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Re: How to create a proper size UDF image?

Hi Jörg,

>> I know that some tools like mkisofs could make files to a udf image directly with efficient size. However the size created by mkisofs could be larger than the media size. What's more, the udf filesystem made by mkisofs is a UDF hybrid and not a UDF only filesystem.  

> Why do you have a problem with a hybrid?
> This usually does not increase the size in a way that is relevant.

I once used mkisofs but it did not support uid and gid. Now I update it to the latest version (3.02a09),  this problem is resolved. 

But I find the Chinese characters (UTF-8 charset) are not supported very well. The commands I used are the following. 
root@Ubuntu:~# ls long-name/
... ...
root@Ubuntu:~# /opt/schily/bin/mkisofs -UDF -o a.udf ./long-name
Setting input-charset to 'UTF-8' from locale.
Total translation table size: 0
Total rockridge attributes bytes: 0
Total directory bytes: 0
Path table size(bytes): 10
Max brk space used 0
507 extents written (0 MB)

root@Ubuntu:~# mount ./a.udf /mnt                               
mount:块设备 /root/a.udf 写保护,将以只读方式挂载

root@Ubuntu:~# ls /mnt

We can see that some filenames cannot be read correctly.

>> So is there a rational method to get the rough size of a UDF image file to be created if we know the directory tree and sizes of files needed to be burned? I think 10% larger size  overhead could be acceptable.

> I recommend to use mkisofs, as this creates a proper readonly UDF.

> mkisofs -UDF -print-size

> gives you the size.

Well that's what I want. It's really useful feature. Does it count the size of entries? I mean that one directory may have thousands small files. The directory's entry size cannot be negligible. 


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