The initial normalised attribute values of 253 obviously reflect the initial state of a virgin drive. It is only after the drive has begun seeking and reading and writing that enough statistical data are accumulated in order for these attribute values to become meaningful. In short, there is nothing wrong.
As for the CHKDSK error, it appears that there was an inconsistency between the drive's actual free space and the map of free clusters in the $BITMAP metafile. NTFS relies on the information in the $BITMAP to allocate disc space to new files, and it also updates the $BITMAP after deleting files.http://en.wikipedia.org/wiki/NTFS
In short, I see nothing to worry about.
BTW, "WD10JMVW-11S5XS0" is the model number of the drive within the enclosure whereas "WDBBEP0010BBK-EESN" is the model number of the complete external product.