Hi François,
the usb/disk_detect test checks if the partitions are mounted (usb_test
-l).
usb_test -t is used by usb/storage_transfer, and although the purpose is
a bit vague ("This test will check your USB connection."), as Brendan
mentions, we want to test that the drive can be written to without the
data getting corrupted. If we're unable to write to it, we don't know
either way, so the safe thing to do is assume something is amiss and
fail the test. Either that, or we add a long list of heuristics to
catch, for instance, the cases you mention, among others.
I agree with your idea about doing a read-only test, if we can do that
without i/o errors we could take the drive to be good. But yes,
detecting whether a partition is writable and doing read/write or read-
only tests accordingly would be the most thorough way to test this.
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https://bugs.launchpad.net/bugs/912522
Title:
usb_test fails on non-writable filesystems
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