Slow Speeds - 1TB Extreme Portable to SanDisk 2TB Extreme PRO

Transferring large number of RAW and JPG image files from a 1TB Extreme to a 2 TB Extreme Pro drive.

2TB Extreme Pro (formatted NTFS and empty) connected to USB 3.2 Gen 2x2 Type-C, 1 TB Extreme USB 3.2 Gen 2.

Using supplied Sandisk cables. Files average around 20MB each - no large video, etc.

93.5 GB took around 45 minutes to transfer - File Explorer shows ~ 32-35 MB/s which I believe translates to 296 MPS.

If correct this is far below the rated speed of both drives - what’s going on?

Try reverting the USB-C cable - worked for me…don’t ask me why.

Do you mean reversing the cable??

Yes, correct - assuming it is USB-C cable - put the end which is in the drive into the computer and vice versa.

I have a 2TB PRO and get those speeds if I use a different cable other than the one supplied. If its not a 10K capable cable I get 45MB/s with the right one I get 1080MB/s. So make sure its the original cable and its in good condition.

Also I would change the device properties in Window Device Manager for ‘Better Performance’ and ‘Enable Write Cache’. Not your issue, but helps speed things up a little.