virtual hard drive footer format

vhd.h

// http://download.microsoft.com/download/f/f/e/ffef50a5-07dd-4cf8-aaa3-442c0673a029/Virtual%20Hard%20Disk%20Format%20Spec_10_18_06.doc

// footer lives at end of the file - 512/511 bytes

struct vhd_footer_t {

  // "conectix"
  uint64_t cookie;

  // 0  - No features enabled
  // 1  - Temporary
  // 2  - Reserved
  uint32_t features;

  // should be 0x00010000
  uint32_t version;

  // 0xFFFFFFFF for fixed disks
  uint64_t offset;
  uint32_t timestamp;

  // "vs  "  - virtual server
  // "vpc "  - virtual pc
  uint32_t creat_app;
  uint32_t creat_ver;
  uint32_t creat_os;
  uint64_t orig_size;

  // size of hard drive in bytes
  uint64_t size;

  // byte 0-1  - cylinders
  // byte 2    - heads
  // byte 3    - sectors
  uint32_t geometry;

  // 2  - fixed disk
  uint32_t type;

  // inverted sum of hard disk footer bytes (without checksum)
  uint32_t checksum;
  uint8_t  uuid[16];
  uint8_t  state;

  // should be 427 bytes reserved after this
};