3 ms·

lsusb will get you this info in Linux, but I like the idea of a little wrapper tool to make the output easier to parse. 480 vs. 5000 Mbps is a pernicious probl

lsusb will get you this info in Linux, but I like the idea of a little wrapper tool to make the output easier to parse. 480 vs. 5000 Mbps is a pernicious problem. It's very easy to plug in a USB drive and it looks like it works fine and is reasonable fast. Right until you try to copy a large file to it and are wondering why it is only copying 50MBytes/second. It doesn't help that the world is awash in crappy charging A-to-C cables. I finally just throw me all away.

lxgr 1y ago
I remember hearing it’s even possible to plug in a USB-A plug too slowly, making the legacy pins make contact first, which results in a 480 Mbps connection – despite the cable, the host, and the device all supporting superspeed!
- lloeki 1y ago
  Can confirm, was victim of this. Couldn't figure out why my 5-disk USB enclosure was so ungodly slow. Quickly I saw that it was capping suspiciously close to some ~40MB/s constant, so 480Mbps. lsusb -v confirmed. As it happened I did some maintenance and had to unplug the whole bay. Since the port was nearly tucked against a wall I had to find the port by touch and insert somewhat slowly in steps (brush finger/cable tip to find port, insert tip at an angle, set straight, push in) but once in place it was easy to unplug and insert fast... This was driving me "vanilla ice cream breaks car" nuts...
- andrewmcwatters 1y ago
  Destroy the whole standard. That's literally insane.
  - lxgr 1y ago
    That's the price of strong backwards compatibility. Otherwise, you wouldn't be able to use a USB 3 (superspeed) device on a USB 3 host port with a USB 2 cable at all. And if you hate this, you should probably never look into these (illegal by the spec, but practically apparently often functional) splitters that separate the USB 2 and 3 path of a USB 3 capable A port so that you can run two devices on them without a hub ;)
    - andrewmcwatters 1y ago
      What in the world…

lxgr 1y ago

I remember hearing it’s even possible to plug in a USB-A plug too slowly, making the legacy pins make contact first, which results in a 480 Mbps connection – despite the cable, the host, and the device all supporting superspeed!

lloeki 1y ago
Can confirm, was victim of this. Couldn't figure out why my 5-disk USB enclosure was so ungodly slow. Quickly I saw that it was capping suspiciously close to some ~40MB/s constant, so 480Mbps. lsusb -v confirmed. As it happened I did some maintenance and had to unplug the whole bay. Since the port was nearly tucked against a wall I had to find the port by touch and insert somewhat slowly in steps (brush finger/cable tip to find port, insert tip at an angle, set straight, push in) but once in place it was easy to unplug and insert fast... This was driving me "vanilla ice cream breaks car" nuts...
andrewmcwatters 1y ago
Destroy the whole standard. That's literally insane.
- lxgr 1y ago
  That's the price of strong backwards compatibility. Otherwise, you wouldn't be able to use a USB 3 (superspeed) device on a USB 3 host port with a USB 2 cable at all. And if you hate this, you should probably never look into these (illegal by the spec, but practically apparently often functional) splitters that separate the USB 2 and 3 path of a USB 3 capable A port so that you can run two devices on them without a hub ;)
  - andrewmcwatters 1y ago
    What in the world…