On Mon, 25 Apr 2005, Erik Tews wrote: > Hi > > I bought a USB storage device and it is painfully slow. The device was > sold as an USB 2.0 device, but it seems to me that it looks like an USB > 1.x device. > > Here is the lsusb output with only the device plugged in, can somebody > confirm that this is just a 1.1 device?
The information in /proc/bus/usb/devices is generally easier to read, because it's more compact. > ############# Device starts here ################ > > Bus 002 Device 004: ID 10d6:1100 Actions Semiconductor Co., Ltd > Device Descriptor: > bLength 18 > bDescriptorType 1 > bcdUSB 1.10 > > ########## Looks like USB 1.1, does it? ############### Yup, it sure does. No question, this is a USB 1.1 device. > bDeviceClass 0 (Defined at Interface level) > bDeviceSubClass 0 > bDeviceProtocol 0 > bMaxPacketSize0 8 > idVendor 0x10d6 Actions Semiconductor Co., Ltd > idProduct 0x1100 > bcdDevice 1.00 > iManufacturer 0 > iProduct 1 USB 2.0(FS) FLASH DISK > iSerial 2 USB 2.0(FS) FLASH DISK > > ###### this says USB 2.0, but this String can be changed by the vendor, or? > ##### That's right, the string is set by the vendor. Note that it only claims to be full speed (FS), however. That's not inconsistent, by the way; it's perfectly legal for a USB-2.0 device not to support high-speed operation. There was another case reported recently, just like yours. The manufacturer claimed the device was USB-2.0 but the descriptors said otherwise. I don't remember the vendor or the device, but maybe you can find out by searching through the mailing list archive. Alan Stern ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
