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Foto pieklājīgi no Luca Colli (Flickr).
Jautājums
SuperUser lasītājs Mega vēlas zināt, vai ir veids, kā pateikt, vai divi DVD ir vienādi vai ne:
I have two DVDs and if I open the them, then copy the contents to my hard-drive to compare the respective files, it shows no difference. As far as I know, DVDs also have some additional content (such as information saying if the DVD is bootable along with some formatting information I guess).
How can I also check this additional content? Is it possible without additional programs on Windows or Ubuntu?
Vai ir kādas metodes, ko persona varētu izmantot, lai pārbaudītu, vai divi DVD ir identiski vai ne?
Atbilde
SuperUser atbalstītāji mtak un Dithermaster ir atbilde mums. Pirmais uz augšu, mtak:
The easiest way to determine if two discs are the same is to run a hash of both of them:
sudo md5sum /dev/cdrom
If the hashes match, then the disks are exactly the same. However, if the hashes do not match, then this will not tell you what is different about them. If even a single bit is different, you will get a totally different hash.
You can check the partition table of a disc with fdisk:
sudo fdisk -l /dev/cdrom
Seko Ditermastera atbilde:
Just comparing folders and files misses other things about the disc. If you create an.ISO image file from each disc and byte compare them, you would have a better idea if the discs are really the same or not.
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