This is the output for my 3,5" USB hard disk which has its own power cord:
azr...@laptop:~$ sudo lsusb -vv -d 04b4:6830
[sudo] password for azrael:
Bus 001 Device 006: ID 04b4:6830 Cypress Semiconductor Corp. CY7C68300A EZ-USB
AT2 USB 2.0 to ATA/ATAPI
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x04b4 Cypress Semiconductor Corp.
idProduct 0x6830 CY7C68300A EZ-USB AT2 USB 2.0 to ATA/ATAPI
bcdDevice 0.01
iManufacturer 56 Cypress Semiconductor
iProduct 78 USB2.0 Storage Device
iSerial 100 DEF10000BC41ACB
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 0mA
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 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x86 EP 6 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
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: 0x0001
Self Powered
I guess the last line is the thing that you are looking for.
--
"Unmount" in volume right-click menu, is tech-speak and undiscoverable
https://bugs.launchpad.net/bugs/28835
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