Certain files consistently not being read from DVD

jelman · 11-04-2009, 03:29 PM

Hello all,

I have been running into a problem when trying to copy dicom files (from an MRI scanner) off of DVD to our computer running RHEL 5.3. Within each folder, the 12th, 27th and then every 14th file after that are not showing up when I browse the disc. Additionally, some folders themselves are not present. Trying ls -a and viewing hidden files doesn't seem to help. However, these files ARE on the dvd as I can view them on a PC and Mac. When transferred from dvd to usb drive on these computers, I am able to load them onto the linux machine.

There doesn't seem to be any reason why these files should be treated differently as each one should contain very similar data. Any ideas would be much appreciated, let me know if I should provide more info though.

Thanks for your help,
Jeremy

chiragrk · 11-04-2009, 05:51 PM

How are you copying the contents of the DVD, using file manager? Although I'm not sure why your method is failing, there are other options I would try.

The command line option (cp -R /mount/point/ofdvd /your/home)?

Also you can try to copy over the DVD to an iso file like this:
dd if=/dev/dvd0 of=/root/dicom1.iso

Check the contents of the DVD copy
mount -o loop /root/dicom1.iso /mnt
cd /mnt

jelman · 11-04-2009, 06:57 PM

Thanks for the quick reply!

I tried the command line copy and had the same problem. However, when I copied the disc to iso, it did successfully copy all files. Any reason why it would detect these files during that operation but not with the file browser or listing/copying through the command line?

Thanks again for your help,
Jeremy

chiragrk · 11-05-2009, 05:17 AM

I'm not 100% sure, but my best guess would be that the DVD has some bad sectors & the programs in Mac and PC are resilient enough to recover out of them while the program in Linux isn't.
In the past I've had scratched CDs/DVDs which got read on Windows but not on RHEL.

jelman · 11-05-2009, 01:36 PM

Hmm, maybe I'll try loading it onto another linux machine to see if similar problems are occurring on different distributions. It is strange that it's such a consistent problem on every DVD we burn (about 20 so far). Maybe a problem with the computer burning the discs? Either way, thank you for helping, much appreciated!