How can I extract udf blu-ray iso with fast speed? It seems like rar and 7z can't read the file format. I know that you can mount it and then copy the files, but it's terribly slow for me (10MB/s on a drive with 125MB/s speed), which is also the reason why I can't use it directly (have to wait to buffer every 2-5 seconds).

  • Is the image perhaps residing on the same disk you’re trying to copy its contents to? Is this a HDD (“spinning rust”)?
    – Daniel B
    Nov 28, 2020 at 12:33
  • @DanielB No. I tried copying to another disk. This is a HDD disk.
    – Joy Jin
    Dec 19, 2020 at 7:29

1 Answer 1


There is only ONE valid answer:


Please search for a download on some trusted tech site of yours. I remember sourceforge putting unwanted stuff into their downloads.

It's Open-Source and available for Linux as for Windows. If you want, you can even create a backup of the filesystem structure. Most of times, the data might be flawless, but you don't get them displayed, because of errors in the file system.

  • It might be worth talking about what OSes this supports, where to find this application and how to use it
    – Journeyman Geek
    Jul 4, 2021 at 4:11
  • Oh sorry. I already migrated to Linux a long time, ago. For me all StackExchange sites - i use - are bout Linux. :)
    – WGRM
    Jul 4, 2021 at 4:19

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