Bad media (Was: Need Kermit for Xerox 820-II in .IMD format

I remember manufacturers selling SS and DS 5.25" disks for commodorethat were actually all DS, just a disk notcher away from double the storage. as for the 486SX (or was it 386SX) debacle, there was software thatcould completely restore functionality.I think it was called above-board, which had hardware as well as software,but on many SX type systems it was just software Actually if I remember correctly it was the 486SX CPUs made by AMDthat could be "converted" into a 486DX by a simple piece of software.there were a bunch of tricks with software around those days likethe AMD 486DX-80 and so forth this practice is continued to present with cpu cores being disabled,even though there may be nothing wrong with them. for commodore 64 again there was a utility called "soft sector format"which would format disks that had bad sectors, marking the bad sectorsso you could use whatever good portions remained, for those of us whowere too cheap to buy new/good disks.