Way to continue image backup? (Data error (cyclic redundancy check))

You could always use the primitive old-school approach, CHKDSK /R which should mark the bad spot not to be used. I can’t say for UrB but every other imaging solution I’ve tried copes then.

Re-running CHKDSK afterwards with the /B switch (re-evaluate any sectors maked bad) may induce such a write.

Writing zeros to only one sector is doable with Linux, you’d use fsck or badblocks to identify the block then use dd with appropriate values for bs (blocksize) skip (how far up the drive) and count=1 (only write one block)

Personally I’d avoid the chance of errors in the above Linux operation, & simply sacrifice one write cycle per cell… use a drive wipe utility, one pass, and restore most recent backup, yes you write zeros to all sectors, but you get the one you need, assuming the two passes with CHKDSK didn’t sort it that is.