Comment # 15 on bug 1021325 from Oliver Neukum

(In reply to Tony Mechelynck from comment #13)
> During boot, I see "A start job is running" for both USB disks, displaying
> in alternation. After the X11 logon screen appears, I went back to try to
> login on /dev/tty2 and saw error messages interspersed with what I normally
> see when logging in. Since they are on a text (non-X11) console, I cannot
> copy-paste them, I'll try copying them by eyeball (omitting the timestamps;
> the integer part of their timestamps, which I'm omitting, ranges from 168 to
> 189).
> 
> usb 6-2: device descriptor read/64, error -110
> usb 6-2: new full speed USB device number 8 using uhci_hcd
> usb 6-2: device descriptor read/8, error -110
> usb 6-2: device descriptor read/8, error -110
> usb 6-2: new full speed USB device number 9 using uhci_hcd
> usb 6-2: device descriptor read/8, error -110
> usb 6-2: device descriptor read/8, error -110
> usb usb6-port2: unable to enumerate USB device

Something is fishy. Are your disks USB 2.0?
And the log is different from comment#10

Please clarify