CRC can detect the following errors better than check sums.
a) Vertical errors
b) Burst errors
a) VERTICAL ERRORS:
This kind of error happens due to a hardware failure. e.g. the second bit of each character will damage.
b) BURST ERRORS:
When a small set of bits modifies near a specific place due to electric or lighting motor starting nearby etc. then these kinds of errors are known as Burst errors.