I have some older game CDs. Even though they are copyrighted, I understand that I am allowed to make a copy to back them up in case one gets worn out or damaged.
Does anyone know of any software that will make a bit-for-bit copy of a CD?
Software Recommendations Stack Exchange is a question and answer site for people seeking specific software recommendations. It only takes a minute to sign up.
Sign up to join this communityI have some older game CDs. Even though they are copyrighted, I understand that I am allowed to make a copy to back them up in case one gets worn out or damaged.
Does anyone know of any software that will make a bit-for-bit copy of a CD?
I would use Nero or a similar program to make an .iso file that should be exactly what is written on the CD, then use Virtual Clone Drive to run that .iso file from your hard drive, emulating a CD.
This can be useful when they intentionally make a CD have an non-standard section as a copy-protection mechanism. This has worked for me on CD's that I could not burn a new copy (either disk-to-disk or from the intentionally malformed .iso). It seems like the burning software chokes on writing the malformed section, but the CD emulator reading the .iso doesn't care.
If there is a flaw in this approach, it would be a question of whether the software was willing to write the malformed .iso file. I think it works based on my experiences, but you will have to see for yourself.
With copy-protected CDs this will generally be impossible because the copy protection schemes were designed specifically to make it impossible. Examples of things they did:
The simplest trick was to include some bad sectors on the disc, and refuse to run if reading those sectors succeeded. Consumer CD burners generally don't support writing bad sectors.
CD-ROM includes a scrambling step where the raw data is xored with pseudorandom bits in order to minimize the chance that the data actually written to disc will include certain bit patterns that were difficult for consumer drives to write. Since the pseudorandom bit sequence is always the same, you can construct sectors that always scramble to those bit patterns, so burning a copy on a consumer drive is likely to fail.
I think some schemes used the timings of sector reads to measure the relative angle of certain sectors on the disc. With recordable CDs you have no control over the angular placement of the sectors.
Your options in these cases are probably limited to finding a cracked ("No-CD") executable, re-buying the game on GOG if available, or using an emulated CD drive.
In some cases making physical copies may be possible: