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Windows 7: USB Hubs and Devices

09 Nov 2010   #11
alphanumeric

Windows 10 Education 64 bit
 
 

Quote   Quote: Originally Posted by walkerdrive View Post
So you are saying the devices are already running at their optimum speeds?
Yes I believe so.


My System SpecsSystem Spec
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09 Nov 2010   #12
walkerdrive

Windows 7 Enterprise 64bit
 
 

Okay then. If anyone knows more about this issue please speak up, otherwise I'll let it rest.

Thanks for the help!
My System SpecsSystem Spec
10 Nov 2010   #13
walkerdrive

Windows 7 Enterprise 64bit
 
 

I plugged a USB 2.0 external hard drive (seagate portable) and it was attached to the high-speed USB root hub so I guess it works. I'm just wondering why the sound card doesn't work at high-speed since I'd assume it requires a lot of bandwidth to function properly.

I have one question though. When I plugged in the hard drive and was backing up my data, the average speed was between 19 and 25MB/s. Since USB 2.0 allows for 480Mb/s which is 60MB/s, I was wondering why isn't the transfer speed higher? I'm transferring from a WD Raptor 10K RPM HD which is SATA I. Any ideas?
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11 Nov 2010   #14
alphanumeric

Windows 10 Education 64 bit
 
 

Well I did some more reading and it appears USB 2.0 can be certified as Full speed or High speed and still be called or advertised as USB 2 certified. Same thing with USB devices so now I'm getting confused. Too the OP, I guess you have to read the fine print for your devices specs to see what the fastest USB speed they support is and go from there. It looks like Full speed isn't much better than USB 1.1 speeds. Also the quoted speeds are the theoretical maximum so you aren't likely ever to get 480 Mbs and if you do it will only be for short bursts. I'm not 100% sure on this but I believe the USB ports connect to the hubs in groups of two. If one of the ports has a USB device running at a lower speed it may be that both ports on that hub will run at the lower speed. I've never sat down and tried to prove it but I do group my devices so one won't interfere with the other. My keyboard and mouse for instance are on two adjacent ports. My DVD burner and external drive are on two other adjacent ports, etc.
My System SpecsSystem Spec
11 Nov 2010   #15
walkerdrive

Windows 7 Enterprise 64bit
 
 

Yeah, with the hard drive I wasn't expecting to get 60MB/s but 20MB/s is pretty bad. That's 1/3 the theoretical speed. I was hoping to get more like 35MB/s+.
My System SpecsSystem Spec
11 Nov 2010   #16
alphanumeric

Windows 10 Education 64 bit
 
 

I've never tested the data transfer speed of my external drive. It's not painfully slow so I just accept that it is what it is. If I did test it, it would probably just depress me to know what the true speed is. Mine is just a spare ATA-100 IDE drive I had kicking around after upgarding to a SATA II drive in my PC.
My System SpecsSystem Spec
11 Nov 2010   #17
tw33k

Windows 7 Ultimate (x64) SP1
 
 

My USB 2.0 external:

USB Hubs and Devices-wd_usb2.0_2.png


My System SpecsSystem Spec
12 Nov 2010   #18
walkerdrive

Windows 7 Enterprise 64bit
 
 

You don't have to test it. You can just click on "details" in the file transferring box while you're transferring files and it will show you the current speed.
My System SpecsSystem Spec
12 Nov 2010   #19
alphanumeric

Windows 10 Education 64 bit
 
 

Ah, OK, I'll try to remember that the next time I'm using it.
My System SpecsSystem Spec
12 Nov 2010   #20
Phone Man

Windows 8.1 Pro w/Media Center 64bit, Windows 7 HP 64bit
 
 

Right click on each USB Root Hub, select Properties and under Power it will show what is connected and then click on Advanced and it should show the speed. Full-Speed is 1.1 and High-Speed is 2.0

USB supports the following signaling rates:
  • A low-speed rate of 1.5 Mbit/s (~183 kB/s) is defined by USB 1.0. It is very similar to "full-bandwidth" operation except each bit takes 8 times as long to transmit. It is intended primarily to save cost in low-bandwidth human interface devices (HID) such as keyboards, mice, and joysticks.
  • The full-speed rate of 12 Mbit/s (~1.43 MB/s) is the basic USB data rate defined by USB 1.1. All USB hubs support full-bandwidth.
  • A high-speed (USB 2.0) rate of 480 Mbit/s (~57 MB/s) was introduced in 2001. All hi-speed devices are capable of falling back to full-bandwidth operation if necessary; they are backward compatible. Connectors are identical.
  • A SuperSpeed (USB 3.0) rate of 4800 Mbit/s (~572 MB/s). The written USB 3.0 specification was released by Intel and partners in August 2008. The first USB 3 controller chips were sampled by NEC May 2009 [47] and products using the 3.0 specification arrived beginning in January 2010.[48] USB 3.0 connectors are generally backwards compatible, but include new wiring and full duplex operation. There is some incompatibility with older connectors.


Jim
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