What should the sd driver do when it gets the error in the subject line? Try again, and again, and again, and again ...? sd 2:0:1:0: [sdb] Unaligned partial completion (resid=3584, sector_sz=4096) sd 2:0:1:0: [sdb] tag#407 CDB: Read(16) 88 00 00 00 00 00 00 00 00 00 00 00 00 01 00 Not very productive, IMO. Perhaps, after say 3 retries getting the _same_ resid, it might rescan that disk. There is a big hint in the logged data shown above: trying to READ 1 block (sector_sz=4096) and getting a resid of 3584. So it got back 512 bytes (again and again ...). The disk isn't mounted so perhaps it is being prepared. And maybe that preparation involved a MODE SELECT which changed the LB size in its block descriptor, prior to a FORMAT UNIT. Another issue with that error message: what does "unaligned" mean in this context? Surely it is superfluous and "Partial completion" is more accurate (unless the resid is negative). Doug Gilbert
