Difference between SIZE and IMAGE SIZE

[philbilldick]

Would really like to know how to calculate IMAGE SIZE so I can decide whether I need a Single or Dual disc.

 

Logs is

 

I 11:31:48 ImgBurn Version 2.4.4.0 started!

I 11:31:48 Microsoft Windows XP Professional (5.1, Build 2600 : Service Pack 3)

I 11:31:48 Total Physical Memory: 3,143,520 KB - Available: 2,339,840 KB

I 11:31:48 Initialising SPTI...

I 11:31:48 Searching for SCSI / ATAPI devices...

I 11:31:48 Found 1 DVD-ROM and 1 DVD

[rasheed]

Size means size of all the files that you included in the image.

Image size means size of the image itself, which includes all files + filesystem data structures + rounded to multiple of 2048 bytes, which is the size of the physical sector on cds / dvds.

 

Btw, in build mode, if you press the button with calculator on it, ImgBurn will tell you what is the minimum required media.

[LIGHTNING UK!]

Click the 'Calculate' button and read it off the 'Information' tab?

 

The 'Size' one is just the file sizes combined.

 

You can't calculate 'Image Size' yourself, it also has to take into account the size of the file system and any additional padding - both of which are only really known to ImgBurn (and are of course variable).

 

EDIT: Damn, too late because someone rang in the middle!

[philbilldick]

Thanks so far.....

 

I can see the following

(All 8 files have addition buffers to bring them to 2048 multiples)

 

Bytes Difference

Size 3,706,789,888

Size on disk 3,706,806,272 16,384

 

System files like TOC and buffering

 

Image File 3,707,404,288 598,016

 

Its the System files and buffering bit I want to calculate

[rasheed]

Thanks so far.....

 

I can see the following

(All 8 files have addition buffers to bring them to 2048 multiples)

 

Bytes Difference

Size 3,706,789,888

Size on disk 3,706,806,272 16,384

 

System files like TOC and buffering

 

Image File 3,707,404,288 598,016

 

Its the System files and buffering bit I want to calculate

I'm afraid you can't do that. Different file systems need different amounts of data. For example, disc with ISO 9660 only file system will have different size than a disc with UDF file system on it, also, file names are encoded differently, so, without all that data, you won't be able to calculate image size correctly.

 

Note that "Size on disk" information given by Windows is in multiple of file system's allocation units, which, for NTFS disks, vary in size, but generally are 4096 bytes (4 KB).

 

Anyway, if you want to do it, you will need to read all the specs about disc layouts and file systems.