Why so many ups and downs in speed transfer from SSD to HDD

Started 5 months ago | Questions thread
Timur Born
Timur Born Veteran Member • Posts: 4,972
Re: Why so many ups and downs in speed transfer from SSD to HDD
  • The higher the number of files and the smaller the files the longer it takes. Try to copy the same files from SDD to SDD (can be same drive) to see how that behaves in comparison.

This is copying only 580 mb of files for a second time (all data already in cache) on a PCIe 3.0 M.2 drive. The drive can sustain over 3000 mb/s for single large files.

  • Windows cache might be disabled for one of the drives.


  • With several GB of data Windows cache could be full every time you see a drop, so it has to catch up and wait for former writes to be finished.
  • The HDD could be fragmented, albeit that would usually not lead to such periodic waves.
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