On Fri, 21 Nov 2014, Christoph Hellwig wrote:
usb-storage sets wce_default_on only for devices that are marked with
the US_FL_WRITE_CACHE quirk flag. Currently only two devices have that
flag: the Seagate Portable HDD (vendor ID 0x0bc2, product ID 0x2300)
and the Western Digital My Password HDD (vendor ID 0x1058, product ID
0x070a).
So Jeff has a drive that on its own claims WCE=1 but doesn't support
SYNCHRONIZE_CACHE(10). I'm not sure what to do about it as it sounds
inherently dangerous.
Maybe we should log a one-time warning when this happens and turn off
sdkp-WCE. There's not much else we _can_ do about it.
Alan Stern
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