Are external USB drives on separate USB buses faster?

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Is there a speed difference between when lsusb shows that two external USB HDDs are on the same bus versus when they are on different buses?




usb external-hdd lsusb




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    Is there a speed difference between when lsusb shows that two external USB HDDs are on the same bus versus when they are on different buses?




    usb external-hdd lsusb




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      Is there a speed difference between when lsusb shows that two external USB HDDs are on the same bus versus when they are on different buses?




      usb external-hdd lsusb




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      Is there a speed difference between when lsusb shows that two external USB HDDs are on the same bus versus when they are on different buses?





      usb external-hdd lsusb





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      asked Apr 2 at 4:14









      Geremia

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          1 Answer
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          Each USB bus has a certain transport bandwidth, and if you max out that bandwidth, two devices on the same bus will have to share it, slowing down each of them, while two devices on different busses with separate root controllers won't have to share it.



          So the answer is: it depends.



          Do you ever use both HDDs at once? What's the maximum I/O speed of the HDDs? What kind of USB bus is it?






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          • "two devices on different busses with separate root controllers" How do I determine if the root controllers are different? "Do you ever use both HDDs at once?" Yes.
            – Geremia
            Apr 2 at 17:47











          • Look at lsusb -t.
            – dirkt
            Apr 2 at 18:24










          • It appears they're all part of "Class=root_hub".
            – Geremia
            Apr 2 at 22:16










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          Each USB bus has a certain transport bandwidth, and if you max out that bandwidth, two devices on the same bus will have to share it, slowing down each of them, while two devices on different busses with separate root controllers won't have to share it.



          So the answer is: it depends.



          Do you ever use both HDDs at once? What's the maximum I/O speed of the HDDs? What kind of USB bus is it?






          share|improve this answer




















          • "two devices on different busses with separate root controllers" How do I determine if the root controllers are different? "Do you ever use both HDDs at once?" Yes.
            – Geremia
            Apr 2 at 17:47











          • Look at lsusb -t.
            – dirkt
            Apr 2 at 18:24










          • It appears they're all part of "Class=root_hub".
            – Geremia
            Apr 2 at 22:16














          up vote
          1
          down vote













          Each USB bus has a certain transport bandwidth, and if you max out that bandwidth, two devices on the same bus will have to share it, slowing down each of them, while two devices on different busses with separate root controllers won't have to share it.



          So the answer is: it depends.



          Do you ever use both HDDs at once? What's the maximum I/O speed of the HDDs? What kind of USB bus is it?






          share|improve this answer




















          • "two devices on different busses with separate root controllers" How do I determine if the root controllers are different? "Do you ever use both HDDs at once?" Yes.
            – Geremia
            Apr 2 at 17:47











          • Look at lsusb -t.
            – dirkt
            Apr 2 at 18:24










          • It appears they're all part of "Class=root_hub".
            – Geremia
            Apr 2 at 22:16












          up vote
          1
          down vote










          up vote
          1
          down vote









          Each USB bus has a certain transport bandwidth, and if you max out that bandwidth, two devices on the same bus will have to share it, slowing down each of them, while two devices on different busses with separate root controllers won't have to share it.



          So the answer is: it depends.



          Do you ever use both HDDs at once? What's the maximum I/O speed of the HDDs? What kind of USB bus is it?






          share|improve this answer












          Each USB bus has a certain transport bandwidth, and if you max out that bandwidth, two devices on the same bus will have to share it, slowing down each of them, while two devices on different busses with separate root controllers won't have to share it.



          So the answer is: it depends.



          Do you ever use both HDDs at once? What's the maximum I/O speed of the HDDs? What kind of USB bus is it?







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Apr 2 at 6:34









          dirkt

          14k2930




          14k2930











          • "two devices on different busses with separate root controllers" How do I determine if the root controllers are different? "Do you ever use both HDDs at once?" Yes.
            – Geremia
            Apr 2 at 17:47











          • Look at lsusb -t.
            – dirkt
            Apr 2 at 18:24










          • It appears they're all part of "Class=root_hub".
            – Geremia
            Apr 2 at 22:16
















          • "two devices on different busses with separate root controllers" How do I determine if the root controllers are different? "Do you ever use both HDDs at once?" Yes.
            – Geremia
            Apr 2 at 17:47











          • Look at lsusb -t.
            – dirkt
            Apr 2 at 18:24










          • It appears they're all part of "Class=root_hub".
            – Geremia
            Apr 2 at 22:16















          "two devices on different busses with separate root controllers" How do I determine if the root controllers are different? "Do you ever use both HDDs at once?" Yes.
          – Geremia
          Apr 2 at 17:47





          "two devices on different busses with separate root controllers" How do I determine if the root controllers are different? "Do you ever use both HDDs at once?" Yes.
          – Geremia
          Apr 2 at 17:47













          Look at lsusb -t.
          – dirkt
          Apr 2 at 18:24




          Look at lsusb -t.
          – dirkt
          Apr 2 at 18:24












          It appears they're all part of "Class=root_hub".
          – Geremia
          Apr 2 at 22:16




          It appears they're all part of "Class=root_hub".
          – Geremia
          Apr 2 at 22:16












           

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