I am trying to copy some > 2GB data from transcend drive (4gb) to internal
harddisk
The copy rate keeps at 700 KB/s and nothing more. This was not the case earlier.
current version:
$ uname -a
Linux srikanch-lnx 2.6.32-26-generic #48-Ubuntu SMP Wed Nov 24 09:00:03 UTC
2010 i686 GNU/Linux
$ sudo lsusb -v -s 2:8
Password or swipe finger:
Bus 002 Device 008: ID 8564:1000
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x8564
idProduct 0x1000
bcdDevice 11.00
iManufacturer 1 JetFlash
iProduct 2 Mass Storage Device
iSerial 3 44E4PU5Q75MIOXR0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk (Zip)
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 255
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 255
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
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https://bugs.launchpad.net/bugs/541937
Title:
Copying files to USB flash drive is extremely slow
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