Slow transfer speeds to USB3 hard drive

[cyber69]

I've noticed when backing up some data that the transfer speed has plummeted to 25MB/s when moving data from my Seagate barracuda pro 4TB sata3 internal disk to a 14TB sata plugged into a USB3 caddy.

I've tried another caddy and the speed is the same also. Tried a 5TB WD passport drive also and the speed starts off at 120MB/s and then plummets to 20MB/s.

Tried moving the same 6GB file to a network storage and it starts off ok and then runs at about 40MB/s over a gigabit connection.

I've checked device manager and everything appears ok, my system is an AMD X570 motherboard with 3700X processor.

In device manager it lists the IDE/ATAPI controllers as standard ahci controller and in the storage controller tab it lists it as a microsoft storage space controller.

PC works fine, no BSOD at all since built and OS runs off NVME drive and games stored on another NVME, downloads stored on the 4TB sata drive.

I've run seatools on the 4TB drive and it passes the tests with one reallocated sector only.

Any idea's please?

 

[cyber69]

3 to 4GB files seem to copy fine over network at 120MB/s but the 4k 12GB files are having an issue with sustained data transfer I think, starts off ok and then the transfer rate plummets.

 

[cyber69]

Enabled write caching for the USB drive and now getting 68MB/s moving 12GB 4k video files to USB3, so a big increase but does it sound about right?

 

[pugheaven]

Enabled write caching for the USB drive and now getting 68MB/s moving 12GB 4k video files to USB3, so a big increase but does it sound about right?

Yeah, I've just tested to a USB 3.0 pen drive and that's around 38-45MB/S using a 6GB film file... I would've thought I'd be hitting higher speeds myself, but that's USB for you

 

[pugheaven]

infact run Crystal DiskMark 7 on it mate and see what it says... so my USB pen drive is hitting the following but when in the real world I was trasnfering that 6GB file now, I maxed at 45MB/s