What can be the reason of limited to 30MB/s write speed to Crucial M4-CT128 SSD drive on Windows 10. Disk was before in different laptop with Win7 achieving higher write speeds. I noticed that after firmware upgrade, next test achieved higher speeds, but after system restart (I believe) write speeds came back to ~30MB/s

  • TRIM support enabled
  • interface SATA III
  • enabled AHCI
  • latest SSD Firmware
  • enabled write caching on the device
  • enough free space for test (about 99GB)
  • partition aligned

Benchmark: ATTO

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Benchmark: AS SSD

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  • 1
    You don't mention if you are connecting the drive to a SATA III port or not. Windows 10 automatically enables TRIM when it detects a SSD, so I very much doubt, it has anything to do with TRIM not being enabled. In reality the drive is in general slow compared to other SSDs on the market. You are actually getting very close to the average write speed of that device. What tool did you use to benchmark this drive? – Ramhound Nov 18 '15 at 13:48
  • also post a picture of AS SSD Benchmark: alex-is.de/PHP/fusion/downloads.php?cat_id=4&download_id=9 – magicandre1981 Nov 18 '15 at 18:22
  • @Ramhound: please see completed details. – Tomek Nov 18 '15 at 23:51
  • @magicandre1981: included test from AS SSD, didn't have patience to wait for test to run completely – Tomek Nov 18 '15 at 23:52
  • is this the latest firmware for the M4 SSD? – magicandre1981 Nov 19 '15 at 5:33

You have to TRIM your drive, which evidently is in a full-used state (here you can find some related benchmark)

You can use trimcheck to be sure that TRIM is enabled, and follow these suggestions to trigger a full freespace TRIM.


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