Hello,
I'm experiencing a problem I'm not able to troubleshoot.
I own a WD Elements Portable USB 3.0 HDD (WDBU6Y0020BBK) containing a
drive model WD20NMVW-11AV3S3. When connected to a USB 3.0 port the drive
works perfectly fine until I try to stop and detach the drive from the
system, either with gnome-disk-utility or udisksctl: it stops spinning
but it restarts soon after and reattaches itself to the system again.
The problem does not occur when using a USB 2.0 port and does not occur
under Windows 10 with both USB 2.0 and 3.0, spinning down and modifying
the led activity accordingly, as expected.
I'm not sure whether the problem is a non compliant USB-Sata bridge
(probably a JMicron) or bad timing, bad FSM implementation or something
else, but I would like to determine the cause to either solve the
problem or steer away from this vendor in the future. Please note the
this issue is not distribution specific and is affecting a lot of people
and other manufacturers as well, e.g.:
https://bugzilla.novell.com/show_bug.cgi?id=922634
https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/792085
https://bugzilla.redhat.com/show_bug.cgi?id=1278944
Here you can find a few captures with Wireshark on both Ubuntu Linux
(3.13.0 & 4.4.0) and Windows 10:
https://drive.google.com/open?id=0B2tgr9hETOtgbVFvdExQZkpTQmc
However USBPcap for Windows cannot capture a bunch of relevant messages,
so there is almost nothing to see when detaching. Under Linux, USB 3.0
seems to be chattier than 2.0 after the SCSI START STOP UNIT command.
Any suggestion on how to investigate the issue is very welcome.
Thank you,
Regards
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