Comment on How come it seems the transfer rate from an hard drive to usb is noticably slower? But a usb to usb is incredibly fast?

DomeGuy@lemmy.world ⁨2⁩ ⁨days⁩ ago

There are four things that matter for transfer speed between storage devices.

  1. How fast the source reads
  2. How fast the target writes
  3. How fast the bits can be moved between them
  4. What post-write nonsense is done.

USB sticks tend to be flash memory with relatively equal read and write speeds, but the spinning disks in a hard disk drive are noticeably unequal. So, unless the USB is very slow, you’d expect a USB to HDD copy to be slower than either USB to USB or HDD to USB.

You can also be slowed down by antivirus scans, on-disk encryption, search indexing, or even the need to move bits from the USB bus to the HDD controller.

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