ASMedia Technology Inc. Transcend StoreJet 25M3 
usb3 funktioniert nicht
see:   https://bbs.archlinux.org/viewtopic.php?id=183190

lsusb
Bus 002 Device 002: ID 174c:5106 ASMedia Technology Inc. Transcend StoreJet 25M3


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I was able to get my external drive working again by telling the usb-storage module to ignore uas for the device.  Here is how to do it:

First, create a file named ignore_uas.conf in the /etc/modprobe.d directory containing the following*:

 options usb-storage quirks=Vendor_ID:Product_ID:u

*(substitute your actual Vendor_ID and Product_ID obtained from the lsusb -v command).
in this case : options usb-storage quirks=0x174c:0x5106:u

Next, regenerate your inital ramdisk:

# mkinitcpio -p linux

Finally, reboot your computer.

Although this is not a solution to broken uas, at least it will let you use your drive as before

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options usb-storage quirks=0x174c:0x5106:u