Problem backing up library to DVD - disk not recognised

Hi all,
I have just tried to back up my iTunes library (approx. 7000 songs) to Sony DVD-R (for General Version 2.1 / 16X-Speed DVD-R Revision 6.0, 7 DVDs in total).
There didn't seem to be any problem with the burning process - I am using an HP Pavilion laptop (bought in 2005) with DVD R/RW.
When the backup was complete, I tried inserting the first DVD to check it had worked - however, nothing was recognised by iTunes (latest version - 7.3.2) and when I looked at the disc in Windows Explorer it appeared to be empty.
However, there was no indication when I was burning the files that there was a problem - it seemed to work perfectly.
Should I try a different brand of DVD? I tried to burn some pictures to the same kind of disk, through Windows XP, and it did not work, so it may well be that the brand of DVD is not compatible with my laptop.
I am also considering backing up using an external hard drive - is this a reliable method? Is it just a case of copying my iTunes folder over to the external drive?
Also, would it be a good idea to copy to an external drive in stages, to avoid corrupting files, or could I do it in one single step?
There is no problem with my laptop (yet!), but I am keen to back this library up as I know how quickly things can change with computers!
Many thanks for any help.

See this User Tip.
tt2

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markfitz59 wrote:
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The laptop cd/dvd drive is not recognising any cd/dvd's I insert. The cd/dvd's that I do insert also do not seem to fit neatly into the drive.
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Problem backing up library to DVD - disk not recognised

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