The corruption I was getting was not merely "one or two bits" but rather a hole in the OGG file big enough to cause an audible "skip" in the playback—large enough to believe it was a whole block disappearing from the filesystem. Also, the discussion of write barriers came up; I have noatime,data=ordered,barrier=1 as mount options for this filesystem in my /etc/fstab file—I'm pretty sure those are the "safe" defaults (but I could be wrong).
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