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USB HD enclosure "sleeps", file system errors ensue, can't remount, device disappears. Help interpreting these logs?

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http://askubuntu.com – I am using this enclosure over USB2 with Ubuntu 11.10: http://www.newegg.com/Product/Product.aspx?Item=N82E16817173042 After a period of inactivity, the enclosure seems to sleep and Ubuntu isn't able to wake it. I have confirmed that the internal drive is working (no bad blocks, etc). Furthermore, in Windows when the enclosure sleeps it seems as though Windows is able to wake it upon accessing the drive. In Ubuntu I only get I/O errors when accessing the mount point. The relevant portion of syslog is shown below. Can someone tell me if this confirms my thoughts above? What should I do? Mar (HowTos)