[issue563] strange bug with USB hdd

[Matthew Dillon]

    A data phase error is typically an indication of a bad cable.

    A bad block is usually an indication of a bad block on the hard drive.
    It is possible that bad blocks are being reported due to the
    cabling/protocol issue but not likely.  One major side effect of a 
    bad block error is that the drive may report old data for the contents
    of the block, leading to corruption.

    The VM fault is a software bug in the kernel, but it could be related
    to the cable/protocol errors.

    I will run some life-testing between two USB drives.

    Are these drives connected via UHCI or EHCI?  Post your dmesg output
    after booting is complete.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>