Comment 3 for bug 1263181

ubuntu@scandium:~$ find /sys/block/
/sys/block/
/sys/block/ram0
/sys/block/ram1
/sys/block/ram2
/sys/block/ram3
/sys/block/ram4
/sys/block/ram5
/sys/block/ram6
/sys/block/ram7
/sys/block/ram8
/sys/block/ram9
/sys/block/ram10
/sys/block/ram11
/sys/block/ram12
/sys/block/ram13
/sys/block/ram14
/sys/block/ram15
/sys/block/loop0
/sys/block/loop1
/sys/block/loop2
/sys/block/loop3
/sys/block/loop4
/sys/block/loop5
/sys/block/loop6
/sys/block/loop7
/sys/block/fd0
/sys/block/cciss!c0d0
/sys/block/sr0

And, in case it's useful:

$ cat /proc/partitions
major minor #blocks name

 104 0 430110072 cciss/c0d0
 104 1 421892096 cciss/c0d0p1
 104 2 1 cciss/c0d0p2
 104 5 8215552 cciss/c0d0p5
  11 0 1048575 sr0