The /R option can also often fail, depending upon how many sectors have already been reallocated on this disk. My 2TB 7200 RPM disk went out recently as well; and the /R option failed. So instead, I did a full reformat (not a quick reformat) (based on a recommendation I saw online), and then ran CHKDSK and it seems to be fine now. Nevertheless, it is no longer my boot drive and I just use it for intermediate storage, but so far so good. And yes, that whole process took a very long time to complete.


John

Laptop-HP Omen I7 Win11Pro 32GB 12TB SSD
Desktop-ASUS-I7 Win10Pro 32GB 12TB SATA

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