brion@lightyear:~/Downloads/rockbox$ dd if=/dev/sda of=mbr.bin count=1
1+0 records in
1+0 records out
512 bytes transferred in 0.004728 seconds (108289 bytes/sec)

brion@lightyear:~/Downloads/rockbox$ dd if=/dev/sda1 of=bootpartition.bin
62+0 records in
62+0 records out
31744 bytes transferred in 0.005097 seconds (6228084 bytes/sec)

brion@lightyear:~/Downloads/rockbox$ ls -lah
total 216K
drwxr-xr-x   2 brion brion 4.0K 2006-04-27 21:18 .
drwxr-xr-x  18 brion brion 8.0K 2006-04-27 21:18 ..
-rw-r--r--   1 brion brion   40 2006-04-27 21:09 apple_os.bin
-rw-r--r--   1 brion brion  52K 2006-04-27 21:08 bootloader-nano.bin
-rw-r--r--   1 brion brion  31K 2006-04-27 23:31 bootpartition.bin
-rwxr-xr-x   1 brion brion  22K 2006-04-27 20:51 ipod_fw
-rw-r--r--   1 brion brion  15K 2006-04-27 20:50 ipod_fw.c
-rw-r--r--   1 brion brion  512 2006-04-27 23:30 mbr.bin
-rw-r--r--   1 brion brion  512 2006-04-27 20:54 mbr-nano4gb.bin
-rw-r--r--   1 brion brion  70K 2006-04-27 21:14 rockboot.bin