nstring
dname op dsize offset position lba errno
ustring
= executable program or script.
udname
= The device or file name.
uop
= The operation in error.
udsize
= The device size.
uoffset
= The 64-bit file offset.
uposition
= Position in block of DC.
ulba
= The logical block address (real or
relative)
uerrno
= The error number.