Slow SATA III 600 (6gb) File Transfer Speeds

Important Drivers General: Storage Drivers (AHCI/RAID, NVMe and USB)
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@DeathStalker
Thanks for your detailed reply.
To be able to help you I need more information:

  1. Which internal disk drives (model names of the HDDs/SSDs) are connected to which mainboard connectors?
  2. Which disk drive contains the OS (drive C:) and the boot sector (usually hidden drive)?
  3. When (at which situation) have the Intel SATA AHCI Controllers been moved within the Device Manager from the “IDE ATA/ATAPI Controllers” into the “Storage Controllers” section?
  4. Which is the purpose of the “LSI Adapter, SAS2 2308 Mustang v2.0.79.82” and which device(s) are connected to it?

No, I have never used a mainboard with an Intel Rapid Storage “Enterprise Edition” (RSTe) chipset.