I copy paste here some information from other forum.
How are defines harddisk sizes?
16MB: -size 512,63,16,32
32MB: -size 512,63,16,64
64MB: -size 512,63,16,128
128MB: -size 512,63,16,256
256MB image: -size 512,63,16,520
512MB image: -size 512,63,32,520
1GB image: -size 512,63,64,520
2GB image: -size 512,63,64,1023
300MB image: -size 512,63,16,600
Download
http://4pda.ru/forum/index.php?showtopic=636270&st=340