TSGUI should have the option to read sector by sector in the menu. IIRC it even allows to switch to sector-by-sector mode once it encounters an error in a cylinder.
In certain cases an error occurs in regular distances. For example if a whole platter is damaged, an error occurs every 200 sectors or so. For such cases TSGUI has the option to skip a number of sectors in regular intervals. I implemented this because the IDE controller of my A4000 locks dead when it encounters a real read error and I have to reboot to continue. That can be very annoying.
There is also a restart option which fills in all the gadgets as they were before the reboot.
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