compatible format . Ventoy

Ventoy Information Format

Ventoy information is 512 bytes long and in the format as follows: (structure packed with 1 byte, integers are in little-endian)

     
             Offset 
             Len 
             Type 
             Name 
             Description 
        

     0  16  UUID   Signature UUID 
     Signature for the information, the hex value is 20207777772e76656e746f792e6e6574 

    
 16  1  UINT8   Check Sum 
     This value, when added to all other 511 bytes, results in the value 00h (using 8-bit addition calculations). 
 17  16  UUID   Disk GUID 
     GUID to uniquely identify the disk 
 33  8  UINT64   Disk Size 
     The disk size in bytes 
 41  2  UINT16   Disk Partition ID 
     The partition ID (begin with 1) which hold the iso file 
 43  2  UINT16   Partition Filesytem 
     The partition filesystem 
 0:exfat   1:ntfs   2:ext   3:xfs   4:udf   5:fat    other:reserved 
 45  384  STRING   ISO File Path 
     The full iso file path under the partition, ( begin with '/' ) 
 429  8  UINT64   ISO File Size 
     The iso file size in bytes 
 437  8  UINT64   ISO location info address 
     The phy memory address which contains iso file location information 
 445  4  UINT32   ISO location info length 
     The iso file location information length
 449  32  BYTES   Ventoy Reserved 
     Reserved by Ventoy
 481  4  BYTES   Disk Signature 
     Disk signature to uniquely identify the disk
 485  27  BYTES   Reserved 
     Reserved for future

Offset	Len	Type	Name	Description
0	16	UUID	Signature UUID	Signature for the information, the hex value is `20207777772e76656e746f792e6e6574`
16	1	UINT8	Check Sum	This value, when added to all other 511 bytes, results in the value 00h (using 8-bit addition calculations).
17	16	UUID	Disk GUID	GUID to uniquely identify the disk
33	8	UINT64	Disk Size	The disk size in bytes
41	2	UINT16	Disk Partition ID	The partition ID (begin with 1) which hold the iso file
43	2	UINT16	Partition Filesytem	The partition filesystem 0:exfat 1:ntfs 2:ext 3:xfs 4:udf 5:fat other:reserved
45	384	STRING	ISO File Path	The full iso file path under the partition, ( begin with '/' )
429	8	UINT64	ISO File Size	The iso file size in bytes
437	8	UINT64	ISO location info address	The phy memory address which contains iso file location information
445	4	UINT32	ISO location info length	The iso file location information length
449	32	BYTES	Ventoy Reserved	Reserved by Ventoy
481	4	BYTES	Disk Signature	Disk signature to uniquely identify the disk
485	27	BYTES	Reserved	Reserved for future

You can refer to struct ventoy_os_param defined in Ventoy's source code (ventoy.h).