To dump GC DVD you need mod-chipped GC and Broad-Band Adapter (BBA). Then you must use option in your shell to "backup" disk. Usually shell asks you to insert original disk and get backup from http://192.168.1.32/backup.iso
After you get backup, you can use HashCalc (www.slavasoft.com/hashcalc/index.htm) to calculate MD5, SHA1, CRC32 and eMule checksums.
GC disk ID is placed on the disk itself (not on back-side of box cover). Example disk ID is DL-DOL-GWRP-EUR.
Game version is written at offset +7 from beginning of the dump (one byte). 0x00 mean v1.00, 0x01 mean v1.01 etc.
DOL MD5 is need for better recognition of disk versions.
Dont use this: You can extract DOL by GCTool 1.2 from menu Tools -> Extract DOL..
See the next post.
Disk size is always 1.459.978.240 bytes.