begin Tuesday 13 January 2004 10:25, Lionel Elie Mamane quote: It all depends on how bad the sectors really are. If there is only a small bad spot on the disk surface, the rest of the sector may still be read ok. The checksum won't match however (because a couple of bytes may be misread), and in that condition the OS usually considers the whole sector as bad, and doesn't give it to the application. Fdutils uses a lower-level API which allows the application to see the data as it came from the floppy disk controller. Once the data is read, the next challenge however, is to deliberately create, on the copy, a disk with the same bad sector... If you are lucky, the copy-protected program may not actually check for the exact error (CRC, sector absent, etc.), but only for the fact that there is an error (no matter which one). In that case, just format a disk (also using fdrawcmd) with that sector missing... If the program really checks for CRC errors, it might be somewhat more difficult. Alain