HDD signature layout (aka HDDSS.BIN)
Address Length (bytes) Contains
0x0000 8192 Null (0x00)
0x2000 20 Serial number (padded with spaces)
0x2020 8 Firmware revision (padded with spaces)
0x2028 40 Manufacturer and Model number (padded with spaces)
0x2044 20 SHA-1 (160 bit) digest of microsoft logo data (present between 0x2200 - 0x2E00, doesn't change console to console)
0x2058 4 LBA Sector Size, known values:
20GB 0x80295402 = 39.070.080
60GB 0x807CFC06 = 117.210.240
80GB 0x90FC5109 = 156.368.016
120GB 0xB04BF90D = 234.441.648
250GB 0x70591C1D = 488.397.168
0x205C 256 Dynamic Binary Data (an encrypted version of a digest over the first 92 bytes of this data? this would be encrypted with a private key that only MS knows)
0x2202 2 Size of following PNG file
0x2204 2754 MS logo in PNG format, made with Macromedia Fireworks MX 2004 on the 19th of July 2005