USB 3.2 running at 90 Mbps - DPChallenge Forums

Samsung Galaxy S21, S21+, S21 Ultra

04/13/2024 01:45:37 AM · #1

I cannot understand it. I have WD Passport external drive supporting USB 3.2 Gen 1 and USB 3.2 Gen 2 port on the PC, when I transfer files from PC to Passport I cannot get higher speeds than 90 Mbps, why? Any ideas?

Message edited by author 2024-04-13 01:45:57.

Bear_Music

Sony 24-70mm F4 Vario-Tessar T* FE OSS

04/13/2024 08:20:01 AM · #2

What comes to mind immediately is "not all cables are created equal", so be sure the one you're using is designed for high-speed data transfer.

vawendy

Sony Alpha 1

Sony FE 200-600mm f/5.6-6.3 G OSS

04/13/2024 10:12:06 AM · #3

Originally posted by Bear_Music on 2024-04-13 said::

What comes to mind immediately is "not all cables are created equal", so be sure the one you're using is designed for high-speed data transfer.

exactly what I was going to say. I had no idea that I was using a slow cable or there was such a thing as a fast cable. makes a huge huge difference.

Olympus OM-D E-M5 Mark III

04/13/2024 11:32:15 AM · #4

Thanks but I am using the cable that came with WD Passport.

I just discovered that my new Samsung NVMe transfers at 45 Mbps when connected to USB 3.2 Type C but gets to 350 Mbps on USB 3.2 Type A so I started to wonder about the differences between ports. Maybe that's the problem?

kirbic

Canon EOS R5

Canon RF 24-70 f2.8 L IS

04/13/2024 11:51:51 AM · #5

Are you really only getting 90 Mbps (megabits per second) or are you seeing 90 MBps (megabytes per second)? My other question is, is the Passport drive an SSD or a rotating drive?

Yo_Spiff

Olympus 12-100mm f/4.0 M.Zuiko ED IS PRO

04/13/2024 12:27:41 PM · #6

I agree there is some bottleneck and the cable is the most likely variable. Are all the ports connected to the same bus? Maybe a hub is slowing it down from the theoretical max. Perhaps they are not all getting the date transferred through the same path.

Message edited by author 2024-04-13 12:28:19.

04/13/2024 12:29:51 PM · #7

Passport is a rotating drive. Apart from transfer speed I can see the time it takes and they are synched, I mean slow transfer takes longer. For reference, I was transferring the same files each time for comparison.

Samsung is an SSD on a chip so I think there is something happening with the ports but I don't know if it is something I can fix or they are simply different.

04/13/2024 12:32:44 PM · #8

Originally posted by Yo_Spiff:

I am not using a hub, in all cases they are connected directly using supplied cables but to different ports.

PS I will have to check drivers on buses.

kirbic

Canon EOS R5

Canon RF 24-70 f2.8 L IS

04/13/2024 04:50:34 PM · #9

If the Passport is a rotating drive, then a speed of 90 MB/s (megabytes per second) makes sense. You are not going to write much faster than that to a rotating drive.
Read/write speeds to/from an SSD are highly dependent on the characteristics of the device.