I get this behaviour under windows also.
It seems to be a combination of the USB controller chipset and the USB3toSATA
chipset in the dock/caddy.
Newer devices seem more reliable.
My laptop is a U270 with NEC USB3. Seems alright for USB3 support, had
many cheap caddies not work with it.
I have a Shintaro USB3 caddy which is rock solid.
>From lsusb
"Bus 006 Device 002: ID 174c:55aa ASMedia Technology Inc."
or
/: Bus 06.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
|__ Port 1: Dev 2, If 0, Class=stor., Driver=usb-storage, 5000M
my tests is "md5sum /dev/sdb" and if it completes two times without error then
I classify it as stable.
Some caddies will do one time then fail the second time. Most dodgy ones fail
the first test.
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https://bugs.launchpad.net/bugs/1050352
Title:
External USB 3.0 hard drive randomly disconnects and connects
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