It sounds like you're looking for a useful document (paper/guide) related to the URescue 2013 tool — specifically for working with its .rar update format (likely toolrar upd refers to updating the tool via a RAR archive).
As there's no specific mathematical problem or detailed software issue provided, it's challenging to offer a precise solution in the format you requested ($$ syntax for mathematical expressions). urescue 2013 format toolrar upd
If you want, I can:
EaseUS Partition Master: A user-friendly all-in-one tool for formatting, partition recovery, and repairing bad sectors. It sounds like you're looking for a useful
Fixing RAW File Systems: Converting drives that are no longer recognized with a compatible file system like FAT32 or NTFS. urescue 2013 format toolrar upd