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SD card partitioning using sfdisk

Thiru N
Intellectual 330 points

hi All,

I'm working on BeagleBone black. I want understand how the SD card is partitioned using create-sdcard.sh which is part of TI SDK

SIZE=`fdisk -l $DRIVE | grep Disk | awk '{print $5}'`
 509
 510 echo DISK SIZE - $SIZE bytes
 511
 512 CYLINDERS=`echo $SIZE/255/63/512 | bc`

sfdisk -D -H 255 -S 63 -C $CYLINDERS $DRIVE << EOF
  ,9,0x0C,*  
  10,90,,-
  100,,,-
  EOF

what ,9,0x0C,* represents ? and 10,90,,- ?

Please explain the what is the meaning of each line or suggest me any link or doc which explains each line item

Regards,

Thiru N