> sudo dd if=/dev/sdX of=/dev/null

That works without error. Slightly under 20MB/s in case that's of  
interest.

Interestingly, Linux mounts the device (complaining it wasn't cleanly  
unmounted.) That might have been the case all along -- I'm not sure I  
tried accessing it from Linux after the oops. Or perhaps the aborted  
Disk Utility repair attempt fixed it enough for Linux to mount. One  
other thing I did was run a data recovery program under Mac OS, but I  
believe it didn't write to the device.

I've installed current hfsprogs (332.14-1) -- this segfaults shortly  
after starting. Presumably due to the invalid superblock? I haven't  
filed a bug against hfsprogs yet.

One other thing I've tried is running 'find' on the mounted device.  
I'm getting "Input/output error" on a couple of directories, and  
dmesg reports "hfs: walked past end of dir" once. 'find' is still  
running at the moment, I'll follow up if other interesting things  
happen.

Cheers
Rob

-- 
hfsplus oops, corrupted file system
https://bugs.launchpad.net/bugs/202595
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