Determine if ISO will fit on DVD+R?

[Sizzlechest]

Is there an algorithm I can use to determine if the contents of an ISO file will fit on a DVD+R? Checking the overall file size would be easy, but I do worry about edge cases where it's borderline. Are there any existing utilities that do this from the command line?

Edited July 17, 2018 by Sizzlechest

[LIGHTNING UK!]

There's a specific number of sectors available on the disc. Each sector is 2048 bytes in size, so you can do it by file size alone.

[Sizzlechest]

That's good to know. So I assume the ISO file format has no additional headers or padding? It's a "raw" file format?

[dbminter]

Also, why not just load the ISO in ImgBurn?  It should surely tell you if the ISO won't fit the DVD+R you have inserted into your drive.  It should either deny it or ask if you want to overburn it, which would tell you it won't fit on the DVD+R at its current size without overburn.  So, it's, at least, slightly larger than the DVD+R size.

[LIGHTNING UK!]

Correct, no headers or padding.

[Sizzlechest]

Also, why not just load the ISO in ImgBurn?  It should surely tell you if the ISO won't fit the DVD+R you have inserted into your drive.  It should either deny it or ask if you want to overburn it, which would tell you it won't fit on the DVD+R at its current size without overburn.  So, it's, at least, slightly larger than the DVD+R size.

 

Because I am scripting a dvd robot handler and I want to check the iso so I can load the correct disc (DVD-R vs DVD+R DL) into the burner.

Edited July 17, 2018 by Sizzlechest

[dbminter]

Ah, I see.  You're writing your own script.  So, you'd want to know how to "manually" determine this.