Is it safe to run 2 versions of CCleaner to permanently delete data from disks?

Question

Iron

There are several hdds installed in the computer, you need to erase all the information before selling it. I put Gautman on 1 TB (35 passes), so it takes about 4 days. Is it possible to run 1-2 more versions of CCleaner in parallel and run cleaning on other drives?

Answer 1

The number of overwrites according to Gutman is too much for modern discs, with their recording density many times greater than that of the models of the early years, when this very Gutman was relevant.