The current script expects to find cpm3.sys and cpmldr to patch before it considers writing the DPB to the boot sector. Non-bootable data only disks might not have them but would still benefit from the DPB, which would be picked up if the patched CP/M 3 was booted.
After this is relaxed more care should be taken before writing to the end of the boot sector. Currently 0xE5 filler or a decrementing byte pattern is likely safe, and other cases should be refused unless forced.
simonowen
commented
8 months ago
The current script expects to find cpm3.sys and cpmldr to patch before it considers writing the DPB to the boot sector. Non-bootable data only disks might not have them but would still benefit from the DPB, which would be picked up if the patched CP/M 3 was booted.
After this is relaxed more care should be taken before writing to the end of the boot sector. Currently 0xE5 filler or a decrementing byte pattern is likely safe, and other cases should be refused unless forced.