compatible format . Ventoy

Ventoy 运行时参数格式

Ventoy 参数长度为 512 字节。具体结构如下: (结构1字节对齐，整数为小字节序)

    
             Offset 
             Len 
             Type 
             Name 
             Description 
        
             0  16  UUID   Signature UUID 
             Signature for this 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. 

                注意：这个GUID不是GPT磁盘的GUID的概念，而是Ventoy在创建分区的时候自己写入的一个16字节的UUID。写入的位置在U盘第一个512扇区中的偏移 384 开始处。
                MBR/GPT分区格式都会写入，位置相同，可以使用这个UUID代替Disk Signature来精确定位磁盘。
            
  33  8  UINT64   Disk Size 
             The disk size in bytes. 

                注意：这个size是在grub阶段获取到的，特殊情况下可能和启动进入系统后获取到的不一致，因此不建议作为严格检查项目。
             
             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 '/' ) (UTF-8 encode) 
        
  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. 

                U盘第一个512扇区偏移 440 开始的4字节数据。

  485  27  BYTES   Reserved 
             Reserved for future

Offset	Len	Type	Name	Description
0	16	UUID	Signature UUID	Signature for this 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. 注意：这个GUID不是GPT磁盘的GUID的概念，而是Ventoy在创建分区的时候自己写入的一个16字节的UUID。写入的位置在U盘第一个512扇区中的偏移 384 开始处。 MBR/GPT分区格式都会写入，位置相同，可以使用这个UUID代替Disk Signature来精确定位磁盘。
33	8	UINT64	Disk Size	The disk size in bytes. 注意：这个size是在grub阶段获取到的，特殊情况下可能和启动进入系统后获取到的不一致，因此不建议作为严格检查项目。
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 '/' ) (UTF-8 encode)
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. U盘第一个512扇区偏移 440 开始的4字节数据。
485	27	BYTES	Reserved	Reserved for future

具体可以参考 Ventoy 源码中 struct ventoy_os_param 的定义。(ventoy.h)