Thinkpad Lover wrote:Isn't that similar to when IBM Record Now or a similar burning program of decent quality "Verifies" a disc after burning it? Also, if errors were found using your method, couldn't it be a defective CD or DVD disc and maybe not the DVD burner?
Yes, it is likely similar. Not everyone uses burning software with a "verify after write" option. For that reason, Debian discs have a checksum file and a checker-routine.
If you have bad media, I imagine would give a false negative with any testing method. So that is a benefit of RW media: if it is known good, you can keep on using it.
Thinkpad Lover wrote:In any case that's why I thought maybe burning a complete disc especially XP SP2 reinstallation CD or Windows 7 Pro reinstallation DVD and then checking by booting from that created disc in another laptop might be a more thorough method, which is what I'm done before. I've also used that disc I created to install XP on another laptop, which involves reading many detailed files.
A mere boot test only tells you that the parts relating to booting came out okay. In my experience, when a optical drive gets errors, it is usually in the far-out data. I think a Windows 7 DVD is only 2.5 Go or so, while a DVD can hold like 4.7 or so Go. So your Windows 7 test does not tell you how well the drive can access the outer sectors. Also, while installing Windows XP involves reading many detailed files, the Debian/Ubuntu installation discs check
every file.
Thinkpad Lover wrote:Likewise with Windows 7 Pro DVD's. I've never had a problem with a disc created successfully by IBM Record Now (and therefore the CD or DVD burner used). I would imagine error checking is built into the program.
It very well may be. But again, by burning Windows 7, you are only checking 3/5 or so of the capacity. And it is in the farther data that problems are more likely to emerge. A better test would be
debian-6.0.2.1-i386-DVD-1.iso … 4.67 Go in size, where a DVD holds 4.7 Go
Thinkpad Lover wrote:If not, is there a web site where I can download it?
There sure is, though BitTorrent is nicer, and more fault-tolerant.
For Debian torrent,
http://cdimage.debian.org/debian-cd/6.0 ... 86/bt-dvd/
For Ubuntu http,
http://cdimage.ubuntulinux.org/releases/11.04/release/
The Ubuntu DVD is just 4.2 Go or so; I would prefer to use a Debian DVD. They really pack 'em tight!
I'm no expert at this. Every day, I am learning how to use computers! In time, I hope someone will suggest a smart answer to this problem, a solution more elegant than downloading a whole DVD image.