc doesn't write much to it.
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