[Bug 216282] usb-mass storage

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216282

--- Comment #8 from Alan Stern (stern@rowland.harvard.edu) ---
Some of the things you wrote above are not correct.  "When you Turn-on the
USB3.0 to SATA controller, electrons travel near the speed of light."  Not true
at all; electric waves travel near the speed of light but the electrons
themselves move at only a few centimeters per second (bulk motion).

Anyway, the information you reported doesn't indicate what's going wrong.  I
don't think it's simply a matter of waiting for the disk to spin up; the
commands sent by the kernel have a 30-second timeout and that should be plenty
of time.

A usbmon trace of a non-working connection should help.  Before you plug in the
USB cable, do:

   cat /sys/kernel/debug/usb/usbmon/2u >mon.out

Then after the drive has been plugged in and the drive has failed to appear,
kill the "cat" process with ^C and attach the mon.out file to this bug report.

In fact, you might want to do this twice: once where the drive doesn't work,
and once where it does work, for comparison.

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