ISO image with many files and directories created with IMAPI2 is corrupted

Question

Hello,

I am doing a POC on using IMAPI2 to create ISO files on BD for archiving purposes of millions of small files and directories.

When I created a BD-R iso image from 350K directories and 350K files it worked fine and I was able to mount the image (using daemon tools) and access the files.

But when I created an image from a larger number of directories and files (560K dirs and 1 million files), after mounting the image I couldn't access the files and I got an error message saying the file may be corrupted. 

Are there any restrictions on the files or directories number on a BD-R Iso image?

Really need your help here...

Thanks

 

 

Answer 1

There are some restrictions imposed by the filesystem you choose; in particular, ISO-9660 is surprisingly restrictive on the depth of directories (8 max). 

I don't know the specific limits of UDF, but it wouldn't surprise me to discover that you've exceeded the number of files or directories, possibly as a consequence of maximum path length (1023 bytes in some versions).

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Answer 2

Hi,

The image I am trying to create is a BD-R UDF 2.5.

I am using test data with directory depth of 6 and short directory names and files, the maximum path lenght is less than 100 bytes.

I have tried validating the iso image with the 'philips UDF verifier' and the verfier exited on an error which implies that the resulting image created by the IMAPI2 is corrupted.

I have read several documents on UDF and from what I understand there is no limit on the files or directory numbers on an image.

Any idea why the IMAPI2 fails to create a valid image on my test (500K directories and 1 million files)?

Thanks

Tal