Snow leopard is doing a 2021 task Mojave and Catalina could not!

[MBAir2010]

While trying to reinstall a time machine version of Mountain Lion (from Catalina)
something happened to the WD external Hard drive.
Mojave saw the disk, but would not verify or repair.
Luckily i still have a Snow leopard OSX ssd card
whew!

 

[SnowLeopardUser9]

Yeah, it's sad how they completely gutted Disk Utility in OS X El Capitan. Mac OS X Snow Leopard forever!