USB-C port is only transferring data at SATA speeds...Acer Aspire 5 A515-44-

Spamalot
Spamalot Member Posts: 10

Tinkerer

edited October 2023 in 2020 Archives
I recently purchased an Acer Aspire 5 A515-44-r41b.  I replaced the 256 GB hard drive with a 1 TB NVMe m.2 drive, and added a 500 GB SATA SSD drive.  I also added 8 GB of DDR4 memory.  Using the original 256 GB SSD in an portable enclosure (rated for USB 3.1 Gen 2) with a USB-C cable rated at 40 GB/s (as well as another USB-C 3.1 cable rate at 10 GB/s), my data is transferring at SATA speeds.  Benchmarks are showing no transfers faster than 400 MB/s.  Any thoughts?  Thank you in advance.


Thread was edited to add model name to the title



Answers

  • JackE
    JackE ACE Posts: 44,889 Trailblazer
    Sorry. Your USBC is gen1 rated at 5Gbps max or about 500MBps. Sounds like it's working well. Jack E/NJ






    Jack E/NJ

  • Spamalot
    Spamalot Member Posts: 10

    Tinkerer

    JackE said:
    Sorry. Your USBC is gen1 rated at 5Gbps max or about 500MBps. Sounds like it's working well. Jack E/NJ



    Okay.  Now I am a little confused.  When it says Gbps, is it talking about gigabits or gigabytes?  I was under the impression it was gigabytes, which would be 5,000 megabytes.  Among other things, why would manufacturers be advertising transfer rates of 3,500 MB/s?  Or, am I missing something (a very likely possibility)?



    To add a bit more to this.  USB 2.0 transfer rates can reach 480 Mb/s.  I would expect USB 3.1 to exceed that more substantially than a mere 20 Mb/s.  That said, after dong more research, I have a suspicion the problem exists in the controller of the NVMe m.2 enclosure I am using.  I have ordered a new one with a Realtek controller.  I will post the results.
  • JackE
    JackE ACE Posts: 44,889 Trailblazer
    Lower case 'b' is a bit. Upper case "B" is a byte. Approximately 10 bits to a byte. So USB2 speed at 480Mbps is about the same as 48MBps. You don't have a problem. Jack E/NJ

    Jack E/NJ