My bet, and what the reallocated sector count points to, is that that partitionguru software forces writes to the sectors to make them be remapped.

There is no such thing as repairing a bad sector. Therefore, there is no software doing this.
Poor analogy: it is like a piece of paper that has been written on with a pencil and erased with with rubber eraser in certain spots dozens of times. In those spots that were erased the paper became worn out to a point where you can no longer write reliably and legibly. As result, so that can be done is write in new unused areas on the paper that have not been written to before.

_________________
Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts

There is no such thing as repairing. Only remapping, which is what HDD regenerator attempts to do. Can use this tool for an attempt at drive repair through remapping. Needless to say, not recommended to depend on the drive once remapping has taken place as likely the drive will develop more bad sectors sooner than later.

Type hdd rregenerator in the search function and should come across a study/experiment carried out by lcoughey.

_________________
Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts