the recommended speed of burning kali-linux-1.0.6-i386.iso on a DVD

Hello,
Please what's the best speed of burning kali-linux-1.0.6-i386.iso on a 4.7Gb DVD using Nero? I tried to burn the image burned it successfully but after checking the MD5SUM, SHA1SUM , SHA256SUM and SHA512SUM of the DVD I found different from the normal kali iso but the ISO kali-linux-1.0.6-i386.iso is 100% healthy I checked the previous mentioned SUMs and found it clean but not the DVD than I tried to extract the ISO of the DVD I found a the same SUMs as the DVD but different from the original ISO image, i checked also my kali-linux-1.0.5-i386 DVD found it 100% healthy but not kali-linux-1.0.6-i386 so what's the best speed of burning kali-linux-1.0.6-i386.iso on a DVD?
Thank you for your answers

Generally, the slower the better to avoid errors. When data does not completely fill the disk, 0s are typically used to fill the remaining space. This would alter checksums between ISO file and burned disc. The individual file checksums should still match, though. Try to verify the individual files by checksum, rather than the entire ISO. Typically, this is what burning programs do for you, when you enable disk verification.