vcd, .dat files and isofs problem

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I have problems reading the .dat files from VCD, here is the kernel logs. I think it is an fs issue, since I am not the only one having the same problem. In user space, read returns I/O error but I think it is an fs issue or a cd-rom driver issue, I have tested with xine vcd player, the vcd can be played by directly accessing the block device but not through the fs. I tested the VCD under MS Windows using the same machine and disc and .dat files can be correctly read, even I use vcdgear win32 to convert the .dat file to .mpg it is still fine. So it is sure it is not the CD or hardware problem.

Many VCD's are tested and result is the same. It is likely to be an fs specific problem. I am running 2.4.17 and lsmod shows isofs is in use. Here is my log messages.

kernel: hdd: command error: error=0x55
kernel: end_request: I/O error, dev 16:40 (hdd), sector 32300
[...]

vcd, .dat files and isofs problem

> same problem. In user space, read returns I/O error but I think it is an
> fs issue or a cd-rom

VCD .dat files are not normal "files". They are encoded in a different mode to get more bytes/sector at the cost of lower error resistance (mpeg is error resistant in itself…)

Alan

vcd, .dat files and isofs problem

> same problem. In user space, read returns I/O error but I think it is an
> fs issue or a cd-rom

Have a look at cdfs: http://www.elis.rug.ac.be/~ronsse/cdfs/

It will allow you to read those files. Of course, there are also userland utilities for that. Just search freshmeat for vcd.

cdfs-src - shows the tracks on a CD as normal files
vcdtools - Creates Video CD (VCD) filesystem images